TW201900446A - Bicycle rear hub assembly - Google Patents

Bicycle rear hub assembly Download PDF

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Publication number
TW201900446A
TW201900446A TW107116092A TW107116092A TW201900446A TW 201900446 A TW201900446 A TW 201900446A TW 107116092 A TW107116092 A TW 107116092A TW 107116092 A TW107116092 A TW 107116092A TW 201900446 A TW201900446 A TW 201900446A
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TW
Taiwan
Prior art keywords
sprocket
bicycle rear
hub assembly
rear hub
external spline
Prior art date
Application number
TW107116092A
Other languages
Chinese (zh)
Other versions
TWI786113B (en
Inventor
岡智成
Original Assignee
日商島野股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US15/608,924 external-priority patent/US11332213B2/en
Priority claimed from US15/608,915 external-priority patent/US11059541B2/en
Priority claimed from US15/673,346 external-priority patent/US10377174B2/en
Priority claimed from US15/686,179 external-priority patent/US11220309B2/en
Priority claimed from US15/686,177 external-priority patent/US11179967B2/en
Priority claimed from US15/851,781 external-priority patent/US10946931B2/en
Priority claimed from US15/851,785 external-priority patent/US10752320B2/en
Application filed by 日商島野股份有限公司 filed Critical 日商島野股份有限公司
Publication of TW201900446A publication Critical patent/TW201900446A/en
Application granted granted Critical
Publication of TWI786113B publication Critical patent/TWI786113B/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/02—Hubs adapted to be rotatably arranged on axle
    • B60B27/04—Hubs adapted to be rotatably arranged on axle housing driving means, e.g. sprockets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/30—Chain-wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/02—Hubs adapted to be rotatably arranged on axle
    • B60B27/023—Hubs adapted to be rotatably arranged on axle specially adapted for bicycles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/02—Hubs adapted to be rotatably arranged on axle
    • B60B27/04—Hubs adapted to be rotatably arranged on axle housing driving means, e.g. sprockets
    • B60B27/047—Hubs adapted to be rotatably arranged on axle housing driving means, e.g. sprockets comprising a freewheel mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
    • B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
    • B62M9/10—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
    • B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
    • B62M9/10—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like
    • B62M9/12—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like the chain, belt, or the like being laterally shiftable, e.g. using a rear derailleur
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
    • B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
    • B62M9/10—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like
    • B62M9/12—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like the chain, belt, or the like being laterally shiftable, e.g. using a rear derailleur
    • B62M9/121—Rear derailleurs
    • B62M9/124—Mechanisms for shifting laterally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • B62M2009/005—Details of transmission chains specially adapted for bicycles

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Gears, Cams (AREA)
  • Transmissions By Endless Flexible Members (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Automatic Cycles, And Cycles In General (AREA)
  • Steering Devices For Bicycles And Motorcycles (AREA)
  • Axle Suspensions And Sidecars For Cycles (AREA)

Abstract

A bicycle rear hub assembly comprises a hub axle, a hub body, and a sprocket support body. The hub axle includes an axle through-bore that has a minimum inner diameter equal to or larger than 13 mm. The hub body is rotatably mounted on the hub axle about a rotational center axis of the bicycle rear hub assembly. The sprocket support body is rotatably mounted on the hub axle about the rotational center axis.

Description

自行車後輪轂總成Bicycle rear hub assembly

本發明係關於一種自行車後輪轂總成。The invention relates to a bicycle rear hub assembly.

騎車正變成更日益流行的消遣形式以及交通方式。此外，騎車已變為業餘及專業人員兩者的非常流行競技運動。不論自行車是用於消遣、交通抑或是用於競賽，自行車行業正不斷地改良自行車之各種組件。已經充分重新設計之一個自行車組件為輪轂總成。Bicycling is becoming a more popular pastime and mode of transportation. In addition, cycling has become a very popular competitive sport for both amateurs and professionals. Whether the bicycle is used for recreation, transportation or competition, the bicycle industry is constantly improving the various components of the bicycle. One bicycle component that has been fully redesigned is the wheel hub assembly.

根據本發明之一第一態樣，一種自行車後輪轂總成包含一輪轂軸、一輪轂主體及一鏈輪支撐主體。該輪轂軸包括具有等於或大於13 mm之一最小內徑的一軸通孔。該輪轂主體圍繞該自行車後輪轂總成之一旋轉中心軸線可旋轉地安裝於該輪轂軸上。該鏈輪支撐主體圍繞該旋轉中心軸線可旋轉地安裝於該輪轂軸上。 在根據第一態樣之自行車後輪轂總成之情況下，有可能提高後輪周圍之自行車傳動系統之強度，此係因為具有較大外徑之車輪緊固軸可安裝於自行車後輪轂總成之輪轂軸的軸通孔內。 根據本發明之一第二態樣，根據該第一態樣之自行車後輪轂總成經構形以使得：該軸通孔之該最小內徑等於或大於14 mm。 在根據第二態樣之自行車後輪轂總成之情況下，有可能進一步進一步提高後輪周圍之自行車傳動系統之強度，此係因為具有較大外徑之車輪緊固軸可安裝於自行車後輪轂總成之輪轂軸的軸通孔內。 根據本發明之一第三態樣，根據該第一態樣或該第二態樣之自行車後輪轂總成經構形以使得：該軸通孔之該最小內徑等於或小於21 mm。 在根據第三態樣之自行車後輪轂總成之情況下，有可能獲得鏈輪支撐主體與輪轂軸之間及輪轂主體與輪轂軸之間的必需內部空間，且藉此提高設計自行車後輪轂總成之自由度。 根據本發明之一第四態樣，根據該第一態樣至該第三態樣中任一項之自行車後輪轂總成經構形以使得：該輪轂軸具有等於或大於17 mm之一最大外徑。 在根據第四態樣之自行車後輪轂總成之情況下，有可能擴大輪轂軸之軸通孔的最小內徑，以使得提高後輪周圍之自行車傳動系統的強度。 根據本發明之一第五態樣，根據該第四態樣之自行車後輪轂總成經構形以使得：該輪轂軸之該最大外徑等於或大於20 mm。 在根據第五態樣之自行車後輪轂總成之情況下，有可能擴大輪轂軸之軸通孔的最小內徑，以使得提高後輪周圍之自行車傳動系統的強度。 根據本發明之一第六態樣，根據該第五態樣或該第五態樣之自行車後輪轂總成經構形以使得：該輪轂軸之該最大外徑等於或小於23 mm。 在根據第六態樣之自行車後輪轂總成之情況下，有可能獲得鏈輪支撐主體與輪轂軸之間及輪轂主體與輪轂軸之間的必需內部空間，且藉此提高設計自行車後輪轂總成之自由度。 根據本發明之一第七態樣，根據該第一態樣至該第六態樣中任一項之自行車後輪轂總成經構形以使得：該鏈輪支撐主體包括經構形以與一自行車後鏈輪總成嚙合之至少十個外部花鍵齒，該至少十個外部花鍵齒中之每一者具有一外部花鍵傳動表面及一外部花鍵非傳動表面。 在根據第七態樣之自行車後輪轂總成之情況下，相比包括九個或更少外部花鍵齒之鏈輪支撐主體，至少十個外部花鍵齒減小施加至至少十個外部花鍵齒中之每一者的旋轉力。此提高鏈輪支撐主體之耐久性及/或提高挑選鏈輪支撐主體之材料的自由度而不降低鏈輪支撐主體之耐久性。 根據本發明之一第八態樣，根據該第七態樣之自行車後輪轂總成經構形以使得：該至少十個外部花鍵齒之一總數目等於或大於20。 在根據第八態樣之自行車後輪轂總成之情況下，有可能進一步提高鏈輪支撐主體之耐久性及/或進一步提高挑選鏈輪支撐主體之材料的自由度而不降低鏈輪支撐主體之耐久性。 根據本發明之一第九態樣，根據該第七態樣之自行車後輪轂總成經構形以使得：該至少十個外部花鍵齒之一總數目等於或大於25。 在根據第九態樣之自行車後輪轂總成之情況下，有可能進一步提高鏈輪支撐主體之耐久性及/或進一步提高挑選鏈輪支撐主體之材料的自由度而不降低鏈輪支撐主體之耐久性。 根據本發明之一第十態樣，根據該第七態樣之自行車後輪轂總成經構形以使得：該至少十個外部花鍵齒之一總數目等於或大於28。 在根據第十態樣之自行車後輪轂總成之情況下，有可能進一步提高鏈輪支撐主體之耐久性及/或進一步提高挑選鏈輪支撐主體之材料的自由度而不降低鏈輪支撐主體之耐久性。 根據本發明之一第十一態樣，根據該第七態樣至該第十態樣中任一項之自行車後輪轂總成經構形以使得：該至少十個外部花鍵齒中之至少一者具有等於或小於27 mm之一軸向花鍵齒長度。 在根據第十一態樣之自行車後輪轂總成之情況下，有可能減輕自行車後輪轂總成之重量。 根據本發明之一第十二態樣，根據該第十一態樣之自行車後輪轂總成經構形以使得：該軸向花鍵齒長度等於或大於22 mm。 在根據第十二態樣之自行車後輪轂總成之情況下，有可能提高自行車後鏈輪總成之速度級別。 根據本發明之一第十三態樣，根據該第七態樣至該第十二態樣中任一項之自行車後輪轂總成經構形以使得：該至少十個外部花鍵齒具有一第一外部周節角及不同於該第一外部周節角之一第二外部周節角。 在根據第十三態樣之自行車後輪轂總成之情況下，有可能易於在正確圓周位置中將自行車後鏈輪總成附接至自行車後輪轂總成。 根據本發明之一第十四態樣，根據該第七態樣至該第十三態樣中任一項之自行車後輪轂總成經構形以使得：該至少十個外部花鍵齒中之至少兩個外部花鍵齒相對於該旋轉中心軸線按一第一外部周節角沿圓周配置。該第一外部周節角範圍介於5度至36度。 在根據第十四態樣之自行車後輪轂總成之情況下，有可能進一步提高鏈輪支撐主體之耐久性及/或進一步提高挑選鏈輪支撐主體之材料的自由度而不降低鏈輪支撐主體之耐久性。 根據本發明之一第十五態樣，根據該第十四態樣之自行車後輪轂總成經構形以使得：該第一外部周節角範圍介於10度至20度。 在根據第十五態樣之自行車後輪轂總成之情況下，有可能進一步提高鏈輪支撐主體之耐久性及/或進一步提高挑選鏈輪支撐主體之材料的自由度而不降低鏈輪支撐主體之耐久性。 根據本發明之一第十六態樣，根據該第十五態樣之自行車後輪轂總成經構形以使得：該第一外部周節角等於或小於15度。 在根據第十六態樣之自行車後輪轂總成之情況下，有可能進一步提高鏈輪支撐主體之耐久性及/或進一步提高挑選鏈輪支撐主體之材料的自由度而不降低鏈輪支撐主體之耐久性。 根據本發明之一第十七態樣，根據該第一態樣至該第十六態樣中任一項之自行車後輪轂總成經構形以使得：該鏈輪支撐主體包括經構形以與一自行車後鏈輪總成嚙合之至少一個外部花鍵齒。該至少一個外部花鍵齒具有等於或小於34 mm之一外部花鍵頂徑。 在根據第十七態樣之自行車後輪轂總成之情況下，有可能減輕自行車後輪轂總成之重量。 根據本發明之一第十八態樣，根據該第十七態樣之自行車後輪轂總成經構形以使得：該外部花鍵頂徑等於或小於33 mm。 在根據第十八態樣之自行車後輪轂總成之情況下，有可能進一步減輕自行車後輪轂總成之重量。 根據本發明之一第十九態樣，根據該第十七態樣之自行車後輪轂總成經構形以使得：該外部花鍵頂徑等於或大於29 mm。 在根據第十九態樣之自行車後輪轂總成之情況下，有可能確保鏈輪支撐主體之強度。 根據本發明之一第二十態樣，根據該第一態樣至該第十九態樣中任一項之自行車後輪轂總成經構形以使得：該鏈輪支撐主體包括經構形以與一自行車後鏈輪總成嚙合之至少一個外部花鍵齒。該至少一個外部花鍵齒具有等於或小於32 mm之一外部花鍵底徑。 在根據第二十態樣之自行車後輪轂總成之情況下，外部花鍵底徑可增大至少一個外部花鍵齒之傳動表面的徑向長度。此提高鏈輪支撐主體之強度。 根據本發明之一第二十一態樣，根據該第二十態樣之自行車後輪轂總成經構形以使得：該外部花鍵底徑等於或小於31 mm。 在根據第二十一態樣之自行車後輪轂總成之情況下，外部花鍵底徑可增大至少一個外部花鍵齒之傳動表面的徑向長度。此提高鏈輪支撐主體之強度。 根據本發明之一第二十二態樣，根據該第二十態樣或該第二十一態樣之自行車後輪轂總成經構形以使得：該外部花鍵底徑等於或大於28 mm。 在根據第二十二態樣之自行車後輪轂總成之情況下，有可能確保鏈輪支撐主體之強度。 根據本發明之一第二十三態樣，根據該第一態樣至該第二十二態樣中任一項之自行車後輪轂總成經構形以使得：該鏈輪支撐主體包括經構形以與一自行車後鏈輪總成嚙合之至少一個外部花鍵齒。該至少一個外部花鍵齒包括複數個外部花鍵齒，該複數個外部花鍵齒包括複數個外部花鍵傳動表面以在踩踏期間接收來自該自行車後鏈輪總成之一傳動旋轉力。該複數個外部花鍵傳動表面各自包括一徑向最外邊緣、一徑向最內邊緣及自該徑向最外邊緣至該徑向最內邊緣界定之一徑向長度。該複數個外部花鍵傳動表面之該等徑向長度的一總和等於或大於7 mm。 在根據第二十三態樣之自行車後輪轂總成之情況下，有可能增大複數個外部花鍵傳動表面之徑向長度。此提高鏈輪支撐主體之強度。 根據本發明之一第二十四態樣，根據該第二十三態樣之自行車後輪轂總成經構形以使得：該等徑向長度之該總和等於或大於10 mm。 在根據第二十四態樣之自行車後輪轂總成之情況下，有可能進一步增大複數個外部花鍵傳動表面之徑向長度。此提高鏈輪支撐主體之強度。 根據本發明之一第二十五態樣，根據該第二十三態樣之自行車後輪轂總成經構形以使得：該等徑向長度之該總和等於或大於15 mm。 在根據第二十五態樣之自行車後輪轂總成之情況下，有可能進一步增大複數個外部花鍵傳動表面之徑向長度。此提高鏈輪支撐主體之強度。 根據本發明之一第二十六態樣，根據該第二十三態樣至該第二十五態樣中任一項之自行車後輪轂總成經構形以使得：該等徑向長度之該總和等於或小於36 mm。 在根據第二十六態樣之自行車後輪轂總成之情況下，有可能提高鏈輪支撐主體之生產率。 根據本發明之一第二十七態樣，根據該第一態樣至該第二十六態樣中任一項之自行車後輪轂總成經構形以使得：該輪轂主體包括：一第一輪輻安裝部分，其具有一第一軸向最外部分；一第二輪輻安裝部分，其具有一第二軸向最外部分；及一第一軸向長度，其相對於該自行車後鏈輪總成之該旋轉中心軸線在一軸向方向上界定於該第一輪輻安裝部分之該第一軸向最外部分與該第二輪輻安裝部分之該第二軸向最外部分之間。該第一軸向長度等於或大於55 mm。 在根據第二十七態樣之自行車後輪轂總成之情況下，第一軸向長度提高包括自行車後輪轂總成之車輪的強度。 根據本發明之一第二十八態樣，根據該第二十七態樣之自行車後輪轂總成經構形以使得：該第一軸向長度等於或大於60 mm。 在根據第二十八態樣之自行車後輪轂總成之情況下，第一軸向長度進一步提高包括自行車後輪轂總成之車輪的強度。 根據本發明之一第二十九態樣，根據該第二十七態樣之自行車後輪轂總成經構形以使得：該第一軸向長度等於或大於65 mm。 在根據第二十九態樣之自行車後輪轂總成之情況下，第一軸向長度進一步提高包括自行車後輪轂總成之車輪的強度。 根據本發明之一第三十態樣，根據該第一態樣至該第二十九態樣中任一項之自行車後輪轂總成經構形以使得：該輪轂軸包括一第一軸向框架鄰接表面、一第二軸向框架鄰接表面及一第二軸向長度。該第一軸向框架鄰接表面經構形以在該自行車後輪轂總成安裝至一自行車框架之一狀態下相對於該自行車後鏈輪總成之該旋轉中心軸線在一軸向方向上鄰接該自行車框架之一第一部分。該第二軸向框架鄰接表面經構形以在該自行車後輪轂總成安裝至該自行車框架之該狀態中在該軸向方向上鄰接該自行車框架之一第二部分。該第二軸向長度在該軸向方向上界定於該第一軸向框架鄰接表面與該第二軸向框架鄰接表面之間。該第二軸向長度等於或大於140 mm。 在根據第三十態樣之自行車後輪轂總成之情況下，第二軸向長度使得自行車後輪轂總成可附接至多種類型之自行車框架，同時獲得第一態樣之效果。 根據本發明之一第三十一態樣，根據該第三十態樣之自行車後輪轂總成經構形以使得：該第二軸向長度等於或大於145 mm。 在根據第三十一態樣之自行車後輪轂總成之情況下，第二軸向長度提高選擇第一軸向長度之自由度及/或達成自行車後鏈輪總成之更寬齒輪範圍。 根據本發明之一第三十二態樣，根據該第三十態樣之自行車後輪轂總成經構形以使得：該第二軸向長度等於或大於147 mm。 在根據第三十二態樣之自行車後輪轂總成之情況下，第二軸向長度提高選擇第一軸向長度之自由度及/或達成自行車後鏈輪總成之更寬齒輪範圍。 根據本發明之一第三十三態樣，根據該第一態樣至該第三十二態樣中任一項之自行車後輪轂總成進一步包含一自由輪結構。該自由輪結構包括：一第一棘輪構件，其包括至少一個第一棘輪齒；及一第二棘輪構件，其包括經構形以按一扭矩傳遞方式與該至少一個第一棘輪齒嚙合之至少一個第二棘輪齒。該第一棘輪構件經構形以按一扭矩傳遞方式與該輪轂主體及該鏈輪支撐主體中之一者嚙合。該第二棘輪構件經構形以按一扭矩傳遞方式與該輪轂主體及該鏈輪支撐主體中之另一者嚙合。該第一棘輪構件及該第二棘輪構件中之至少一者可在相對於該旋轉中心軸線之一軸向方向上相對於該輪轂軸移動。 在根據第三十三態樣之自行車後輪轂總成之情況下，有可能進一步提高自行車後輪轂總成之傳動效率且減輕自由輪結構之重量。 根據本發明之一第三十四態樣，根據該第三十三態樣之自行車後輪轂總成經構形以使得：該至少一個第一棘輪齒安置於該第一棘輪構件之一軸向表面上。該至少一個第二棘輪齒安置於該第二棘輪構件之一軸向表面上。該第二棘輪構件之該軸向表面面向該第一棘輪構件之該軸向表面。 在根據第三十四態樣之自行車後輪轂總成之情況下，有可能進一步提高自行車後輪轂總成之傳動效率且減輕自由輪結構之重量。 根據本發明之一第三十五態樣，根據該第三十三態樣或該第三十四態樣之自行車後輪轂總成經構形以使得：該鏈輪支撐主體具有具有一第一螺旋花鍵之一外周邊表面。該第一棘輪構件經構形以按一扭矩傳遞方式與該鏈輪支撐主體嚙合，且包括與該第一螺旋花鍵配合之一第二螺旋花鍵。 在根據第三十五態樣之自行車後輪轂總成之情況下，有可能平滑第一棘輪構件與第二棘輪構件之間的嚙合及/或脫嚙。 根據本發明之一第三十六態樣，根據該第三十五態樣之自行車後輪轂總成經構形以使得：該鏈輪支撐主體之該外周邊表面具有經構形以在惰轉期間朝向該輪轂主體導引該第一棘輪構件之一導引部分。 在根據第三十六態樣之自行車後輪轂總成之情況下，有可能減少在惰轉期間在自由輪結構中產生之噪聲。 根據本發明之一第三十七態樣，根據該第三十六態樣之自行車後輪轂總成經構形以使得：該導引部分在惰轉期間朝向該輪轂主體導引該第一棘輪構件以解除該至少一個第一棘輪齒與該至少一個第二棘輪齒之間的一嚙合。 在根據第三十七態樣之自行車後輪轂總成之情況下，有可能進一步減少在惰轉期間在自由輪結構中產生之噪聲。 根據本發明之一第三十八態樣，根據該第三十六態樣或該第三十七態樣之自行車後輪轂總成經構形以使得：該導引部分在相對於該鏈輪支撐主體之至少一圓周方向上延伸。 在根據第三十八態樣之自行車後輪轂總成之情況下，有可能進一步減少在惰轉期間在自由輪結構中產生之噪聲。 根據本發明之一第三十九態樣，根據該第三十六態樣至該第三十八態樣中任一項之自行車後輪轂總成經構形以使得：該導引部分經配置以與該第一螺旋花鍵界定一鈍角。 在根據第三十九態樣之自行車後輪轂總成之情況下，有可能進一步減少在惰轉期間在自由輪結構中產生之噪聲。 根據本發明之一第四十態樣，根據該第三十三態樣至該第三十九態樣中任一項之自行車後輪轂總成經構形以使得：該第一棘輪構件及該第二棘輪構件中之每一者具有一環狀形狀。 在根據第四十態樣之自行車後輪轂總成之情況下，有可能進一步提高自行車後輪轂總成之傳動效率且減輕自由輪結構之重量。 根據本發明之一第四十一態樣，根據該第一態樣至該第四十態樣中任一項之自行車後輪轂總成進一步包含：一制動轉子支撐主體，其包括經構形以與一自行車制動轉子嚙合之至少一個額外外部花鍵齒。該至少一個額外外部花鍵齒具有大於該外部花鍵頂徑之一額外外部花鍵頂徑。 在根據第四十一態樣之自行車後輪轂總成之情況下，制動轉子支撐主體提高制動效能，同時加寬安裝至自行車後輪轂總成之自行車後鏈輪總成的齒輪範圍，同時獲得第一態樣之效果。制動轉子支撐主體亦提高自行車制動轉子之附接及脫離屬性。 根據本發明之一第四十二態樣，根據該第七態樣至該第十六態樣中任一項之自行車後輪轂總成經構形以使得：該至少十個外部花鍵齒中之至少一者相對於一參考線沿圓周對稱，該參考線相對於該旋轉中心軸線在一徑向方向上自該旋轉中心軸線延伸至該至少十個外部花鍵齒中之該至少一者之一徑向最外端的一圓周中心點。 在根據第四十二態樣之自行車後輪轂總成之情況下，有可能提高鏈輪支撐主體之生產率。 根據本發明之一第四十三態樣，根據該第四十二態樣之自行車後輪轂總成經構形以使得：該複數個外部花鍵傳動表面中之至少一個表面具有界定於該外部花鍵傳動表面與一第一徑向線之間的一第一外部花鍵表面角，該第一徑向線自該自行車後輪轂總成之一旋轉中心軸線延伸至該外部花鍵傳動表面之一徑向最外邊緣。該第一外部花鍵表面角等於或小於6度。 在根據第四十三態樣之自行車後輪轂總成之情況下，有可能提高外部花鍵傳動表面之強度。 根據本發明之一第四十四態樣，根據該第四十二態樣或該第四十三態樣之自行車後輪轂總成經構形以使得：該等外部花鍵非傳動表面中之至少一者具有界定於該外部花鍵非傳動表面與一第二徑向線之間的一第二外部花鍵表面角，該第二徑向線自該自行車後輪轂總成之該旋轉中心軸線延伸至該外部花鍵非傳動表面之一徑向最外邊緣。該第二外部花鍵表面角等於或小於6度。 在根據第四十四態樣之自行車後輪轂總成之情況下，由於外部花鍵傳動表面與外部花鍵非傳動表面之間的對稱構形，有可能提高自行車後鏈輪總成之生產率。 根據本發明之一四十五態樣，一種自行車後輪轂總成包含一輪轂軸、一輪轂主體及一鏈輪支撐主體。該輪轂主體圍繞該自行車後輪轂總成之一旋轉中心軸線可旋轉地安裝於該輪轂軸上。該鏈輪支撐主體圍繞該旋轉中心軸線可旋轉地安裝於該輪轂軸上。該鏈輪支撐主體包括經構形以與一自行車後鏈輪總成嚙合之至少十個外部花鍵齒。該至少十個外部花鍵齒中之每一者具有一外部花鍵傳動表面及一外部花鍵非傳動表面。該至少十個外部花鍵齒中之至少一者相對於一參考線沿圓周對稱，該參考線相對於該旋轉中心軸線在一徑向方向上自該旋轉中心軸線延伸至該至少十個外部花鍵齒中之該至少一者之一徑向最外端的一圓周中心點。 在根據第四十五態樣之自行車後輪轂總成之情況下，相比包括九個或更少外部花鍵齒之鏈輪支撐主體，至少十個外部花鍵齒減小施加至至少十個外部花鍵齒中之每一者的旋轉力。此提高鏈輪支撐主體之耐久性及/或提高挑選鏈輪支撐主體之材料的自由度而不降低鏈輪支撐主體之耐久性。此外，對稱形狀提高鏈輪支撐主體之生產率。本發明之第四十五態樣可與第一態樣至第四十四態樣中之任一者組合。 根據本發明之一第四十六態樣，根據該第四十五態樣之自行車後輪轂總成經構形以使得：該至少十個外部花鍵齒之一總數目等於或大於28。 在根據第四十六態樣之自行車後輪轂總成之情況下，有可能提高鏈輪支撐主體之耐久性及/或提高挑選鏈輪支撐主體之材料的自由度而不降低鏈輪支撐主體之耐久性。 根據本發明之一第四十七態樣，根據該第四十五態樣或該第四十六態樣之自行車後輪轂總成經構形以使得：該等外部花鍵傳動表面中之至少一個表面具有界定於該外部花鍵傳動表面與一第一徑向線之間的一第一外部花鍵表面角，該第一徑向線自該自行車後輪轂總成之一旋轉中心軸線延伸至該外部花鍵傳動表面之一徑向最外邊緣。該第一外部花鍵表面角等於或小於6度。 在根據第四十七態樣之自行車後輪轂總成之情況下，有可能提高外部花鍵傳動表面之強度。 根據本發明之一第四十八態樣，根據該第四十七態樣之自行車後輪轂總成經構形以使得：該等外部花鍵非傳動表面中之至少一者具有界定於該外部花鍵非傳動表面與一第二徑向線之間的一第二外部花鍵表面角，該第二徑向線自該自行車後輪轂總成之該旋轉中心軸線延伸至該外部花鍵非傳動表面之一徑向最外邊緣。該第二外部花鍵表面角等於或小於6度。 在根據第四十八態樣之自行車後輪轂總成之情況下，由於外部花鍵傳動表面與外部花鍵非傳動表面之間的對稱構形，有可能提高自行車後鏈輪總成之生產率。 根據本發明之一第四十九態樣，根據該四十五態樣至該第四十八態樣中任一項之自行車後輪轂總成經構形以使得：該至少十個外部花鍵齒中之至少一者具有等於或小於27 mm之一軸向花鍵齒長度。 在根據第四十九態樣之自行車後輪轂總成之情況下，有可能減輕鏈輪支撐主體之重量。 根據本發明之一第五十態樣，根據該第七態樣至該第十態樣中任一項之自行車後輪轂總成經構形以使得：該至少十個外部花鍵齒中之至少一者具有等於或小於27 mm之一軸向花鍵齒長度。 在根據第五十態樣之自行車後輪轂總成之情況下，有可能減輕鏈輪支撐主體之重量。 根據本發明之一五十一態樣，根據該第七態樣之自行車後輪轂總成經構形以使得：該至少十個外部花鍵齒之一總數目範圍介於22至24。 在根據第五十一態樣之自行車後輪轂總成之情況下，至少十個外部花鍵齒之總數目提高鏈輪支撐主體之耐久性，同時提高自行車後輪轂總成之生產率。 根據本發明之一第五十二態樣，根據該第十三態樣之自行車後輪轂總成經構形以使得：該第一外部周節角範圍介於13度至17度。該第二外部周節角範圍介於28度至32度。 在根據第五十二態樣之自行車後輪轂總成之情況下，有可能易於在正確圓周位置中將自行車後鏈輪總成附接至自行車後輪轂總成，同時提高鏈輪支撐主體之耐久性及自行車後輪轂總成之生產率。 根據本發明之一第五十三態樣，根據該第十三態樣之自行車後輪轂總成經構形以使得：該第一外部周節角為該第二外部周節角之一半。 在根據第五十三態樣之自行車後輪轂總成之情況下，有可能易於在正確圓周位置中將自行車後鏈輪總成附接至自行車後輪轂總成。 根據本發明之一第五十四態樣，根據該第十四態樣之自行車後輪轂總成經構形以使得：該第一外部周節角範圍介於13度至17度。 在根據第五十四態樣之自行車後輪轂總成之情況下，第一外部周節角提高鏈輪支撐主體之耐久性，同時提高自行車後輪轂總成之生產率。 根據本發明之一第五十五態樣，根據該第四十五態樣之自行車後輪轂總成經構形以使得：該至少十個外部花鍵齒之一總數目範圍介於22至24。 在根據第五十五態樣之自行車後輪轂總成之情況下，至少十個外部花鍵齒之總數目提高鏈輪支撐主體之耐久性，同時提高自行車後輪轂總成之生產率。 根據本發明之一第五十六態樣，根據該第二十三態樣之自行車後輪轂總成經構形以使得：該複數個外部花鍵傳動表面之該等徑向長度的該總和範圍介於11 mm至14 mm。 在根據第五十六態樣之自行車後輪轂總成之情況下，徑向長度之總和在自行車後輪轂總成之生產率提高之範圍內提高鏈輪支撐主體之強度。According to a first aspect of the present invention, a bicycle rear hub assembly includes a hub shaft, a hub body, and a sprocket support body. The hub shaft includes a shaft through hole having a minimum inner diameter equal to or greater than 13 mm. The hub body is rotatably mounted on the hub shaft around a rotation center axis of the bicycle rear hub assembly. The sprocket support body is rotatably mounted on the hub shaft about the rotation center axis. In the case of the bicycle rear hub assembly according to the first aspect, it is possible to increase the strength of the bicycle transmission system around the rear wheel, because a wheel fastening shaft having a larger outer diameter can be installed on the bicycle rear hub assembly Inside the through hole of the hub shaft. According to a second aspect of the present invention, the bicycle rear hub assembly according to the first aspect is configured so that the minimum inner diameter of the shaft through hole is equal to or greater than 14 mm. In the case of the bicycle rear hub assembly according to the second aspect, it is possible to further increase the strength of the bicycle transmission system around the rear wheel, because the wheel fastening shaft with a larger outer diameter can be installed on the bicycle rear hub In the through hole of the hub shaft of the assembly. According to a third aspect of the present invention, the bicycle rear hub assembly according to the first aspect or the second aspect is configured so that the minimum inner diameter of the shaft through hole is equal to or less than 21 mm. In the case of the bicycle rear hub assembly according to the third aspect, it is possible to obtain the necessary internal space between the sprocket support body and the hub shaft and between the hub body and the hub shaft, and thereby improve the design of the bicycle rear hub Into a degree of freedom. According to a fourth aspect of the present invention, the bicycle rear hub assembly according to any one of the first aspect to the third aspect is configured so that the hub shaft has a maximum of one or more than 17 mm. Outer diameter. In the case of the bicycle rear hub assembly according to the fourth aspect, it is possible to increase the minimum inner diameter of the through hole of the hub shaft so as to increase the strength of the bicycle transmission system around the rear wheel. According to a fifth aspect of the present invention, the bicycle rear hub assembly according to the fourth aspect is configured so that the maximum outer diameter of the hub shaft is equal to or greater than 20 mm. In the case of the bicycle rear hub assembly according to the fifth aspect, it is possible to increase the minimum inner diameter of the shaft through hole of the hub shaft so as to increase the strength of the bicycle transmission system around the rear wheel. According to a sixth aspect of the present invention, the bicycle rear hub assembly according to the fifth aspect or the fifth aspect is configured such that the maximum outer diameter of the hub shaft is equal to or less than 23 mm. In the case of the bicycle rear hub assembly according to the sixth aspect, it is possible to obtain the necessary internal space between the sprocket support body and the hub shaft and between the hub body and the hub shaft, and thereby improve the design of the bicycle rear hub assembly Into a degree of freedom. According to a seventh aspect of the present invention, the bicycle rear hub assembly according to any one of the first aspect to the sixth aspect is configured such that the sprocket support body includes a configuration configured to communicate with a The bicycle rear sprocket assembly engages at least ten external spline teeth, each of the at least ten external spline teeth having an external spline drive surface and an external spline non-drive surface. In the case of the bicycle rear wheel hub assembly according to the seventh aspect, at least ten external spline teeth are reduced to at least ten external flowers compared to a sprocket support body including nine or fewer external spline teeth. Rotating force of each of the teeth. This improves the durability of the sprocket support body and / or increases the freedom of selecting the material of the sprocket support body without reducing the durability of the sprocket support body. According to an eighth aspect of the present invention, the bicycle rear hub assembly according to the seventh aspect is configured such that the total number of one of the at least ten external spline teeth is equal to or greater than 20. In the case of the bicycle rear hub assembly according to the eighth aspect, it is possible to further improve the durability of the sprocket support body and / or further increase the freedom of selecting the material of the sprocket support body without reducing the sprocket support body. Durability. According to a ninth aspect of the present invention, the bicycle rear hub assembly according to the seventh aspect is configured such that a total number of one of the at least ten external spline teeth is equal to or greater than 25. In the case of the bicycle rear hub assembly according to the ninth aspect, it is possible to further improve the durability of the sprocket support body and / or further increase the freedom of selecting the material of the sprocket support body without reducing the sprocket support body. Durability. According to a tenth aspect of the present invention, the bicycle rear hub assembly according to the seventh aspect is configured so that the total number of one of the at least ten external spline teeth is equal to or greater than 28. In the case of the bicycle rear hub assembly according to the tenth aspect, it is possible to further improve the durability of the sprocket support body and / or further increase the freedom of selecting the material of the sprocket support body without reducing the sprocket support body. Durability. According to an eleventh aspect of the present invention, the bicycle rear hub assembly according to any one of the seventh aspect to the tenth aspect is configured so that: at least one of the at least ten external spline teeth One has an axial spline tooth length equal to or less than 27 mm. In the case of the bicycle rear hub assembly according to the eleventh aspect, it is possible to reduce the weight of the bicycle rear hub assembly. According to a twelfth aspect of the present invention, the bicycle rear hub assembly according to the eleventh aspect is configured so that the axial spline tooth length is equal to or greater than 22 mm. In the case of the bicycle rear hub assembly according to the twelfth aspect, it is possible to increase the speed level of the bicycle rear sprocket assembly. According to a thirteenth aspect of the present invention, the bicycle rear hub assembly according to any one of the seventh aspect to the twelfth aspect is configured such that the at least ten external spline teeth have a The first external perimeter angle and a second external perimeter angle different from one of the first external perimeter angle. In the case of the bicycle rear hub assembly according to the thirteenth aspect, it is possible to easily attach the bicycle rear sprocket assembly to the bicycle rear hub assembly in the correct circumferential position. According to a fourteenth aspect of the present invention, the bicycle rear hub assembly according to any one of the seventh aspect to the thirteenth aspect is configured such that one of the at least ten outer spline teeth At least two outer spline teeth are arranged circumferentially at a first outer pitch angle with respect to the rotation center axis. The first outer perimeter angle ranges from 5 degrees to 36 degrees. In the case of the bicycle rear hub assembly according to the fourteenth aspect, it is possible to further improve the durability of the sprocket support body and / or further increase the freedom of selecting the material of the sprocket support body without reducing the sprocket support body Of durability. According to a fifteenth aspect of the present invention, the bicycle rear hub assembly according to the fourteenth aspect is configured so that the first outer peripheral angle ranges from 10 degrees to 20 degrees. In the case of the bicycle rear hub assembly according to the fifteenth aspect, it is possible to further improve the durability of the sprocket support body and / or further increase the freedom of selecting the material of the sprocket support body without reducing the sprocket support body Of durability. According to a sixteenth aspect of the present invention, the bicycle rear wheel hub assembly according to the fifteenth aspect is configured so that the first outer peripheral angle is equal to or less than 15 degrees. In the case of the bicycle rear hub assembly according to the sixteenth aspect, it is possible to further improve the durability of the sprocket support body and / or further increase the freedom of selecting the material of the sprocket support body without reducing the sprocket support body Of durability. According to a seventeenth aspect of the present invention, the bicycle rear hub assembly according to any one of the first aspect to the sixteenth aspect is configured such that the sprocket support body includes a configuration to At least one external spline tooth meshing with a bicycle rear sprocket assembly. The at least one external spline tooth has an external spline tip diameter equal to or less than 34 mm. In the case of the bicycle rear hub assembly according to the seventeenth aspect, it is possible to reduce the weight of the bicycle rear hub assembly. According to an eighteenth aspect of the present invention, the bicycle rear hub assembly according to the seventeenth aspect is configured so that the outer spline top diameter is equal to or less than 33 mm. In the case of the bicycle rear hub assembly according to the eighteenth aspect, it is possible to further reduce the weight of the bicycle rear hub assembly. According to a nineteenth aspect of the present invention, the bicycle rear hub assembly according to the seventeenth aspect is configured so that the outer spline top diameter is equal to or greater than 29 mm. In the case of the bicycle rear hub assembly according to the nineteenth aspect, it is possible to ensure the strength of the sprocket supporting body. According to a twentieth aspect of the present invention, the bicycle rear hub assembly according to any one of the first aspect to the nineteenth aspect is warped so that the sprocket support body includes a warp configuration to At least one external spline tooth meshing with a bicycle rear sprocket assembly. The at least one external spline tooth has an external spline base diameter equal to or less than 32 mm. In the case of the bicycle rear hub assembly according to the twentieth aspect, the outer diameter of the outer spline can increase the radial length of the transmission surface of the at least one outer spline tooth. This increases the strength of the sprocket support body. According to a twenty-first aspect of the present invention, the bicycle rear hub assembly according to the twentieth aspect is configured so that the bottom diameter of the external spline is equal to or less than 31 mm. In the case of the bicycle rear hub assembly according to the twenty-first aspect, the outer diameter of the outer spline can increase the radial length of the transmission surface of at least one outer spline tooth. This increases the strength of the sprocket support body. According to a twenty-second aspect of the present invention, the bicycle rear hub assembly according to the twentieth aspect or the twenty-first aspect is configured so that the bottom diameter of the external spline is equal to or greater than 28 mm . In the case of the bicycle rear hub assembly according to the twenty-second aspect, it is possible to ensure the strength of the sprocket support body. According to a twenty-third aspect of the present invention, the rear wheel hub assembly of the bicycle according to any one of the first aspect to the twenty-second aspect is configured such that the sprocket support body includes a warp structure. At least one outer spline tooth shaped to mesh with a bicycle rear sprocket assembly. The at least one external spline tooth includes a plurality of external spline teeth, the plurality of external spline teeth includes a plurality of external spline drive surfaces to receive a driving rotational force from one of the bicycle rear sprocket assemblies during pedaling. Each of the plurality of external spline transmission surfaces includes a radially outermost edge, a radially innermost edge, and a radial length defined from the radially outermost edge to the radially innermost edge. A sum of the radial lengths of the plurality of external spline drive surfaces is equal to or greater than 7 mm. In the case of the bicycle rear hub assembly according to the twenty-third aspect, it is possible to increase the radial length of the plurality of external spline drive surfaces. This increases the strength of the sprocket support body. According to a twenty-fourth aspect of the present invention, the bicycle rear hub assembly according to the twenty-third aspect is configured such that the sum of the radial lengths is equal to or greater than 10 mm. In the case of the bicycle rear hub assembly according to the twenty-fourth aspect, it is possible to further increase the radial length of the plurality of external spline drive surfaces. This increases the strength of the sprocket support body. According to a twenty-fifth aspect of the present invention, the bicycle rear hub assembly according to the twenty-third aspect is configured such that the sum of the radial lengths is equal to or greater than 15 mm. In the case of the bicycle rear hub assembly according to the twenty-fifth aspect, it is possible to further increase the radial length of the plurality of external spline drive surfaces. This increases the strength of the sprocket support body. According to a twenty-sixth aspect of the present invention, the bicycle rear hub assembly according to any one of the twenty-third aspect to the twenty-fifth aspect is configured such that: This sum is equal to or less than 36 mm. In the case of the bicycle rear hub assembly according to the twenty-sixth aspect, it is possible to improve the productivity of the sprocket support body. According to a twenty-seventh aspect of the present invention, the bicycle rear hub assembly according to any one of the first aspect to the twenty-sixth aspect is configured such that the hub body includes: a first A spoke mounting portion having a first axially outermost portion; a second spoke mounting portion having a second axially outermost portion; and a first axial length relative to the bicycle rear sprocket The rotation center axis of the assembly is defined in an axial direction between the first axially outermost portion of the first spoke mounting portion and the second axially outermost portion of the second spoke mounting portion. The first axial length is equal to or greater than 55 mm. In the case of the bicycle rear hub assembly according to the twenty-seventh aspect, the first axial length increases the strength of the wheel including the bicycle rear hub assembly. According to a twenty-eighth aspect of the present invention, the bicycle rear hub assembly according to the twenty-seventh aspect is configured so that the first axial length is equal to or greater than 60 mm. In the case of the bicycle rear hub assembly according to the twenty-eighth aspect, the first axial length further increases the strength of the wheel including the bicycle rear hub assembly. According to a twenty-ninth aspect of the present invention, the bicycle rear hub assembly according to the twenty-seventh aspect is configured so that the first axial length is equal to or greater than 65 mm. In the case of the bicycle rear hub assembly according to the twenty-ninth aspect, the first axial length further increases the strength of the wheel including the bicycle rear hub assembly. According to a thirtieth aspect of the present invention, the bicycle rear hub assembly according to any one of the first aspect to the twenty-ninth aspect is configured such that the hub shaft includes a first axial direction The frame abutting surface, a second axial frame abutting surface, and a second axial length. The first axial frame abutting surface is configured to abut an axial direction relative to the rotation center axis of the bicycle rear sprocket assembly in an axial direction when the bicycle rear hub assembly is mounted to a bicycle frame Bicycle frame one part one. The second axial frame abutting surface is configured to abut a second portion of the bicycle frame in the axial direction in the state in which the bicycle rear hub assembly is mounted to the bicycle frame. The second axial length is defined in the axial direction between the first axial frame abutting surface and the second axial frame abutting surface. This second axial length is equal to or greater than 140 mm. In the case of the bicycle rear hub assembly according to the thirtieth aspect, the second axial length allows the bicycle rear hub assembly to be attached to a plurality of types of bicycle frames while obtaining the effects of the first aspect. According to a thirty-first aspect of the present invention, the bicycle rear hub assembly according to the thirtieth aspect is configured so that the second axial length is equal to or greater than 145 mm. In the case of the bicycle rear hub assembly according to the thirty-first aspect, the second axial length is increased to select the freedom of the first axial length and / or to achieve a wider gear range of the bicycle rear sprocket assembly. According to a thirty-second aspect of the present invention, the bicycle rear hub assembly according to the thirtieth aspect is configured so that the second axial length is equal to or greater than 147 mm. In the case of the bicycle rear hub assembly according to the thirty-second aspect, the second axial length is increased to select the freedom of the first axial length and / or to achieve a wider gear range of the bicycle rear sprocket assembly. According to a thirty-third aspect of the present invention, the bicycle rear hub assembly according to any one of the first aspect to the thirty-second aspect further includes a free wheel structure. The free wheel structure includes: a first ratchet member including at least one first ratchet tooth; and a second ratchet member including at least one configured to mesh with the at least one first ratchet tooth in a torque transmitting manner. One second ratchet tooth. The first ratchet member is configured to mesh with one of the hub body and the sprocket support body in a torque transmitting manner. The second ratchet member is configured to mesh with the other of the hub body and the sprocket support body in a torque transmitting manner. At least one of the first ratchet member and the second ratchet member is movable relative to the hub shaft in an axial direction relative to the rotation center axis. In the case of the bicycle rear hub assembly according to the thirty-third aspect, it is possible to further improve the transmission efficiency of the bicycle rear hub assembly and reduce the weight of the free wheel structure. According to a thirty-fourth aspect of the present invention, the bicycle rear hub assembly according to the thirty-third aspect is configured so that the at least one first ratchet tooth is disposed in an axial direction of the first ratchet member. On the surface. The at least one second ratchet tooth is disposed on an axial surface of the second ratchet member. The axial surface of the second ratchet member faces the axial surface of the first ratchet member. In the case of the bicycle rear hub assembly according to the thirty-fourth aspect, it is possible to further improve the transmission efficiency of the bicycle rear hub assembly and reduce the weight of the free wheel structure. According to a thirty-fifth aspect of the present invention, according to the thirty-third aspect or the thirty-fourth aspect, the bicycle rear hub assembly is configured so that the sprocket support body has a first The outer peripheral surface of one of the spiral splines. The first ratchet member is configured to mesh with the sprocket support body in a torque transmitting manner, and includes a second spiral spline that cooperates with the first spiral spline. In the case of the bicycle rear hub assembly according to the thirty-fifth aspect, it is possible to smooth the engagement and / or disengagement between the first ratchet member and the second ratchet member. According to a thirty-sixth aspect of the present invention, the bicycle rear hub assembly according to the thirty-fifth aspect is configured such that the outer peripheral surface of the sprocket support body is configured to idle in rotation A guide portion of the first ratchet member is guided toward the hub body in the meantime. In the case of the bicycle rear hub assembly according to the thirty-sixth aspect, it is possible to reduce the noise generated in the free wheel structure during idle rotation. According to a thirty-seventh aspect of the present invention, the bicycle rear hub assembly according to the thirty-sixth aspect is configured so that the guide portion guides the first ratchet toward the hub body during idle rotation. The component is configured to release an engagement between the at least one first ratchet tooth and the at least one second ratchet tooth. In the case of the bicycle rear hub assembly according to the thirty-seventh aspect, it is possible to further reduce the noise generated in the free wheel structure during idle rotation. According to a thirty-eighth aspect of the present invention, the bicycle rear hub assembly according to the thirty-sixth aspect or the thirty-seventh aspect is configured so that the guide portion is opposite to the sprocket. The support body extends in at least one circumferential direction. In the case of the bicycle rear hub assembly according to the thirty-eighth aspect, it is possible to further reduce the noise generated in the free wheel structure during idle rotation. According to a thirty-ninth aspect of the present invention, the bicycle rear hub assembly according to any one of the thirty-sixth aspect to the thirty-eighth aspect is configured such that the guide portion is configured An obtuse angle is defined with the first spiral spline. In the case of the bicycle rear hub assembly according to the thirty-ninth aspect, it is possible to further reduce noise generated in the free wheel structure during idle rotation. According to a fortieth aspect of the present invention, the bicycle rear hub assembly according to any one of the thirty-third aspect to the thirty-ninth aspect is configured such that: the first ratchet member and the Each of the second ratchet members has an annular shape. In the case of the bicycle rear hub assembly according to the fortieth aspect, it is possible to further improve the transmission efficiency of the bicycle rear hub assembly and reduce the weight of the free wheel structure. According to a forty-first aspect of the present invention, the bicycle rear hub assembly according to any one of the first aspect to the fortieth aspect further includes: a brake rotor supporting body including a warped structure to At least one additional external spline tooth meshing with a bicycle brake rotor. The at least one additional external spline tooth has an additional external spline tip diameter that is larger than one of the external spline tip diameters. In the case of the bicycle rear hub assembly according to the forty-first aspect, the brake rotor supporting body improves the braking efficiency, while widening the gear range of the bicycle rear sprocket assembly mounted to the bicycle rear hub assembly, and simultaneously obtaining A look of effect. The brake rotor support body also improves the attachment and detachment properties of the bicycle brake rotor. According to a forty-second aspect of the present invention, the bicycle rear hub assembly according to any one of the seventh aspect to the sixteenth aspect is configured so that: the at least ten external spline teeth At least one of them is circumferentially symmetrical with respect to a reference line extending from the rotation center axis to the at least one of the at least ten external spline teeth in a radial direction with respect to the rotation center axis. A radially outermost center point of a circle. In the case of the bicycle rear hub assembly according to the forty-second aspect, it is possible to improve the productivity of the sprocket support body. According to a forty-third aspect of the present invention, the bicycle rear hub assembly according to the forty-second aspect is configured so that at least one of the plurality of external spline drive surfaces has a surface defined on the exterior A first external spline surface angle between the spline drive surface and a first radial line, the first radial line extending from a rotation center axis of the bicycle rear hub assembly to the outer spline drive surface A radially outermost edge. The first external spline surface angle is equal to or less than 6 degrees. In the case of the bicycle rear hub assembly according to the forty-third aspect, it is possible to increase the strength of the external spline drive surface. According to a forty-fourth aspect of the present invention, the bicycle rear hub assembly according to the forty-second aspect or the forty-third aspect is configured so that: the external splines are not in the transmission surface. At least one has a second outer spline surface angle defined between the outer spline non-drive surface and a second radial line, the second radial line from the center axis of rotation of the bicycle rear hub assembly Extending to one of the radially outermost edges of the non-drive surface of the external spline. The second external spline surface angle is equal to or less than 6 degrees. In the case of the bicycle rear hub assembly according to the forty-fourth aspect, it is possible to improve the productivity of the bicycle rear sprocket assembly due to the symmetrical configuration between the external spline drive surface and the external spline non-drive surface. According to a forty-fifth aspect of the present invention, a bicycle rear hub assembly includes a hub shaft, a hub body, and a sprocket support body. The hub body is rotatably mounted on the hub shaft around a rotation center axis of the bicycle rear hub assembly. The sprocket support body is rotatably mounted on the hub shaft about the rotation center axis. The sprocket support body includes at least ten external spline teeth configured to engage a bicycle rear sprocket assembly. Each of the at least ten external spline teeth has an external spline drive surface and an external spline non-drive surface. At least one of the at least ten external spline teeth is circumferentially symmetrical with respect to a reference line that extends from the rotation center axis to the at least ten external flowers in a radial direction with respect to the rotation center axis. One of the at least one of the at least one of the teeth is a center point of a circle at a radially outermost end. In the case of the bicycle rear hub assembly according to the forty-fifth aspect, at least ten external spline teeth are reduced to at least ten compared to a sprocket support body including nine or fewer external spline teeth. Rotating force of each of the external spline teeth. This improves the durability of the sprocket support body and / or increases the freedom of selecting the material of the sprocket support body without reducing the durability of the sprocket support body. In addition, the symmetrical shape improves the productivity of the sprocket support body. The forty-fifth aspect of the present invention may be combined with any one of the first aspect to the forty-fourth aspect. According to a forty-sixth aspect of the present invention, the bicycle rear hub assembly according to the forty-fifth aspect is configured so that the total number of one of the at least ten external spline teeth is equal to or greater than 28. In the case of the bicycle rear hub assembly according to the forty-sixth aspect, it is possible to improve the durability of the sprocket support body and / or increase the freedom of selecting the material of the sprocket support body without reducing the sprocket support body. Durability. According to a forty-seventh aspect of the present invention, the bicycle rear hub assembly according to the forty-fifth aspect or the forty-sixth aspect is configured such that: at least one of the external spline drive surfaces One surface has a first external spline surface angle defined between the external spline transmission surface and a first radial line, the first radial line extending from a rotation center axis of the bicycle rear hub assembly to One of the outer spline drive surfaces is the radially outermost edge. The first external spline surface angle is equal to or less than 6 degrees. In the case of the bicycle rear hub assembly according to the forty-seventh aspect, it is possible to increase the strength of the external spline drive surface. According to a forty-eighth aspect of the present invention, the bicycle rear hub assembly according to the forty-seventh aspect is configured so that at least one of the external spline non-drive surfaces has a boundary defined on the exterior A second external spline surface angle between the spline non-driving surface and a second radial line extending from the rotation center axis of the bicycle rear hub assembly to the external spline non-driving One of the radially outermost edges. The second external spline surface angle is equal to or less than 6 degrees. In the case of the bicycle rear hub assembly according to the forty-eighth aspect, it is possible to improve the productivity of the bicycle rear sprocket assembly due to the symmetrical configuration between the external spline drive surface and the external spline non-drive surface. According to a forty-ninth aspect of the present invention, the bicycle rear hub assembly according to any one of the forty-fifth aspect to the forty-eighth aspect is configured so that: the at least ten external splines At least one of the teeth has an axial spline tooth length equal to or less than 27 mm. In the case of the bicycle rear hub assembly according to the forty-ninth aspect, it is possible to reduce the weight of the sprocket support body. According to a fiftieth aspect of the present invention, the bicycle rear hub assembly according to any one of the seventh aspect to the tenth aspect is configured such that: at least one of the at least ten outer spline teeth One has an axial spline tooth length equal to or less than 27 mm. In the case of the bicycle rear hub assembly according to the fiftieth aspect, it is possible to reduce the weight of the sprocket support body. According to a fifty-first aspect of the present invention, the bicycle rear hub assembly according to the seventh aspect is configured such that a total number of one of the at least ten outer spline teeth ranges from 22 to 24. In the case of the bicycle rear hub assembly according to the fifty-first aspect, the total number of at least ten external spline teeth improves the durability of the sprocket support body, and at the same time improves the productivity of the bicycle rear hub assembly. According to a fifty-second aspect of the present invention, the bicycle rear hub assembly according to the thirteenth aspect is configured so that the first outer peripheral angle ranges from 13 degrees to 17 degrees. The second outer perimeter angle ranges from 28 degrees to 32 degrees. In the case of the bicycle rear hub assembly according to the fifty-second aspect, it is possible to easily attach the bicycle rear sprocket assembly to the bicycle rear hub assembly in the correct circumferential position while improving the durability of the sprocket support body Performance and productivity of bicycle rear hub assembly. According to a fifty-third aspect of the present invention, the bicycle rear wheel hub assembly according to the thirteenth aspect is configured so that the first outer peripheral angle is one and a half of the second outer peripheral angle. In the case of the bicycle rear hub assembly according to the fifty-third aspect, it is possible to easily attach the bicycle rear sprocket assembly to the bicycle rear hub assembly in the correct circumferential position. According to a fifty-fourth aspect of the present invention, the bicycle rear wheel hub assembly according to the fourteenth aspect is configured so that the first outer peripheral angle ranges from 13 degrees to 17 degrees. In the case of the bicycle rear hub assembly according to the fifty-fourth aspect, the first outer perimeter angle improves the durability of the sprocket support body, and at the same time improves the productivity of the bicycle rear hub assembly. According to a fifty-fifth aspect of the present invention, the bicycle rear hub assembly according to the forty-fifth aspect is configured so that the total number of one of the at least ten external spline teeth ranges from 22 to 24 . In the case of the bicycle rear hub assembly according to the fifty-fifth aspect, the total number of at least ten external spline teeth improves the durability of the sprocket support body, and at the same time improves the productivity of the bicycle rear hub assembly. According to a fifty-sixth aspect of the present invention, the bicycle rear hub assembly according to the twenty-third aspect is configured so that: the total range of the radial lengths of the plurality of external spline drive surfaces Between 11 mm and 14 mm. In the case of the bicycle rear hub assembly according to the fifty-sixth aspect, the sum of the radial lengths increases the strength of the sprocket support body within the range of the productivity improvement of the bicycle rear hub assembly.

相關申請案之交叉參考 本申請案為2017年9月22日申請之美國專利申請案第15/712,407之部分接續申請案。此申請案之內容以全文引用之方式併入本文中。現將參考附圖描述實施例，其中相似參考數字指定在各種圖式中的對應或相同元件。 首先參考圖1，根據一實施例之自行車傳動系統10包含自行車後輪轂總成12及自行車後鏈輪總成14。自行車後輪轂總成12緊固至自行車框架BF。自行車後鏈輪總成14安裝於自行車後輪轂總成12上。自行車制動轉子16安裝於自行車後輪轂總成12上。 自行車傳動系統10進一步包含曲柄總成18及自行車鏈條20。曲柄總成18包括曲柄軸22、右曲柄臂24、左曲柄臂26及前鏈輪27。右曲柄臂24及左曲柄臂26緊固至曲柄軸22。前鏈輪27緊固至曲柄軸22及右曲柄臂24中之至少一者。自行車鏈條20與前鏈輪27及自行車後鏈輪總成14嚙合以將踩踏力自前鏈輪27傳遞至自行車後鏈輪總成14。曲柄總成18包括前鏈輪27作為所說明實施例中之單一鏈輪。然而，曲柄總成18可包括複數個前鏈輪。自行車後鏈輪總成14為後鏈輪總成。然而，自行車後鏈輪總成14之結構可應用於前鏈輪。 在本申請案中，以下方向性術語「前」、「後」、「向前」、「向後」、「左」、「右」、「橫向」、「向上」及「向下」以及任何其他類似方向性術語係指基於坐在自行車之車座(未展示)上且面向把手(未展示)的使用者(例如，騎乘者)而判定之彼等方向。因此，此等術語在用以描述自行車傳動系統10、自行車後輪轂總成12或自行車後鏈輪總成14時，應關於配備有如在水平表面上在直立騎乘位置中所使用之自行車傳動系統10、自行車後輪轂總成12或自行車後鏈輪總成14的自行車而加以解譯。 如圖2中所見，自行車後輪轂總成12及自行車後鏈輪總成14具有旋轉中心軸線A1。自行車後鏈輪總成14相對於自行車框架BF (圖1)圍繞旋轉中心軸線A1由自行車後輪轂總成12可旋轉地支撐。自行車後鏈輪總成14經構形以與自行車鏈條20嚙合，從而在踩踏期間在自行車鏈條20與自行車後鏈輪總成14之間傳遞傳動旋轉力F1。在踩踏期間，自行車後鏈輪總成14在傳動旋轉方向D11上圍繞旋轉中心軸線A1旋轉。傳動旋轉方向D11係沿自行車後輪轂總成12或自行車後鏈輪總成14之圓周方向D1界定。反向旋轉方向D12為傳動旋轉方向D11之相反方向，且係沿圓周方向D1界定。 如圖2中所見，自行車後輪轂總成12包含鏈輪支撐主體28。自行車後鏈輪總成14經構形以安裝至自行車後輪轂總成12之鏈輪支撐主體28。自行車後鏈輪總成14安裝於鏈輪支撐主體28上以在鏈輪支撐主體28與自行車後鏈輪總成14之間傳遞傳動旋轉力F1。自行車後輪轂總成12包含輪轂軸30。鏈輪支撐主體28圍繞旋轉中心軸線A1可旋轉地安裝於上輪轂軸30。自行車後鏈輪總成14進一步包含鎖定構件32。鎖定構件32緊固至鏈輪支撐主體28以相對於旋轉中心軸線A1在軸向方向D2上相對於鏈輪支撐主體28固持自行車後鏈輪總成14。 如圖3中所見，自行車後輪轂總成12藉由車輪緊固結構WS緊固至自行車框架BF。輪轂軸30包括軸通孔30A。車輪緊固結構WS之緊固桿WS1延伸穿過輪轂軸30之軸通孔30A。輪轂軸30包括第一軸端30B及第二軸端30C。輪轂軸30沿旋轉中心軸線A1在第一軸端30B與第二軸端30C之間延伸。第一軸端30B設置於自行車框架BF之第一框架BF1之第一凹槽BF11中。第二軸端30C設置於自行車框架BF之第二框架BF2之第二凹槽BF21中。輪轂軸30藉由車輪緊固結構WS固持於第一框架BF1與第二框架BF2之間。車輪緊固結構WS包括在所申請自行車中已知的結構。因此，出於簡潔起見，此處將不作詳細描述。 在此實施例中，軸通孔30A具有等於或大於13 mm之最小內徑BD1。軸通孔30A之最小內徑BD1較佳地等於或大於14 mm。軸通孔30A之最小內徑BD1較佳地等於或小於21 mm。在此實施例中，軸通孔30A之最小內徑BD1為15 mm。然而，最小內徑BD1不限於此實施例及以上範圍。 輪轂軸30具有等於或大於17 mm之最大外徑BD2。輪轂軸30之最大外徑BD2較佳地等於或大於20 mm。輪轂軸30之最大外徑BD2較佳地等於或小於23 mm。在此實施例中，輪轂軸30之最大外徑BD2為21 mm。然而，輪轂軸30之最大外徑BD2不限於此實施例及以上範圍。輪轂軸30具有等於或大於15 mm之最小外徑BD3。最小外徑BD3較佳地等於或大於17 mm。最小外徑BD3較佳地等於或小於19 mm。在此實施例中，輪轂軸30之最小外徑BD3為17.6 mm。然而，最小外徑BD3不限於此實施例及以上範圍。 輪轂軸30包括軸管30X、第一軸部分30Y及第二軸部分30Z。軸管30X具有管狀形狀，且沿著旋轉中心軸線A1延伸。第一軸部分30Y緊固至軸管30X之第一端。第二軸部分30Z緊固至軸管30X之第二端。第一軸部分30Y及第二軸部分30Z中之至少一者可與軸管30X一體地設置。 如圖3及圖4中所見，自行車後輪轂總成12進一步包含制動轉子支撐主體34。制動轉子支撐主體34圍繞旋轉中心軸線A1可旋轉地安裝於輪轂軸30上。制動轉子支撐主體34耦接至自行車制動轉子16 (圖1)以將制動旋轉力自自行車制動轉子16傳遞至制動轉子支撐主體34。 如圖4中所見，自行車後輪轂總成12包含輪轂主體36。輪轂主體36圍繞自行車後輪轂總成12之旋轉中心軸線A1可旋轉地安裝於輪轂軸30上。在此實施例中，鏈輪支撐主體28為與輪轂主體36分離之構件。制動轉子支撐主體34與輪轂主體36一體地設置為單件式整體構件。然而，鏈輪支撐主體28可與輪轂主體36一體地設置。制動轉子支撐主體34可為與輪轂主體36分離之構件。舉例而言，輪轂主體36由包括鋁之金屬材料製成。 如圖5中所見，自行車後鏈輪總成14包含複數個自行車鏈輪。複數個自行車鏈輪包含第一鏈輪及第二鏈輪。在此實施例中，複數個自行車鏈輪包含作為第一鏈輪提供之複數個第一鏈輪SP1及SP2。該複數個自行車鏈輪亦包含作為第二鏈輪提供之複數個第二鏈輪SP3及SP4。該複數個自行車鏈輪包含額外鏈輪。在此實施例中，該複數個自行車鏈輪包含複數個額外鏈輪SP5至SP12。然而，第一鏈輪之總數目不限於此實施例。第二鏈輪之總數目不限於此實施例。額外鏈輪之總數目不限於此實施例。另外，第一鏈輪SP1與SP2可整體形成為單件式整體構件，而第一鏈輪SP1在此實施例中為與第一鏈輪SP2分離之鏈輪。同理，第二鏈輪SP3與SP4可整體形成為單件式整體構件，而第二鏈輪SP3在此實施例中為與第二鏈輪SP4分離之鏈輪。 舉例而言，該複數個自行車鏈輪之總數目等於或大於10。該複數個自行車鏈輪之總數目可等於或大於11。該複數個自行車鏈輪之總數目可等於或大於12。在此實施例中，該複數個自行車鏈輪之總數目為12。然而，該複數個自行車鏈輪總數目不限於此實施例。舉例而言，該複數個自行車鏈輪之總數可為13、14、或等於或大於15。 在此實施例中，第一鏈輪SP1為自行車後鏈輪總成14中之最小鏈輪。額外鏈輪SP12為自行車後鏈輪總成14中之最大鏈輪。第一鏈輪SP2對應於自行車後鏈輪總成14中之高速齒輪。額外鏈輪SP12對應於自行車後鏈輪總成14中之低速齒輪。 如圖5中所見，第一鏈輪SP1具有節圓直徑PCD1。第一鏈輪SP2具有節圓直徑PCD2。第二鏈輪SP3具有節圓直徑PCD3。第二鏈輪SP4具有節圓直徑PCD4。額外鏈輪SP5具有節圓直徑PCD5。額外鏈輪SP6具有節圓直徑PCD6。額外鏈輪SP7具有節圓直徑PCD7。額外鏈輪SP8具有節圓直徑PCD8。額外鏈輪SP9具有節圓直徑PCD9。額外鏈輪SP10具有節圓直徑PCD10。額外鏈輪SP11具有節圓直徑PCD11。額外鏈輪SP12具有節圓直徑PCD12。 第一鏈輪SP1具有具有節圓直徑PCD1之節圓PC1。第一鏈輪SP2具有具有節圓直徑PCD2之節圓PC2。第二鏈輪SP3具有具有節圓直徑PCD3之節圓PC3。第二鏈輪SP4具有具有節圓直徑PCD4之節圓PC4。額外鏈輪SP5具有具有節圓直徑PCD5之節圓PC5。額外鏈輪SP6具有具有節圓直徑PCD6之節圓PC6。額外鏈輪SP7具有具有節圓直徑PCD7之節圓PC7。額外鏈輪SP8具有具有節圓直徑PCD8之節圓PC8。額外鏈輪SP9具有具有節圓直徑PCD9之節圓PC9。額外鏈輪SP10具有具有節圓直徑PCD10之節圓PC10。額外鏈輪SP11具有具有節圓直徑PCD11之節圓PC11。額外鏈輪SP12具有具有節圓直徑PCD12之節圓PC12。 第一鏈輪SP1之節圓PC1由與第一鏈輪SP1嚙合之自行車鏈20 (圖2)之銷的中心軸線界定。定義節圓PC2至PC12以及節圓PC1。因此，出於簡潔起見，此處將不作詳細描述。 在此實施例中，節圓直徑PCD1小於節圓直徑PCD2。節圓直徑PCD2小於節圓直徑PCD3。節圓直徑PCD3小於節圓直徑PCD4。節圓直徑PCD4小於節圓直徑PCD5。節圓直徑PCD5小於節圓直徑PCD6。節圓直徑PCD6小於節圓直徑PCD7。節圓直徑PCD7小於節圓直徑PCD8。節圓直徑PCD8小於節圓直徑PCD9。節圓直徑PCD9小於節圓直徑PCD10。節圓直徑PCD10小於節圓直徑PCD11。節圓直徑PCD11小於節圓直徑PCD12。 節圓直徑PCD1為自行車後鏈輪總成14中之最小節圓直徑。節圓直徑PCD12為自行車後鏈輪總成14中之最大節圓直徑。第一鏈輪SP1對應於自行車後鏈輪總成14中之高速齒輪。額外鏈輪SP12對應於自行車後鏈輪總成14中之低速齒輪。然而，第一鏈輪SP1可對應於自行車後鏈輪總成14中之另一齒輪。額外鏈輪SP12可對應於自行車後鏈輪總成14中之另一齒輪。 如圖6中所見，第一鏈輪SP2相對於自行車後鏈輪總成14之旋轉中心軸線A1在軸向方向D2上鄰近於第一鏈輪SP1，而在第一鏈輪SP1與SP2之間無另一鏈輪。第二鏈輪SP3相對於自行車後鏈輪總成14之旋轉中心軸線A1在軸向方向D2上鄰近於第一鏈輪SP2，而在第一鏈輪SP2與第二鏈輪SP3之間無另一鏈輪。第二鏈輪SP4相對於自行車後鏈輪總成14之旋轉中心軸線A1在軸向方向D2上鄰近於第二鏈輪SP3，而在第二鏈輪SP3與第二鏈輪SP4之間無另一鏈輪。第一鏈輪SP1及SP2、第二鏈輪SP3、第二鏈輪SP4及額外鏈輪SP5至SP12以此次序在軸向方向D2上配置。 如圖7中所見，第一鏈輪SP1包括鏈輪主體SP1A及複數個鏈輪齒SP1B。複數個鏈輪齒SP1B相對於自行車後鏈輪總成14之旋轉中心軸線A1自鏈輪主體SP1A徑向向外延伸。第一鏈輪SP1之總齒數(至少一個鏈輪齒SP1B之總數目)等於或小於10。在此實施例中，第一鏈輪SP1之至少一個鏈輪齒SP1B的總數目為10。然而，第一鏈輪SP1之複數個鏈輪齒SP1B的總數目不限於此實施例及以上範圍。 如圖8中所見，第一鏈輪SP2包括鏈輪主體SP2A及複數個鏈輪齒SP2B。複數個鏈輪齒SP2B相對於自行車後鏈輪總成14之旋轉中心軸線A1自鏈輪主體SP2A徑向向外延伸。在此實施例中，至少一個鏈輪齒SP2B之總數目為12。然而，第一鏈輪SP2之複數個鏈輪齒SP2B的總數目不限於此實施例。 第一鏈輪SP2包括至少一個第一移位促進區域SP2F1以促進自行車鏈20自第一鏈輪SP2移位至第一鏈輪SP1之第一移位操作。第一鏈輪SP2包括至少一個第二移位促進區域SP2F2以促進自行車鏈20自第一鏈輪SP1移位至第一鏈輪SP2之第二移位操作。在此實施例中，第一鏈輪SP2包括用以促進第一移位操作之複數個第一移位促進區域SP2F1。第一鏈輪SP2包括用以促進第二移位操作之複數個第二移位促進區域SP2F2。然而，第一移位促進區域SP2F1之總數目不限於此實施例。第二移位促進區域SP2F2之總數目不限於此實施例。如本文所使用之術語「移位促進區域」意欲為有意設計成便於自行車鏈自鏈輪至該區域中之另一軸向鄰近鏈輪之移位操作的區域。 在此實施例中，第一鏈輪SP2包括用以促進第一移位操作之複數個第一移位促進凹槽SP2R1。第一鏈輪SP2包括用以促進第二移位操作之複數個第二移位促進凹槽SP2R2。第一移位促進凹槽SP2R1設置於第一移位促進區域SP2F1中。然而，第一移位促進區域SP2F1可包括另一結構來替代或補充第一移位促進凹槽SP2R1。第二移位促進區域SP2F2可包括另一結構來替代或補充第二移位促進凹槽SP2R2。 如圖9中所見，第二鏈輪SP3包括鏈輪主體SP3A及複數個鏈輪齒SP3B。複數個鏈輪齒SP3B相對於自行車後鏈輪總成14之旋轉中心軸線A1自鏈輪主體SP3A徑向向外延伸。在此實施例中，至少一個鏈輪齒SP3B之總數目為14。然而，第二鏈輪SP3之複數個鏈輪齒SP3B的總數目不限於此實施例。 第二鏈輪SP3包括至少一個第一移位促進區域SP3F1以促進自行車鏈20自第二鏈輪SP3移位至第一鏈輪SP2 (圖6)之第一移位操作。第二鏈輪SP3包括至少一個第二移位促進區域SP3F2以促進自行車鏈20自第一鏈輪SP2 (圖6)移位至第二鏈輪SP3之第二移位操作。在此實施例中，第二鏈輪SP3包括用以促進第一移位操作之複數個第一移位促進區域SP3F1。第二鏈輪SP3包括用以促進第二移位操作之複數個第二移位促進區域SP3F2。然而，第一移位促進區域SP3F1之總數目不限於此實施例。第二移位促進區域SP3F2之總數目不限於此實施例。 在此實施例中，第二鏈輪SP3包括用以促進第一移位操作之複數個第一移位促進凹槽SP3R1。第二鏈輪SP3包括用以促進第二移位操作之複數個第二移位促進凹槽SP3R2。第一移位促進凹槽SP3R1設置於第一移位促進區域SP3F1中。然而，第一移位促進區域SP3F1可包括另一結構來替代或補充第一移位促進凹槽SP3R1。第二移位促進區域SP3F2可包括另一結構來替代或補充第二移位促進凹槽SP3R2。 如圖10中所見，第二鏈輪SP4包括鏈輪主體SP4A及複數個鏈輪齒SP4B。複數個鏈輪齒SP4B相對於自行車後鏈輪總成14之旋轉中心軸線A1自鏈輪主體SP4A徑向向外延伸。在此實施例中，至少一個鏈輪齒SP4B之總數目為16。然而，第二鏈輪SP4之複數個鏈輪齒SP4B的總數目不限於此實施例。 第二鏈輪SP4包括至少一個第一移位促進區域SP4F1以促進自行車鏈20自第二鏈輪SP4移位至第二鏈輪SP3之第一移位操作。第二鏈輪SP4包括至少一個第二移位促進區域SP4F2以促進自行車鏈20自第二鏈輪SP3移位至第二鏈輪SP4之第二移位操作。在此實施例中，第二鏈輪SP4包括用以促進第一移位操作之複數個第一移位促進區域SP4F1。第二鏈輪SP4包括用以促進第二移位操作之複數個第二移位促進區域SP4F2。然而，第一移位促進區域SP4F1之總數目不限於此實施例。第二移位促進區域SP4F2之總數目不限於此實施例。 在此實施例中，第二鏈輪SP4包括用以促進第一移位操作之複數個第一移位促進凹槽SP4R1。第二鏈輪SP4包括用以促進第二移位操作之複數個第二移位促進凹槽SP4R2。第一移位促進凹槽SP4R1設置於第一移位促進區域SP4F1中。然而，第一移位促進區域SP4F1可包括另一結構來替代或補充第一移位促進凹槽SP4R1。第二移位促進區域SP4F2可包括另一結構來替代或補充第二移位促進凹槽SP4R2。 如圖11中所見，額外鏈輪SP5包括鏈輪主體SP5A及複數個鏈輪齒SP5B。複數個鏈輪齒SP5B相對於自行車後鏈輪總成14之旋轉中心軸線A1自鏈輪主體SP5A徑向向外延伸。在此實施例中，至少一個鏈輪齒SP5B之總數目為18。然而，額外鏈輪SP5之複數個鏈輪齒SP5B的總數目不限於此實施例。 額外鏈輪SP5包括至少一個第一移位促進區域SP5F1以促進自行車鏈20自額外鏈輪SP5移位至相鄰更小鏈輪SP4之第一移位操作。額外鏈輪SP5包括至少一個第二移位促進區域SP5F2以促進自行車鏈20自相鄰更小鏈輪SP4移位至額外鏈輪SP5之第二移位操作。相鄰更小鏈輪SP4相對於自行車後鏈輪總成14之旋轉中心軸線A1在軸向方向D2上鄰近於額外鏈輪SP5，而在額外鏈輪SP5與相鄰更小鏈輪SP4之間無另一鏈輪。在此實施例中，額外鏈輪SP5包括用以促進第一移位操作之複數個第一移位促進區域SP5F1。額外鏈輪SP5包括用以促進第二移位操作之複數個第二移位促進區域SP5F2。然而，第一移位促進區域SP5F1之總數目不限於此實施例。第二移位促進區域SP5F2之總數目不限於此實施例。 在此實施例中，額外鏈輪SP5包括用以促進第一移位操作之複數個第一移位促進凹槽SP5R1。額外鏈輪SP5包括用以促進第二移位操作之複數個第二移位促進凹槽SP5R2。第一移位促進凹槽SP5R1設置於第一移位促進區域SP5F1中。第二移位促進凹槽SP5R2設置於第二移位促進區域SP5F2中。然而，第一移位促進區域SP5F1可包括另一結構來替代或補充第一移位促進凹槽SP5R1。第二移位促進區域SP5F2可包括另一結構來替代或補充第二移位促進凹槽SP5R2。 如圖12中所見，額外鏈輪SP6包括鏈輪主體SP6A及複數個鏈輪齒SP6B。複數個鏈輪齒SP6B相對於自行車後鏈輪總成14之旋轉中心軸線A1自鏈輪主體SP6A徑向向外延伸。在此實施例中，至少一個鏈輪齒SP6B之總數目為21。然而，額外鏈輪SP6之複數個鏈輪齒SP6B的總數目不限於此實施例。 額外鏈輪SP6包括至少一個第一移位促進區域SP6F1以促進自行車鏈20自額外鏈輪SP6移位至相鄰更小鏈輪SP5之第一移位操作。額外鏈輪SP6包括至少一個第二移位促進區域SP6F2以促進自行車鏈20自相鄰更小鏈輪SP5移位至額外鏈輪SP6之第二移位操作。相鄰更小鏈輪SP5相對於自行車後鏈輪總成14之旋轉中心軸線A1在軸向方向D2上鄰近於額外鏈輪SP6，而在額外鏈輪SP6與相鄰更小鏈輪SP5之間無另一鏈輪。在此實施例中，額外鏈輪SP6包括用以促進第一移位操作之複數個第一移位促進區域SP6F1。額外鏈輪SP6包括用以促進第二移位操作之複數個第二移位促進區域SP6F2。然而，第一移位促進區域SP6F1之總數目不限於此實施例。第二移位促進區域SP6F2之總數目不限於此實施例。 在此實施例中，額外鏈輪SP6包括用以促進第一移位操作之複數個第一移位促進凹槽SP6R1。額外鏈輪SP6包括用以促進第二移位操作之複數個第二移位促進凹槽SP6R2。第一移位促進凹槽SP6R1設置於第一移位促進區域SP6F1中。第二移位促進凹槽SP6R2設置於第二移位促進區域SP6F2中。然而，第一移位促進區域SP6F1可包括另一結構來替代或補充第一移位促進凹槽SP6R1。第二移位促進區域SP6F2可包括另一結構來替代或補充第二移位促進凹槽SP6R2。 如圖13中所見，額外鏈輪SP7包括鏈輪主體SP7A及複數個鏈輪齒SP7B。複數個鏈輪齒SP7B相對於自行車後鏈輪總成14之旋轉中心軸線A1自鏈輪主體SP7A徑向向外延伸。在此實施例中，至少一個鏈輪齒SP7B之總數目為24。然而，額外鏈輪SP7之複數個鏈輪齒SP7B的總數目不限於此實施例。 額外鏈輪SP7包括至少一個第一移位促進區域SP7F1以促進自行車鏈20自額外鏈輪SP7移位至相鄰更小鏈輪SP6之第一移位操作。額外鏈輪SP7包括至少一個第二移位促進區域SP7F2以促進自行車鏈20自相鄰更小鏈輪SP6移位至額外鏈輪SP7之第二移位操作。相鄰更小鏈輪SP6相對於自行車後鏈輪總成14之旋轉中心軸線A1在軸向方向D2上鄰近於額外鏈輪SP7，而在額外鏈輪SP7與相鄰更小鏈輪SP6之間無另一鏈輪。在此實施例中，額外鏈輪SP7包括用以促進第一移位操作之複數個第一移位促進區域SP7F1。額外鏈輪SP7包括用以促進第二移位操作之複數個第二移位促進區域SP7F2。然而，第一移位促進區域SP7F1之總數目不限於此實施例。第二移位促進區域SP7F2之總數目不限於此實施例。 在此實施例中，額外鏈輪SP7包括用以促進第一移位操作之複數個第一移位促進凹槽SP7R1。額外鏈輪SP7包括用以促進第二移位操作之複數個第二移位促進凹槽SP7R2。第一移位促進凹槽SP7R1設置於第一移位促進區域SP7F1中。第二移位促進凹槽SP7R2設置於第二移位促進區域SP7F2中。然而，第一移位促進區域SP7F1可包括另一結構來替代或補充第一移位促進凹槽SP7R1。第二移位促進區域SP7F2可包括另一結構來替代或補充第二移位促進凹槽SP7R2。 如圖14中所見，額外鏈輪SP8包括鏈輪主體SP8A及複數個鏈輪齒SP8B。複數個鏈輪齒SP8B相對於自行車後鏈輪總成14之旋轉中心軸線A1自鏈輪主體SP8A徑向向外延伸。在此實施例中，至少一個鏈輪齒SP8B之總數目為28。然而，額外鏈輪SP8之複數個鏈輪齒SP8B的總數目不限於此實施例。 額外鏈輪SP8包括至少一個第一移位促進區域SP8F1以促進自行車鏈20自額外鏈輪SP8移位至相鄰更小鏈輪SP7之第一移位操作。額外鏈輪SP8包括至少一個第二移位促進區域SP8F2以促進自行車鏈20自相鄰更小鏈輪SP7移位至額外鏈輪SP8之第二移位操作。相鄰更小鏈輪SP7相對於自行車後鏈輪總成14之旋轉中心軸線A1在軸向方向D2上鄰近於額外鏈輪SP8，而在額外鏈輪SP8與相鄰更小鏈輪SP7之間無另一鏈輪。在此實施例中，額外鏈輪SP8包括用以促進第一移位操作之複數個第一移位促進區域SP8F1。額外鏈輪SP8包括用以促進第二移位操作之複數個第二移位促進區域SP8F2。然而，第一移位促進區域SP8F1之總數目不限於此實施例。第二移位促進區域SP8F2之總數目不限於此實施例。 在此實施例中，額外鏈輪SP8包括用以促進第一移位操作之複數個第一移位促進凹槽SP8R1。額外鏈輪SP8包括用以促進第二移位操作之複數個第二移位促進凹槽SP8R2。第一移位促進凹槽SP8R1設置於第一移位促進區域SP8F1中。第二移位促進凹槽SP8R2設置於第二移位促進區域SP8F2中。然而，第一移位促進區域SP8F1可包括另一結構來替代或補充第一移位促進凹槽SP8R1。第二移位促進區域SP8F2可包括另一結構來替代或補充第二移位促進凹槽SP8R2。 如圖15中所見，額外鏈輪SP9包括鏈輪主體SP9A及複數個鏈輪齒SP9B。複數個鏈輪齒SP9B相對於自行車後鏈輪總成14之旋轉中心軸線A1自鏈輪主體SP9A徑向向外延伸。在此實施例中，至少一個鏈輪齒SP9B之總數目為33。然而，額外鏈輪SP9之複數個鏈輪齒SP9B的總數目不限於此實施例。 額外鏈輪SP9包括至少一個第一移位促進區域SP9F1以促進自行車鏈20自額外鏈輪SP9移位至相鄰更小鏈輪SP8之第一移位操作。額外鏈輪SP9包括至少一個第二移位促進區域SP9F2以促進自行車鏈20自相鄰更小鏈輪SP8移位至額外鏈輪SP9之第二移位操作。相鄰更小鏈輪SP8相對於自行車後鏈輪總成14之旋轉中心軸線A1在軸向方向D2上鄰近於額外鏈輪SP9，而在額外鏈輪SP9與相鄰更小鏈輪SP8之間無另一鏈輪。在此實施例中，額外鏈輪SP9包括用以促進第一移位操作之複數個第一移位促進區域SP9F1。額外鏈輪SP9包括用以促進第二移位操作之複數個第二移位促進區域SP9F2。然而，第一移位促進區域SP9F1之總數目不限於此實施例。第二移位促進區域SP9F2之總數目不限於此實施例。 在此實施例中，額外鏈輪SP9包括用以促進第一移位操作之複數個第一移位促進凹槽SP9R1。額外鏈輪SP9包括用以促進第二移位操作之複數個第二移位促進凹槽SP9R2。第一移位促進凹槽SP9R1設置於第一移位促進區域SP9F1中。第二移位促進凹槽SP9R2設置於第二移位促進區域SP9F2中。然而，第一移位促進區域SP9F1可包括另一結構來替代或補充第一移位促進凹槽SP9R1。第二移位促進區域SP9F2可包括另一結構來替代或補充第二移位促進凹槽SP9R2。 如圖16中所見，額外鏈輪SP10包括鏈輪主體SP10A及複數個鏈輪齒SP10B。複數個鏈輪齒SP10B相對於自行車後鏈輪總成14之旋轉中心軸線A1自鏈輪主體SP10A徑向向外延伸。在此實施例中，至少一個鏈輪齒SP10B之總數目為39。然而，額外鏈輪SP10之複數個鏈輪齒SP10B的總數目不限於此實施例。 額外鏈輪SP10包括至少一個第一移位促進區域SP10F1以促進自行車鏈20自額外鏈輪SP10移位至相鄰更小鏈輪SP9之第一移位操作。額外鏈輪SP10包括至少一個第二移位促進區域SP10F2以促進自行車鏈20自相鄰更小鏈輪SP9移位至額外鏈輪SP10之第二移位操作。相鄰更小鏈輪SP9相對於自行車後鏈輪總成14之旋轉中心軸線A1在軸向方向D2上鄰近於額外鏈輪SP10，而在額外鏈輪SP10與相鄰更小鏈輪SP9之間無另一鏈輪。在此實施例中，額外鏈輪SP10包括用以促進第一移位操作之複數個第一移位促進區域SP10F1。額外鏈輪SP10包括用以促進第二移位操作之複數個第二移位促進區域SP10F2。然而，第一移位促進區域SP10F1之總數目不限於此實施例。第二移位促進區域SP10F2之總數目不限於此實施例。 在此實施例中，額外鏈輪SP10包括用以促進第一移位操作之複數個第一移位促進凹槽SP10R1。額外鏈輪SP10包括用以促進第二移位操作之複數個第二移位促進凹槽SP10R2。第一移位促進凹槽SP10R1設置於第一移位促進區域SP10F1中。第二移位促進凹槽SP10R2設置於第二移位促進區域SP10F2中。然而，第一移位促進區域SP10F1可包括另一結構來替代或補充第一移位促進凹槽SP10R1。第二移位促進區域SP10F2可包括另一結構來替代或補充第二移位促進凹槽SP10R2。 如圖17中所見，額外鏈輪SP11包括鏈輪主體SP11A及複數個鏈輪齒SP11B。複數個鏈輪齒SP11B相對於自行車後鏈輪總成14之旋轉中心軸線A1自鏈輪主體SP11A徑向向外延伸。在此實施例中，至少一個鏈輪齒SP11B之總數目為45。然而，額外鏈輪SP11之複數個鏈輪齒SP11B的總數目不限於此實施例。 額外鏈輪SP11包括至少一個第一移位促進區域SP11F1以促進自行車鏈20自額外鏈輪SP11移位至相鄰更小鏈輪SP10之第一移位操作。額外鏈輪SP11包括至少一個第二移位促進區域SP11F2以促進自行車鏈20自相鄰更小鏈輪SP10移位至額外鏈輪SP11之第二移位操作。相鄰更小鏈輪SP10相對於自行車後鏈輪總成14之旋轉中心軸線A1在軸向方向D2上鄰近於額外鏈輪SP11，而在額外鏈輪SP11與相鄰更小鏈輪SP10之間無另一鏈輪。在此實施例中，額外鏈輪SP11包括用以促進第一移位操作之複數個第一移位促進區域SP11F1。額外鏈輪SP11包括用以促進第二移位操作之複數個第二移位促進凹槽區域SP11F2。然而，第一移位促進區域SP11F1之總數目不限於此實施例。第二移位促進區域SP11F2之總數目不限於此實施例。 在此實施例中，額外鏈輪SP11包括用以促進第一移位操作之複數個第一移位促進凹槽SP11R1。額外鏈輪SP11包括用以促進第二移位操作之複數個第二移位促進凹槽SP11R2。第一移位促進凹槽SP11R1設置於第一移位促進區域SP11F1中。第二移位促進凹槽SP11R2設置於第二移位促進區域SP11F2中。然而，第一移位促進區域SP11F1可包括另一結構來替代或補充第一移位促進凹槽SP11R1。第二移位促進區域SP11F2可包括另一結構來替代或補充第二移位促進凹槽SP11R2。 如圖18中所見，額外鏈輪SP12包括鏈輪主體SP12A及複數個鏈輪齒SP12B。複數個鏈輪齒SP12B相對於自行車後鏈輪總成14之旋轉中心軸線A1自鏈輪主體SP12A徑向向外延伸。額外鏈輪SP12之總齒數等於或大於46。額外鏈輪SP12之總齒數亦可等於或大於50。額外鏈輪SP12之總齒數在此實施例中為51。然而，額外鏈輪SP12之至少一個鏈輪齒SP12B之總數目不限於此實施例及以上範圍。 額外鏈輪SP12包括至少一個第一移位促進區域SP12F1以促進自行車鏈20自額外鏈輪SP12移位至相鄰更小鏈輪SP11之第一移位操作。額外鏈輪SP12包括至少一個第二移位促進區域SP12F2以促進自行車鏈20自相鄰更小鏈輪SP11移位至額外鏈輪SP12之第二移位操作。相鄰更小鏈輪SP11相對於自行車後鏈輪總成14之旋轉中心軸線A1在軸向方向D2上鄰近於額外鏈輪SP12，而在額外鏈輪SP12與相鄰更小鏈輪SP11之間無另一鏈輪。在此實施例中，額外鏈輪SP12包括用以促進第一移位操作之複數個第一移位促進區域SP12F1。額外鏈輪SP12包括用以促進第二移位操作之複數個第二移位促進區域SP12F2。然而，第一移位促進區域SP12F1之總數目不限於此實施例。第二移位促進區域SP12F2之總數目不限於此實施例。 在此實施例中，額外鏈輪SP12包括用以促進第一移位操作之複數個第一移位促進凹槽SP12R1。額外鏈輪SP12包括用以促進第二移位操作之複數個第二移位促進凹槽SP12R2。第一移位促進凹槽SP12R1設置於第一移位促進區域SP12F1中。第二移位促進凹槽SP12R2設置於第二移位促進區域SP12F2中。然而，第一移位促進區域SP12F1可包括另一結構來替代或補充第一移位促進凹槽SP12R1。第二移位促進區域SP12F2可包括另一結構來替代或補充第二移位促進凹槽SP12R2。 如圖19中所見，鏈輪SP1至SP12為彼此分開的構件。然而，鏈輪SP1至SP12中之至少一者可與鏈輪SP1至SP12中之另一至少部分地整體設置。所有鏈輪SP1至SP12可與彼此一體成型為單件式整體單元。在此狀況下，鏈輪SP3至SP12中之至少一者可包括至少十個內部花鍵齒。 自行車後鏈輪總成14進一步包含鏈輪支撐構件37、複數個間隔件38、第一環39A及第二環39B。第一環39A在軸向方向D2上設置於第二鏈輪SP3與第二鏈輪SP4之間。第二環39B在軸向方向D2上設置於第二鏈輪SP4與額外鏈輪SP5之間。額外鏈輪經構形以附接至鏈輪支撐構件37。在此實施例中額外鏈輪SP5至SP12經構形以附接至鏈輪支撐構件37。 如圖6中所見，舉例而言，額外鏈輪藉由黏附劑37A附接至鏈輪支撐構件37。在此實施例中，額外鏈輪SP5至SP12藉由黏附劑37A附接至鏈輪支撐構件37。因此，有可能藉由減少或消除金屬緊固件來減輕自行車後鏈輪總成14之重量。然而，額外鏈輪SP5至SP12中之至少一者可藉由除黏附劑37A以外之另一結構(包括金屬緊固件)附接至鏈輪支撐構件37。額外鏈輪SP5至SP12中之至少一者可在無鏈輪支撐構件37之情況下與鏈輪支撐主體28嚙合。鏈輪支撐構件37可自自行車後鏈輪總成14省略。另外，第二鏈輪SP3及SP4中之至少一者可附接至鏈輪支撐構件37。 如圖4中所見，鎖定構件32包括管狀主體32A、外螺紋部分32B及徑向突出物32C。管狀主體32A包括第一軸向端32D及第二軸向端32E。相對於自行車後鏈輪總成14之旋轉中心軸線A1，第二軸向端32E在軸向方向D2上與第一軸向端32D相對。如圖6中所見，在自行車後鏈輪總成14安裝至自行車後輪轂總成12之狀態下，第一軸向端32D經定位成比第二軸向端32E更接近自行車後輪轂總成12之軸向中心平面CPL。軸向中心平面CPL垂直於旋轉中心軸線A1。如圖3中所見，軸向中心平面CPL經界定以在軸向方向D2上平分自行車後輪轂總成12之軸向長度。 如圖6中所見，外螺紋部分32B提供至第一軸向端32D，以在自行車後鏈輪總成14安裝至自行車後輪轂總成12之狀態下與自行車後輪轂總成12之鏈輪支撐主體28的內螺紋部分28A嚙合。徑向突出物32C相對於旋轉中心軸線A1自第二軸向端32E徑向向外延伸，以在自行車後鏈輪總成14安裝至自行車後輪轂總成12之狀態下限制第一鏈輪SP2相對於自行車後輪轂總成12之鏈輪支撐主體28的軸向移動。 第一鏈輪SP1包括第一向內側SP1G及第一向外側SP1H。第一向外側SP1H在軸向方向D2上與第一向內側SP1G相對。徑向突出物32C經構形以在第一向外側SP1H中鄰接第一鏈輪SP1。第一鏈輪SP1及SP2該軸向方向上安置於徑向突出物32C與第二鏈輪SP3之間。第一鏈輪SP1及SP2、第二鏈輪SP3、第二鏈輪SP4及第一環39A在軸向方向D2上固持於徑向突出物32C與鏈輪支撐構件37之間。 如圖4中所見，鎖定構件32具有工具嚙合部分32F。工具嚙合部分32F設置於管狀主體32A之內部周邊表面32A1上以與緊固工具(未展示)嚙合。在此實施例中，工具嚙合部分32F包括複數個嚙合凹槽32G，嚙合凹槽32G將在鎖定構件32藉由外螺紋部分32B及內螺紋部分28A以螺紋方式附接至鏈輪支撐主體28時與緊固工具嚙合。 如圖20及圖21中所見，鏈輪支撐主體28包括經構形以與自行車後鏈輪總成14 (圖6)嚙合之至少一個外部花鍵齒40。鏈輪支撐主體28包括經構形以與自行車後鏈輪總成14 (圖6)嚙合之至少十個外部花鍵齒40。亦即，至少一個外部花鍵齒40包括複數個外部花鍵齒40。 鏈輪支撐主體28包括具有管狀形狀之基座支撐件41。基座支撐件41沿旋轉中心軸線A1延伸。外部花鍵齒40自基座支撐件41徑向向外延伸。鏈輪支撐主體28包括較大直徑部分42、凸緣44及複數個螺旋外部花鍵齒46。較大直徑部分42及凸緣44自基座支撐件41徑向向外延伸。較大直徑部分42在軸向方向D2上設置於複數個外部花鍵齒40與凸緣44之間。較大直徑部分42及凸緣44在軸向方向D2上設置於複數個外部花鍵齒40與複數個螺旋外部花鍵齒46之間。如圖6中所見，自行車後鏈輪總成14在軸向方向D2上固持於較大直徑部分42與鎖定構件32之徑向突出物32C之間。較大直徑部分42可具有內部空腔，使得諸如單向聯軸結構之傳動結構可容納於內部空腔內。根據需要，可自自行車後輪轂總成12省略較大直徑部分42。 如圖22中所見，至少十個外部花鍵齒40中之至少一者具有軸向花鍵齒長度SL1。外部花鍵齒40中之每一者具有軸向花鍵齒長度SL1。軸向花鍵齒長度SL1等於或小於27 mm。軸向花鍵齒長度SL1等於或大於22 mm。在此實施例中，軸向花鍵齒長度SL1為24.9 mm。然而，軸向花鍵齒長度SL1不限於此實施例及以上範圍。 如圖23中所見，至少十個外部花鍵齒40之總數目等於或大於20。至少十個外部花鍵齒40之總數目較佳地等於或大於25。至少十個外部花鍵齒40之總數目較佳地等於或大於28。外部花鍵齒40之總數目較佳地等於或小於72。在此實施例中，外部花鍵齒40之總數目為29。然而，外部花鍵齒40之總數目不限於此實施例及以上範圍。 至少十個外部花鍵齒40具有第一外部周節角PA11及第二外部周節角PA12。至少十個外部花鍵齒40中之至少兩個外部花鍵齒相對於旋轉中心軸線A1按第一外部周節角PA11沿圓周配置。換言之，複數個外部花鍵齒40中之至少兩者相對於自行車後輪轂總成12之旋轉中心軸線A1按第一外部周節角PA11沿圓周配置。至少十個外部花鍵齒40中之至少兩個外部花鍵齒相對於自行車後輪轂總成12之旋轉中心軸線A1按第二外部周節角PA12沿圓周配置。換言之，複數個外部花鍵齒40中之至少兩者相對於自行車後輪轂總成12之旋轉中心軸線A1按第二外部周節角PA12沿圓周配置。在此實施例中，第二外部周節角PA12不同於第一外部周節角PA11。然而，第二外部周節角PA12可大體上等於第一外部周節角PA11。 在此實施例中，外部花鍵齒40為在圓周方向D1上按第一外部周節角PA11配置。外部花鍵齒40中之兩個外部花鍵齒為在圓周方向D1上按第二外部周節角PA12配置。然而，外部花鍵齒40中之至少兩個外部花鍵齒可在圓周方向D1上以另一外部周節角配置。 第一外部周節角PA11範圍介於5度至36度。第一外部周節角PA11較佳地範圍介於10度至20度。第一外部周節角PA11較佳地等於或小於15度。在此實施例中，第一外部周節角PA11為12度。然而，第一外部周節角PA11不限於此實施例及以上範圍。 第二外部周節角PA12範圍介於5度至36度。在此實施例中，第二外部周節角PA12為24度。然而，第二外部周節角PA12不限於此實施例及以上範圍。 外部花鍵齒40中之至少一者可不同於外部花鍵齒40中之另一者之第二花鍵形狀的第一花鍵形狀。至少十個外部花鍵齒40中之至少一者可具有不同於至少十個外部花鍵齒40中之另一者之第二花鍵大小的第一花鍵大小。當沿旋轉中心軸線A1檢視時，外部花鍵齒40中之至少一者具有不同於外部花鍵齒40中之另一者之輪廓的輪廓。在此實施例中，外部花鍵齒40X具有不同於外部花鍵齒40中之另一者之第二花鍵形狀的第一花鍵形狀。外部花鍵齒40X具有不同於外部花鍵齒40中之另一者之第二花鍵大小的第一花鍵大小。然而，如圖24中所見，至少十個外部花鍵齒40可彼此具有相同花鍵形狀。至少十個外部花鍵齒40可彼此具有相同花鍵大小。至少十個外部花鍵齒40可彼此具有相同輪廓。 如圖25中所見，至少十個外部花鍵齒40中之每一者具有外部花鍵傳動表面48及外部花鍵非傳動表面50。複數個外部花鍵齒40包括用以在踩踏期間接收來自自行車後鏈輪總成14 (圖6)之傳動旋轉力F1的複數個外部花鍵傳動表面48。複數個外部花鍵齒40包括複數個外部花鍵非傳動表面50。外部花鍵傳動表面48可與自行車後鏈輪總成14接觸以在踩踏期間接收來自自行車後鏈輪總成14 (圖6)之傳動旋轉力F1。外部花鍵傳動表面48面向反向旋轉方向D12。在自行車後鏈輪總成14安裝至自行車後輪轂總成12之狀態下，外部花鍵傳動表面48面向自行車後鏈輪總成14之內部花鍵傳動表面66。外部花鍵非傳動表面50在圓周方向D1上設置於外部花鍵傳動表面48之反向側上。外部花鍵非傳動表面50面向傳動旋轉方向D11，從而在踩踏期間不接收來自自行車後鏈輪總成14之傳動旋轉力F1。在自行車後鏈輪總成14安裝至自行車後輪轂總成12之狀態下，外部花鍵非傳動表面50面向自行車後鏈輪總成14之內部花鍵非傳動表面68。 至少十個外部花鍵齒40分別具有圓周最大寬度MW1。外部花鍵齒40分別具有圓周最大寬度MW1。圓周最大寬度MW1定義為接收施加至外部花鍵齒40之推力F2的最大寬度。圓周最大寬度MW1定義為基於外部花鍵傳動表面48之直線距離。 複數個外部花鍵傳動表面48各自包括徑向最外邊緣48A及徑向最內邊緣48B。外部花鍵傳動表面48自徑向最外邊緣48A延伸至徑向最內邊緣48B。第一參考圓RC11界定於徑向最內邊緣48B上且以旋轉中心軸線A1為中心。第一參考圓RC11在參考點50R處與外部花鍵非傳動表面50相交。圓周最大寬度MW1在圓周方向D1上自徑向最內邊緣48B直線延伸至參考點50R。 複數個外部花鍵非傳動表面50各自包括徑向最外邊緣50A及徑向最內邊緣50B。外部花鍵非傳動表面50自徑向最外邊緣50A延伸至徑向最內邊緣50B。在此實施例中，參考點50R與徑向最內邊緣50B重合。然而，參考點50R可自徑向最內邊緣50B偏移。 圓周最大寬度MW1之總和等於或大於55 mm。圓周最大寬度MW1之總和較佳地等於或大於60 mm。圓周最大寬度MW1之總和較佳地等於或小於70 mm。在此實施例中，圓周最大寬度MW1之總和為60.1 mm。然而，圓周最大寬度MW1之總和不限於此實施例及以上範圍。 如圖26中所見，至少一個外部花鍵齒40具有等於或小於34 mm之外部花鍵頂徑DM11。外部花鍵頂徑DM11等於或小於33 mm。外部花鍵頂徑DM11等於或大於29 mm。在此實施例中，外部花鍵頂徑DM11為32.6 mm。然而，外部花鍵頂徑DM11不限於此實施例及以上範圍。 至少一個外部花鍵齒40具有外部花鍵底徑DM12。至少一個外部花鍵齒40具有外部花鍵齒根圓RC12，外部花鍵齒根圓RC12具有外部花鍵底徑DM12。然而，外部花鍵齒根圓RC12可具有不同於外部花鍵底徑DM12之另一直徑。外部花鍵底徑DM12等於或小於32 mm。外部花鍵底徑DM12等於或小於31 mm。外部花鍵底徑DM12等於或大於28 mm。在此實施例中，外部花鍵底徑DM12為30.2 mm。然而，外部花鍵底徑DM12不限於此實施例及以上範圍。 較大直徑部分42具有大於外部花鍵頂徑DM11之外徑DM13。外徑DM13範圍介於32 mm至40 mm。在此實施例中，外徑DM13為35 mm。然而，外徑DM13不限於此實施例。 如圖25中所見，複數個外部花鍵傳動表面48各自包括自徑向最外邊緣48A至徑向最內邊緣48B界定之徑向長度RL11。複數個外部花鍵傳動表面48之徑向長度RL11的總和等於或大於7 mm。徑向長度RL11之總和等於或大於10 mm。徑向長度RL11之總等於或大於15 mm。徑向長度RL11之總和等於或小於36 mm。在此實施例中，徑向長度RL11之總和為16.6 mm。然而，徑向長度RL11之總和不限於此實施例。 複數個外部花鍵齒40具有額外徑向長度RL12。額外徑向長度RL12分別自外部花鍵齒根圓RC12至複數個外部花鍵齒40之徑向最外端40A界定。額外徑向長度RL12之總和等於或大於20 mm。在此實施例中，額外徑向長度RL12之總和為31.2 mm。然而，額外徑向長度RL12之總和不限於此實施例。 至少十個外部花鍵齒40中之至少一者相對於參考線CL1沿圓周對稱。相對於旋轉中心軸線A1在徑向方向上，參考線CL1自旋轉中心軸線A1延伸至至少十個外部花鍵齒40中之該至少一者之徑向最外端40A的圓周中心點CP1。然而，外部花鍵齒40中之至少一者可相對於參考線CL1具有不對稱形狀。至少十個外部花鍵齒40中之該至少一者包含外部花鍵傳動表面48及外部花鍵非傳動表面50。 複數個外部花鍵傳動表面48中之至少一個表面具有第一外部花鍵表面角AG11。第一外部花鍵表面角AG11界定於外部花鍵傳動表面48與第一徑向線L11之間。第一徑向線L11自自行車後輪轂總成12之旋轉中心軸線A1延伸至外部花鍵傳動表面48之徑向最外邊緣48A。第一外部周節角PA11或第二外部周節角PA12界定於鄰近第一徑向線L11 (見例如圖23)之間。 外部花鍵非傳動表面50中之至少一者具有第二外部花鍵表面角AG12。第二外部花鍵表面角AG12界定於外部花鍵非傳動表面50與第二徑向線L12之間。第二徑向線L12自自行車後輪轂總成12之旋轉中心軸線A1延伸至外部花鍵非傳動表面50之徑向最外邊緣50A。 在此實施例中，第二外部花鍵表面角AG12等於第一外部花鍵表面角AG11。然而，第一外部花鍵表面角AG11可不同於第二外部花鍵表面角AG12。 第一外部花鍵表面角AG11等於或小於6度。第一外部花鍵表面角AG11等於或大於0度。第二外部花鍵表面角AG12等於或小於6度。第二外部花鍵表面角AG12等於或大於0度。在此實施例中，第一外部花鍵表面角AG11為5度。第二外部花鍵表面角AG12為5度。然而，第一外部花鍵表面角AG11及第二外部花鍵表面角AG12不限於此實施例及以上範圍。 如圖27及圖28中所見，制動轉子支撐主體34包括經構形以與自行車制動轉子16 (圖1)嚙合之至少一個額外外部花鍵齒52。在此實施例中，制動轉子支撐主體34包括額外基座支撐件54及複數個額外外部花鍵齒52。額外基座支撐件54具有管狀形狀且沿著旋轉中心軸線A1自輪轂主體36延伸。額外外部花鍵齒52自額外基座支撐件54徑向向外延伸。額外外部花鍵齒52之總數目為52。然而，額外外部花鍵齒52之總數目不限於此實施例。 如圖28中所見，至少一個額外外部花鍵齒52具有額外外部花鍵頂徑DM14。如圖29中所見，額外外部花鍵頂徑DM14大於外部花鍵頂徑DM11。額外外部花鍵頂徑DM14大體上等於較大直徑部分42之外徑DM13。然而，額外外部花鍵頂徑DM14可等於或小於外部花鍵頂徑DM11。額外外部花鍵頂徑DM14可不同於較大直徑部分42之外徑DM13。 如圖29中所見，輪轂主體36包括第一輪輻安裝部分36A及第二輪輻安裝部分36B。複數個第一輪輻SK1耦接至第一輪輻安裝部分36A。複數個第二輪輻SK2耦接至第二輪輻安裝部分36B。在此實施例中，第一輪輻安裝部分36A包括複數個第一附接孔36A1。第一輪輻SK1延伸穿過第一附接孔36A1。第二輪輻安裝部分36B包括複數個第二附接孔36B1。第二輪輻SK2延伸穿過第二附接孔36B1。如本文中所使用，術語「輪輻安裝部分」涵蓋輪輻安裝開口具有凸緣狀形狀以使得輪輻安裝部分相對於如圖29中所見之自行車後輪轂總成之旋轉中心軸線徑向向外延伸的構形，及輪輻安裝部分為直接形成於輪轂主體之徑向外周邊表面上之開口的構形。 第二輪輻安裝部分36B在軸向方向D2上與第一輪輻安裝部分36A間隔開。第一輪輻安裝部分36A在軸向方向D2上設置於鏈輪支撐主體28與第二輪輻安裝部分36B之間。第二輪輻安裝部分36B在軸向方向D2上設置於第一輪輻安裝部分36A與制動轉子支撐主體34之間。 第一輪輻安裝部分36A具有第一軸向最外部分36C。第二輪輻安裝部分36B具有第二軸向最外部分36D。第一軸向最外部分36C包括在自行車後輪轂總成12安裝至自行車框架BF之狀態下在軸向方向D2上面朝向第一框架BF1之表面。第二軸向最外部分36D包括在自行車後輪轂總成12安裝至自行車框架BF之狀態下在軸向方向D2上面朝向第二框架BF2之表面。 輪轂主體36包括第一軸向長度AL1。第一軸向長度AL1相對於自行車後鏈輪總成14之旋轉中心軸線A1在軸向方向D2上界定於第一輪輻安裝部分36A之第一軸向最外部分36C與第二輪輻安裝部分36B之第二軸向最外部分36D之間。第一軸向長度AL1可等於或大於55 mm。第一軸向長度AL1可等於或大於60 mm。第一軸向長度AL1可等於或大於65 mm。在此實施例中，第一軸向長度AL1可為67 mm。然而，第一軸向長度AL1不限於此實施例及以上範圍。第一軸向長度AL1之實例包括55.7 mm、62.3 mm及67 mm。 如圖29中所見，輪轂軸30包括第一軸向框架鄰接表面30B1及第二軸向框架鄰接表面30C1。在自行車後輪轂總成12安裝至自行車框架BF之下，第一軸向框架鄰接表面30B1經構形以相對於自行車後鏈輪總成14之旋轉中心軸線A1在軸向方向D2上鄰接自行車框架BF之第一部分BF12。第二軸向框架鄰接表面30C1經構形以在自行車後輪轂總成12安裝至自行車框架BF之狀態中在軸向方向D2上鄰接自行車框架BF之第二部分BF22。相比於第二軸向框架鄰接表面30C1，第一軸向框架鄰接表面30B1經定位成在軸向方向D2上更接近鏈輪支撐主體28。鏈輪支撐主體28在軸向方向D2上設置於第一軸向框架鄰接表面30B1與第二軸向框架鄰接表面30C1之間。 輪轂軸30包括在軸向方向D2上界定於第一軸向框架鄰接表面30B1與第二軸向框架鄰接表面30C1之間的第二軸向長度AL2。第二軸向長度AL2可等於或大於140 mm。第二軸向長度AL2可等於或大於145 mm。第二軸向長度AL2可等於或大於147 mm。第二軸向長度AL2可為148 mm。然而，第二軸向長度AL2不限於此實施例及以上範圍。第二軸向長度AL2之實例包括142 mm、148 mm及157 mm。 第一軸向長度AL1與第二軸向長度AL2之比率可等於或大於0.3。第一軸向長度AL1與與第二軸向長度AL2之比率可等於或大於0.4。第一軸向長度AL1與與第二軸向長度AL2之比率可等於或大於0.5。舉例而言，第一軸向長度AL1 (67 mm)與第二軸向長度AL2 (148 mm)之比率為大致0.45。然而，第一軸向長度AL1與第二軸向長度AL2之比率不限於此實施例及以上範圍。第一軸向長度AL1與第二軸向長度AL2之比率的實例包括大致0.42 (AL1為62.3 mm且AL2為148 mm)，或包括大致0.39 (AL1為55.7 mm且AL2為142 mm)。 如圖6中所見，鏈輪支撐主體28包括第一軸向端28B、第二軸向端28C及軸向鏈輪鄰接表面28D。第二軸向端28C在軸向方向D2上與第一軸向端28B相對。軸向中心平面CPL在軸向方向D2上平分第二軸向長度AL2。軸向鏈輪鄰接表面28D經定位成在軸向方向D2上比第一軸向端28B更接近自行車後輪轂總成12之軸向中心平面CPL。第二軸向端28C經定位成在軸向方向D2上比鏈輪鄰接表面28D軸向地更接近自行車後輪轂總成12之軸向中心平面CPL。在此實施例中，軸向鏈輪鄰接表面28D設置於較大直徑部分42上，然而軸向鏈輪鄰接表面28D可根據需要設置於自行車後輪轂總成12之其他部分上。在自行車後鏈輪總成14安裝於鏈輪支撐主體28上之狀態中，軸向鏈輪鄰接表面28D與自行車後鏈輪總成14接觸。軸向鏈輪鄰接表面28D在軸向方向D2上面向第一軸向端28B。 如圖6中所見，鏈輪配置軸向長度AL3在軸向方向D2上界定於第一軸向框架鄰接表面30B1與鏈輪支撐主體28之軸向鏈輪鄰接表面28D之間。在此實施例中，鏈輪配置軸向長度AL3範圍介於35 mm至45 mm。舉例而言，鏈輪配置軸向長度AL3為39.64 mm。舉例而言，藉由省略較大直徑部分42，鏈輪配置軸向長度AL3亦可延伸直至44.25 mm。然而，鏈輪配置軸向長度AL3不限於此實施例及以上範圍。 較大直徑部分42具有在軸向方向D2上離第一軸向框架鄰接表面30B1最遠之軸向端42A。額外軸向長度AL4在軸向方向D2上自第一軸向框架鄰接表面30B1至軸向端42A界定。額外軸向長度AL4範圍介於38 mm至47 mm。額外軸向長度AL4可範圍介於44 mm至45 mm。額外軸向長度AL4亦可範圍介於40 mm至41 mm。在此實施例中，額外軸向長度AL4為44.25 mm。然而，額外軸向長度AL4不限於此實施例及以上範圍。 較大直徑部分42之較大直徑軸向長度AL5範圍介於3 mm至6 mm。在此實施例中，較大直徑軸向長度AL5為4.61 mm。然而，較大直徑軸向長度AL5不限於此實施例及以上範圍。 第一軸向長度AL1與鏈輪配置軸向長度AL3之比率範圍介於1.2至1.7。舉例而言，若第一軸向長度AL1為55.7 mm且鏈輪配置軸向長度AL3為39.64 mm，則第一軸向長度AL1與鏈輪配置軸向長度AL3之比率為1.4。然而，第一軸向長度AL1與鏈輪配置軸向長度AL3之比率不限於此實施例及以上範圍。舉例而言，若第一軸向長度AL1為62.3 mm且鏈輪配置軸向長度AL3為39.64 mm，則第一軸向長度AL1對鏈輪配置軸向長度AL3之比率可為1.57，或若第一軸向長度AL1為67 mm且鏈輪配置軸向長度AL3為39.64 mm，則第一軸向長度AL1對鏈輪配置軸向長度AL3之比率可為1.69。 如圖30中所見，鏈輪支撐構件37包括輪轂嚙合部分60及複數個支撐臂62。複數個支撐臂62自輪轂嚙合部分60徑向向外延伸。支撐臂62包括第一附接部分62A至第八附接部分62H。複數個間隔件38包括複數個第一間隔件38A、複數個第二間隔件38B、複數個第三間隔件38C、複數個第四間隔件38D、複數個第五間隔件38E、複數個第六間隔件38F及複數個第七間隔件38G。 如圖6中所見，第一間隔件38A設置於額外鏈輪SP5與SP6之間。第二間隔件38B設置於額外鏈輪SP6與SP7之間。第三間隔件38C設置於額外鏈輪SP7與SP8之間。第四間隔件38D設置於額外鏈輪SP8與SP9之間。第五間隔件38E設置於額外鏈輪SP9與SP10之間。第六間隔件38F設置於額外鏈輪SP10與SP11之間。第七間隔件38G設置於額外鏈輪SP11與SP12之間。 額外鏈輪SP6及第一間隔件38A藉由黏附劑37A附接至第一附接部分62A。額外鏈輪SP7及第二間隔件38B藉由黏附劑37A附接至第二附接部分62B。額外鏈輪SP8及第三間隔件38C藉由黏附劑37A附接至第三附接部分62C。額外鏈輪SP9及第四間隔件38D藉由黏附劑37A附接至第四附接部分62D。額外鏈輪SP10及第五間隔件38E藉由黏附劑37A附接至第五附接部分62E。額外鏈輪SP11及第六間隔件38F藉由黏附劑37A附接至第六附接部分62F。額外鏈輪SP12及第七間隔件38G藉由黏附劑37A附接至第七附接部分62G。額外鏈輪SP5及39B藉由黏附劑37A附接至第八附接部分62H。輪轂嚙合部分60、鏈輪SP1至SP4、第一環39A及第二環39B在軸向方向D2上固持於較大直徑部分42與鎖定構件32之徑向突出物32C之間。 在此實施例中，鏈輪SP1至SP12中之每一者由諸如鋁、鐵或鈦之金屬材料製成。鏈輪支撐構件37由包括樹脂材料之非金屬材料製成。第一間隔件38A至第七間隔件38G、第一環39A及第二環39B中之每一者由諸如樹脂材料之非金屬材料製成。然而，鏈輪SP1至SP12中之至少一者可至少部分地由非金屬材料製成。鏈輪支撐構件37、第一間隔件38A至第七間隔件38G、第一環39A及第二環39B中之每一者至少部分地由諸如鋁、鐵或鈦之金屬材料製成。 如圖7中所見，第一鏈輪SP1包括第一開口SP1K。第一開口SP1K具有第一最小直徑MD1。如圖31中所見，在自行車後鏈輪總成14安裝至鏈輪支撐主體28之狀態下，鎖定構件32之管狀主體32A延伸穿過第一鏈輪SP1之第一開口SP1K。在自行車後鏈輪總成14安裝至鏈輪支撐主體28之狀態下，第一鏈輪SP1之第一開口SP1K經構形以使得鎖定構件32之管狀主體32A的第一軸向端32D通過第一鏈輪SP1之第一開口SP1K。鏈輪支撐主體28之第一軸向端28B與第一鏈輪SP1之第一開口SP1K間隔開，而不延伸穿過第一開口SP1K。第一最小直徑MD1小於自行車後輪轂總成12之鏈輪支撐主體28的最小外徑MD28。在此實施例中，最小外徑MD28等於鏈輪支撐主體28之複數個外部花鍵齒40的外部花鍵底徑DM12 (圖26)。 如圖31中所見，管狀主體32A具有等於或小於27 mm之第一外徑ED1。第一外徑ED1等於或大於26 mm。徑向突出物32C具有等於或小於32 mm之第二外徑ED2。第二外徑ED2等於或大於30 mm。在此實施例中，第一外徑ED1為26.2 mm。第二外徑ED2為30.8 mm。然而，第一外徑ED1及第二外徑ED2中之至少一者不限於此實施例及以上範圍。 徑向突出物32C具有界定於軸向方向D2中之軸向寬度ED3。舉例而言，徑向突出物32C之軸向寬度ED3為2 mm。然而，軸向寬度ED3不限於此實施例。 鎖定構件32具有在軸向方向D2上自徑向突出物32C向第一軸向端32D定義之軸向長度ED4。鎖定構件32之軸向長度ED4為10 mm。然而，軸向長度ED4不限於此實施例。 如圖8中所見，第一鏈輪SP2包括第一開口SP2K。亦即，複數個第一鏈輪SP1及SP2各自包括第一開口。第一開口SP2K具有第一最小直徑MD2。如圖31中所見，在自行車後鏈輪總成14安裝至鏈輪支撐主體28之狀態下，鎖定構件32之管狀主體32A延伸穿過第一鏈輪SP2之第一開口SP2K。鏈輪支撐主體28之第一軸向端28B與第一鏈輪SP2之第一開口SP2K間隔開，而不延伸穿過第一開口SP2K。第一最小直徑MD2小於自行車後輪轂總成12之鏈輪支撐主體28的最小外徑MD28。 如圖9中所見，第二鏈輪SP3包括第二開口SP3K。第二開口SP3K具有第二最小直徑MD3。如圖31中所見，在自行車後鏈輪總成14安裝至鏈輪支撐主體28之狀態下，鎖定構件32之管狀主體32A及鏈輪支撐主體28延伸穿過第二鏈輪SP3之第二開口SP3K。鏈輪支撐主體28之第一軸向端28B在軸向方向D2上設置於第二開口SP3K與第一開口SP1K之間。鏈輪支撐主體28之第一軸向端28B在軸向方向D2上設置於第二開口SP3K與第一開口SP2K之間。第二最小直徑MD3等於或大於自行車後輪轂總成12之鏈輪支撐主體28的最小外徑MD28。 如圖10中所見，第二鏈輪SP4包括第二開口SP4K。亦即，複數個第二鏈輪SP3及SP4各自包括第二開口。第二開口SP4K具有第二最小直徑MD4。如圖31中所見，在自行車後鏈輪總成14安裝至鏈輪支撐主體28之狀態下，鏈輪支撐主體28延伸穿過第二鏈輪SP4之第二開口SP4K。鏈輪支撐主體28之第一軸向端28B在軸向方向D2上設置於第二開口SP4K與第一開口SP1K之間。第二最小直徑MD4等於或大於自行車後輪轂總成12之鏈輪支撐主體28的最小外徑MD28。 如圖32中所見，第一鏈輪SP2包括經構形以與自行車後輪轂總成12之鏈輪支撐主體28嚙合的至少十個內部花鍵齒63。至少十個內部花鍵齒63經提供至第一開口SP2K。至少十個內部花鍵齒63提供為第一鏈輪SP2之第一扭矩傳遞結構，如稍後描述。 第一鏈輪SP2之至少十個內部花鍵齒63的總數目等於或大於20。第一鏈輪SP2之至少十個內部花鍵齒63的總數目等於或大於28。內部花鍵齒63之總數目等於或小於72。在此實施例中，內部花鍵齒63之總數目為29。然而，內部花鍵齒63之總數目不限於此實施例及以上範圍。 如圖9中所見，第二鏈輪SP3包括經構形以與自行車後輪轂總成12之鏈輪支撐主體28嚙合的至少十個內部花鍵齒64。在此實施例中，第二鏈輪SP3之至少十個內部花鍵齒64將第二最小直徑MD3定義為至少十個內部花鍵齒64之內部花鍵頂徑。 第二鏈輪SP3該至少十個內部花鍵齒64之總數目等於或大於20。第二鏈輪SP3之至少十個內部花鍵齒64的總數目等於或大於28。內部花鍵齒64之總數目等於或小於72。在此實施例中，內部花鍵齒64之總數目為29。然而，內部花鍵齒64之總數目不限於此實施例及以上範圍。 如圖10中所見，第二鏈輪SP4包括經構形以與自行車後輪轂總成12之鏈輪支撐主體28嚙合的至少十個內部花鍵齒65。亦即，複數個第二鏈輪SP3及SP4各自包括經構形以與自行車後輪轂總成12之鏈輪支撐主體28嚙合的至少十個內部花鍵齒。在此實施例中，第二鏈輪SP4之至少十個內部花鍵齒65將第二最小直徑MD4定義為至少十個內部花鍵齒65之內部花鍵頂徑。 第二鏈輪SP4之至少十個內部花鍵齒65之總數目等於或大於20。第二鏈輪SP4之至少十個內部花鍵齒65的總數目等於或大於28。內部花鍵齒65之總數目等於或小於72。在此實施例中，內部花鍵齒65之總數目為29。然而，內部花鍵齒65之總數目不限於此實施例及以上範圍。 如圖33中所見，第二鏈輪SP3之至少十個內部花鍵齒64具有第一內部周節角PA21及第二內部周節角PA22。第二鏈輪SP3之至少十個內部花鍵齒64中的至少兩個內部花鍵齒相對於自行車後鏈輪總成14之旋轉中心軸線A1按第一內部周節角PA21沿圓周配置。至少十個內部花鍵齒64中之至少兩個內部花鍵齒在圓周方向D1上彼此鄰接，而在其間無另一花鍵齒。換言之，複數個內部花鍵齒64中之至少兩者相對於自行車後鏈輪總成14之旋轉中心軸線A1按第一內部周節角PA21沿圓周配置。第二鏈輪SP3之至少十個內部花鍵齒64中的至少其他兩個內部花鍵齒相對於旋轉中心軸線A1按第二內部周節角PA22沿圓周配置。第二鏈輪SP3之至少十個花鍵齒64中的至少其他兩個內部花鍵齒在圓周方向D1上彼此鄰接，而在其間無另一花鍵齒。換言之，第二鏈輪SP3之複數個內部花鍵齒64中之至少兩者相對於旋轉中心軸線A1按第二內部周節角PA22沿圓周配置。在此實施例中，第二內部周節角PA22不同於第一內部周節角PA21。然而，第二內部周節角PA22可大體上等於第一內部周節角PA21。 在此實施例中，內部花鍵齒64在圓周方向D1上按第一內部周節角PA21沿圓周配置。內部花鍵齒64中之兩個內部花鍵齒為在圓周方向D1上按第二內部周節角PA22配置。然而，內部花鍵齒64中之至少兩個內部花鍵齒可在圓周方向D1上以另一內部周節角配置。 第一內部周節角PA21範圍介於5度至36度。第一內部周節角PA21範圍介於10度至20度。第一內部周節角PA21等於或小於15度。在此實施例中，舉例而言，第一內部周節角PA21為12度。然而，第一內部周節角PA21不限於此實施例及以上範圍。 第二內部周節角PA22範圍介於5度至36度。在此實施例中，第二內部周節角PA22為24度。然而，第二內部周節角PA22不限於此實施例及以上範圍。 第二鏈輪SP3之至少十個內部花鍵齒64中之至少一者具有不同於至少十個內部花鍵齒64中之另一者之第二花鍵形狀的第一花鍵形狀。第二鏈輪SP3之至少十個內部花鍵齒64中之至少一者具有不同於至少十個內部花鍵齒64中之另一者之第二花鍵大小的第一花鍵大小。至少十個內部花鍵齒64中之至少一者具有不同於至少十個內部花鍵齒64中之另一者之橫截面形狀的橫截面形狀。然而，如圖34中所見，內部花鍵齒64可具有彼此相同的形狀。至少十個內部花鍵齒64可具有彼此相同的大小。至少十個內部花鍵齒64可具有彼此相同的橫截面形狀。 如圖35中所見，至少十個內部花鍵齒64中之至少一者包括內部花鍵傳動表面66。至少十個內部花鍵齒64中之至少一者包括內部花鍵非傳動表面68。至少十個內部花鍵齒64包括複數個內部花鍵傳動表面66以在踩踏期間接收來自自行車後輪轂總成12 (圖6)之傳動旋轉力F1。至少十個內部花鍵齒64包括複數個內部花鍵非傳動表面68。內部花鍵傳動表面66可與鏈輪支撐主體28接觸以在踩踏期間將傳動旋轉力F1自鏈輪SP1傳遞至鏈輪支撐主體28。內部花鍵傳動表面66面向傳動旋轉方向D11。在自行車後鏈輪總成14安裝至自行車後輪轂總成12之狀態下，內部花鍵傳動表面66面向自行車後輪轂總成12之內部花鍵傳動表面48。內部花鍵非傳動表面68在圓周方向D1上設置於內部花鍵傳動表面66之反向側上。內部花鍵非傳動表面68面向反向旋轉方向D12，從而在踩踏期間不將傳動旋轉力F1自鏈輪SP1傳遞至鏈輪支撐主體28。在自行車後鏈輪總成14安裝至自行車後輪轂總成12之狀態下，外部花鍵非傳動表面68面向自行車後輪轂總成12之內部花鍵非傳動表面50。 至少十個內部花鍵齒64分別具有圓周最大寬度MW2。內部花鍵齒64分別具有圓周最大寬度MW2。圓周最大寬度MW2定義為接收施加至內部花鍵齒64之推力F3的最大寬度。圓周最大寬度MW2定義為基於內部花鍵傳動表面66之直線距離。 複數個內部花鍵傳動表面66各自包括徑向最外邊緣66A及徑向最內邊緣66B。第二參考圓RC21界定於徑向最外邊緣66A上且以旋轉中心軸線A1為中心。第二參考圓RC21在參考點68R處與內部花鍵非傳動表面68相交。圓周最大寬度MW2在圓周方向D1上自徑向最內邊緣66B直線延伸至參考點68R。 內部花鍵非傳動表面68包括徑向最外邊緣68A及徑向最內邊緣68B。內部花鍵非傳動表面68自徑向最外邊緣68A延伸至徑向最內邊緣68B。參考點68R設置於徑向最外邊緣68A與徑向最內邊緣68B之間。 圓周最大寬度MW2之總和等於或大於40 mm。圓周最大寬度MW2之總和可等於或大於45 mm。圓周最大寬度MW2之總和可等於或大於50 mm。在此實施例中，圓周最大寬度MW2之總和為50.8 mm。然而，圓周最大寬度MW2之總和不限於此實施例。 如圖36中所見，第二鏈輪SP3之至少十個內部花鍵齒64具有內部花鍵底徑DM21。第二鏈輪SP3之至少一個內部花鍵齒64具有具有內部花鍵底徑DM21之內部花鍵齒根圓RC22。內部花鍵底徑DM21等於或小於34 mm。第二鏈輪SP3之內部花鍵底徑DM21等於或小於33 mm。第二鏈輪SP3之內部花鍵底徑DM21等於或大於29 mm。在此實施例中，第二鏈輪SP3之內部花鍵底徑DM21為32.8 mm。然而，第二鏈輪SP3之內部花鍵底徑DM21不限於此實施例及以上範圍。 第二鏈輪SP3之至少十個內部花鍵齒64具有等於或小於32 mm之內部花鍵頂徑DM22。內部花鍵頂徑DM22等於或小於31 mm。內部花鍵頂徑DM22等於或大於28 mm。在此實施例中，內部花鍵頂徑DM22為30.4 mm。然而，內部花鍵頂徑DM22不限於此實施例及以上範圍。 如圖18中所見，額外鏈輪SP12具有最大齒尖直徑TD12。最大齒尖直徑TD12為由複數個鏈輪齒SP12B界定之最大外徑。內部花鍵底徑DM21 (圖36)與最大齒尖直徑TD12之比率範圍介於0.15至0.18。在此實施例中，內部花鍵底徑DM21與最大齒尖直徑TD12之比率為0.15。然而，內部花鍵底徑DM21與最大齒尖直徑TD12之比率不限於此實施例及以上範圍。 如圖35中所見，複數個內部花鍵傳動表面66包括徑向最外邊緣66A及徑向最內邊緣66B。複數個內部花鍵傳動表面66各自包括自徑向最外邊緣66A至徑向最內邊緣66B界定之徑向長度RL21。複數個內部花鍵傳動表面66之徑向長度RL21之總和等於或大於7 mm。徑向長度RL21之總和等於或大於10 mm。徑向長度RL21之總和等於或大於15 mm。在此實施例中，徑向長度RL21之總和等於或小於36 mm。在此實施例中，徑向長度RL21之總和為16.6 mm然而，徑向長度RL21之總和不限於此實施例及以上範圍。 複數個內部花鍵齒64具有額外徑向長度RL22。額外徑向長度RL22分別自內部花鍵齒根圓RC22至複數個內部花鍵齒64之徑向最內端64A界定。額外徑向長度RL22之總和等於或大於12 mm。在此實施例中，額外徑向長度RL22之總和為34.8 mm。然而，額外徑向長度RL22之總和不限於此實施例及以上範圍。 第二鏈輪SP3之至少十個內部花鍵齒64中之至少一者相對於參考線CL2沿圓周對稱。相對於旋轉中心軸線A1在徑向方向上，參考線CL2自旋轉中心軸線A1延伸至至少十個內部花鍵齒64中之該至少一者之徑向最外端64A的圓周中心點CP2。然而，內部花鍵齒64中之至少一者可相對於參考線CL2具有不對稱形狀。內部花鍵齒64中之至少一者包含內部花鍵傳動表面66及內部花鍵非傳動表面68。 內部花鍵傳動表面66具有第一內部花鍵表面角AG21。第一內部花鍵表面角AG21界定於內部花鍵傳動表面66與第一徑向線L21之間。第一徑向線L21自自行車後鏈輪總成14之旋轉中心軸線A1延伸至內部花鍵傳動表面66之徑向最外邊緣66A。第一內部周節角PA21或第二內部周節角PA22界定於相鄰第一徑向線L21 (見例如圖33)之間。 內部花鍵非傳動表面68具有第二內部花鍵表面角AG22。第二內部花鍵表面角AG22界定於內部花鍵非傳動表面68與第二徑向線L22之間。第二徑向線L22自自行車後鏈輪總成14之旋轉中心軸線A1延伸至內部花鍵非傳動表面68之徑向最外邊緣68A。 在此實施例中，第二內部花鍵表面角AG22等於第一內部花鍵表面角AG21。然而，第一內部花鍵表面角AG21可不同於第二內部花鍵表面角AG22。 第一內部花鍵表面角AG21介於0度至6度。第二內部花鍵表面角AG22範圍介於0度至6度。在此實施例中，第一內部花鍵表面角AG21為5度。第二內部花鍵表面角AG22為5度。然而，第一內部花鍵表面角AG21及第二內部花鍵表面角AG22不限於此實施例及以上範圍。 如圖37中所見，內部花鍵齒64與外部花鍵齒40嚙合以將傳動旋轉力F1自第二鏈輪SP3傳遞至鏈輪支撐主體28。內部花鍵傳動表面66可與外部花鍵傳動表面48接觸以將傳動旋轉力F1自第二鏈輪SP3傳遞至鏈輪支撐主體28。在內部花鍵傳動表面66與外部花鍵傳動表面48接觸之狀態中，內部花鍵非傳動表面68與外部花鍵非傳動表面50間隔開。 第一鏈輪SP2之內部花鍵齒63及第二鏈輪SP4之內部花鍵齒65與第二鏈輪SP3之內部花鍵齒64具有大體上相同之結構。因此，出於簡潔起見，此處將不作詳細描述。 如圖2中所見，鏈輪支撐構件37包括經構形以與自行車後輪轂總成12之鏈輪支撐主體28嚙合的至少十個內部花鍵齒76。複數個內部花鍵齒76具有與複數個內部花鍵齒64之結構大體上相同的結構。因此，出於簡潔起見，此處將不作詳細描述。 如圖38中所見，第一鏈輪SP1包括第一扭矩傳遞結構SP1T，第一扭矩傳遞結構SP1T提供至第一向內側SP1H以直接地或間接地將踩踏扭矩傳遞至鏈輪支撐主體28。在此實施例中，第一扭矩傳遞結構SP1T包括複數個第一扭矩傳遞齒SP1T1以將踩踏扭矩間接地傳遞至鏈輪支撐主體28。第一扭矩傳遞結構SP1T包括至少十個第一扭矩傳遞齒SP1T1。較佳地，至少十個第一扭矩傳遞齒SP1T1之總數目等於或大於20。更佳地，至少十個第一扭矩傳遞齒SP1T1之總數目等於或大於28。在此實施例中，至少十個第一扭矩傳遞齒SP1T1之總數目為29。然而，至少十個第一扭矩傳遞齒SP1T1之總數目不限於此實施例及以上範圍。 如圖38及圖39中所見，第一鏈輪SP2包括第一向內側SP2H及第一向外側SP2G。相對於自行車後鏈輪總成14之旋轉中心軸線A1，第一向外側SP2G在軸向方向D2上與第一向內側SP2H相對。第一鏈輪SP2包括提供至第一向內側SP2H以將踩踏扭矩直接地或間接地傳遞至鏈輪支撐主體28之第一扭矩傳遞結構SP2M。在此實施例中，第一鏈輪SP2之內部花鍵齒63亦可被稱作第一扭矩傳遞齒63。第一扭矩傳遞結構SP2M包括複數個第一扭矩傳遞齒63以將踩踏扭矩直接傳遞至鏈輪支撐主體28。第一扭矩傳遞結構SP2M包括至少十個第一扭矩傳遞齒63。較佳地，至少十個第一扭矩傳遞齒63之總數目等於或大於20。更佳地，至少十個第一扭矩傳遞齒63之總數目等於或大於28。在此實施例中，至少十個第一扭矩傳遞齒63之總數目為29。然而，至少十個第一扭矩傳遞齒63之總數目不限於此實施例及以上範圍。第一扭矩傳遞齒63亦可被稱作內部花鍵齒63。 如圖39中所見，第一鏈輪SP2包括用以接收來自第一鏈輪SP1之踩踏扭矩的第二扭矩傳遞結構SP2T。第二扭矩傳遞結構SP2T設置於第一向外側SP2G上。在此實施例中，第二扭矩傳遞結構SP2T包括複數個第二扭矩傳遞齒SP2T1。較佳地，第二扭矩傳遞齒SP2T1之總數目等於或大於20。更佳地，第二扭矩傳遞齒SP2T1之總數目等於或大於28。在此實施例中，第二扭矩傳遞齒SP2T1之總數目為29。然而，第二扭矩傳遞齒SP2T1之總數目不限於此實施例及以上範圍。第一扭矩傳遞結構SP1T與第二扭矩傳遞結構SP2T嚙合。複數個第一扭矩傳遞齒SP1T1與複數個第二扭矩傳遞齒SP2T1嚙合以傳遞傳動旋轉力F1。 如圖23及圖24中所見，鏈輪支撐主體28包括設置於基座支撐件41之軸向端處的輪轂指示器28I。當沿旋轉中心軸線A1檢視時，輪轂指示器28I設置於第二外部周節角PA12之區域中。在此實施例中，輪轂指示器28I包括點。然而，輪轂指示器28I可包括其他形狀，諸如三角形及線。另外，輪轂指示器28I可為藉由諸如黏附劑之接合結構附接至鏈輪支撐主體28之分離構件。輪轂指示器28I之位置不限於此實施例。 如圖7中所見，第一鏈輪SP1包括設置於鏈輪主體SP1A之軸向端處的鏈輪指示器SP1I。在此實施例中，鏈輪指示器SP1I包括點。然而，鏈輪指示器SP1I可包括其他形狀，諸如三角形及線。另外，鏈輪指示器SP1I可為藉由諸如黏附劑之接合結構附接至鏈輪SP1之分離構件。鏈輪指示器SP1I之位置不限於此實施例。鏈輪指示器SP1I可提供至其他鏈輪SP2至SP12中之任一者。鏈輪指示器SP1I亦可提供至鏈輪支撐構件37。 如圖6中所見，自行車後輪轂總成12進一步包含自由輪結構78。鏈輪支撐主體28藉由自由輪結構78以操作方式耦接至輪轂主體36。自由輪結構78經構形以將鏈輪支撐主體28耦接至輪轂主體36，以在踩踏期間在傳動旋轉方向D11 (圖5)上使鏈輪支撐主體28連同輪轂主體36旋轉。自由輪結構78經構形以允許鏈輪支撐主體28在惰轉期間在相反旋轉方向D12 (圖5)上相對於輪轂主體36旋轉。因此，自由輪結構78可解譯成單向聯軸結構78。稍後將詳細描述自由輪結構78。 自行車後輪轂總成12包括第一軸承79A及第二軸承79B。第一軸承79A及第二軸承79B設置於鏈輪支撐主體28與輪轂軸30之間以圍繞旋轉中心軸線A1相對於輪轂軸30可旋轉地支撐鏈輪支撐主體28。 在此實施例中，鏈輪支撐主體28、制動轉子支撐主體34及輪轂主體36中之每一者由諸如鋁、鐵或鈦之金屬材料製成。然而，鏈輪支撐主體28、制動轉子支撐主體34及輪轂主體36中之至少一者可由非金屬材料製成。 如圖40中所見，自由輪結構78包括第一棘輪構件80及第二棘輪構件82。第一棘輪構件80經構形以按扭矩傳遞方式與輪轂主體36及鏈輪支撐主體28中之一者嚙合。第二棘輪構件82經構形以按扭矩傳遞方式與輪轂主體36及鏈輪支撐主體28中之另一者嚙合。在此實施例中，第一棘輪構件80按扭矩傳遞方式與鏈輪支撐主體28嚙合。第二棘輪構件82按扭矩傳遞方式與輪轂主體36嚙合。然而，第一棘輪構件80可經構形以按扭矩傳遞方式與輪轂主體36嚙合。第二棘輪構件82可經構形以按扭矩傳遞方式與鏈輪支撐主體28嚙合。 第一棘輪構件80安裝至鏈輪支撐主體28以圍繞旋轉中心軸線A1相對於輪轂主體36與鏈輪支撐主體28一起旋轉。第二棘輪構件82安裝至輪轂主體36以圍繞旋轉中心軸線A1相對於鏈輪支撐主體28與輪轂主體36一起旋轉。第一棘輪構件80及第二棘輪構件82中之每一者具有環狀形狀。 第一棘輪構件80及第二棘輪構件82中之至少一者可相對於旋轉中心軸線A1在軸向方向D2上相對於輪轂軸30移動。在此實施例中，第一棘輪構件80及第二棘輪構件82中之每一者可在軸向方向D2上相對於輪轂軸30移動。第二棘輪構件82可在軸向方向D2上相對於輪轂主體36移動。第一棘輪構件80可在軸向方向D2上相對於鏈輪支撐主體28移動。 輪轂主體36包括具有環狀形狀之自由輪外殼36H。自由輪外殼36H在軸向方向D2上延伸。第一棘輪構件80及第二棘輪構件82在已裝配狀態下設置於自由輪外殼36H中。 如圖41中所見，第一棘輪構件80包括至少一個第一棘輪齒80A。在此實施例中，至少一個第一棘輪齒80A包括複數個第一棘輪齒80A。複數個第一棘輪齒80A在圓周方向D1上配置以提供鋸齒。 如圖42中所見，第二棘輪構件82包括經構形以按扭矩傳遞方式與至少一個第一棘輪齒80A嚙合的至少一個第二棘輪齒82A。至少一個第二棘輪齒82A與至少一個第一棘輪齒80A嚙合，以將旋轉力F1自鏈輪支撐主體28傳遞至輪轂主體36 (圖40)。在此實施例中，至少一個第二棘輪齒82A包括經構形以按扭矩傳遞方式與複數個第一棘輪齒80A嚙合之複數個第二棘輪齒82A。複數個第二棘輪齒82A在圓周方向D1上配置以提供鋸齒複數個第二棘輪齒82A可與複數個第一棘輪齒80A嚙合。在第二棘輪齒82A與第一棘輪齒80A嚙合之狀態下，第一棘輪構件80與第二棘輪構件82一起旋轉。 如圖41及圖42中所見，鏈輪支撐主體28具有具有第一螺旋花鍵28H之外部周邊表面28P。第一棘輪構件80經構形以按扭矩傳遞方式與鏈輪支撐主體28嚙合，且包括與第一螺旋花鍵28H配合之第二螺旋花鍵80H。第一棘輪構件80在藉由自鏈輪支撐主體28施加之第一推力傳動期間經由與第一螺旋花鍵28H配合之第二螺旋花鍵80H在相對於鏈輪支撐主體28之軸向方向D2上可移動地安裝。在此實施例中，第一螺旋花鍵28H包括複數個螺旋外部花鍵齒46。第二螺旋花鍵80H包括與複數個螺旋外部花鍵齒46配合之複數個螺旋內部花鍵齒80H1。 如圖43中所見，輪轂主體36包括內部周邊表面36S及至少一個第一齒36T。至少一個第一齒36T設置於內部周邊表面36S上。在此實施例中，自由輪外殼36H包括內部周邊表面36S。輪轂主體36包括複數個第一齒36T。複數個第一齒36T設置於內部周邊表面36S上，且相對於旋轉中心軸線A1自內部周邊表面36S朝內徑向延伸。第一齒36T在圓周方向D1上配置以界定第一齒36T中之鄰近兩個齒之間的複數個凹槽36R。 第二棘輪構件82包括輪轂主體嚙合部分82E，輪轂主體嚙合部分82E經由輪轂主體嚙合部分82E按扭矩傳遞方式與輪轂主體36嚙合以將旋轉力F1自第一棘輪構件80傳遞至輪轂主體36。輪轂主體嚙合部分82E及輪轂主體36中之一者包括徑向延伸之至少一個突出物。輪轂主體嚙合部分82E及輪轂主體36中之另一者包括與該至少一個突起部嚙合之至少一個凹槽。在此實施例中，輪轂主體嚙合部分82E包括徑向延伸之至少一個突出物82T作為至少一個突出物。輪轂主體36包括與至少一個突出物82T嚙合之至少一個凹槽36R。在此實施例中，輪轂主體嚙合部分82E包括複數個突出物82T。複數個突出物82T與複數個凹槽36R嚙合。 如圖42中所見，鏈輪支撐主體28之外部周邊表面28P具有經構形以在惰轉期間導引第一棘輪構件80朝向輪轂主體36之導引部分28G。導引部分28G經配置以與第一螺旋花鍵28H界定鈍角AG28 (圖48)。鏈輪支撐主體28包括複數個導引部分28G。導引部分28G經構形以在惰轉或空轉期間導引第一棘輪構件80朝向輪轂主體36。導引部分28G在惰轉期間朝向輪轂主體36導引第一棘輪構件80以在至少一個第一棘輪齒80A (圖41)與至少一個第二棘輪齒82A之間釋放配合嚙合。導引部分28G經構形以使第一棘輪構件80在軸向方向D2上移動遠離第二棘輪構件82。導引部分28G相對於鏈輪支撐主體28至少在圓周方向D1上延伸。導引部分28G至少在圓周方向D1上自複數個螺旋外部花鍵齒46中之一個齒延伸。儘管在此實施例中導引部分28G與螺旋外部花鍵齒46一體地設置為單件式整體構件，但導引部分28G可為與複數個螺旋外部花鍵齒46分離的構件。由於導引部分28G，第一棘輪構件80及第二棘輪構件82在惰轉期間彼此順利脫嚙，在導引部分28G經配置以相對於第一螺旋花鍵28H界定鈍角AG28之狀況下尤其如此。此亦引起在惰轉期間減少噪聲，此係因為至少一個第一棘輪齒80A及至少一個第二棘輪齒82A在惰轉期間順利地彼此分離。 如圖40中所見，自行車後輪轂總成12進一步包含偏置構件84。偏置構件84安置於輪轂主體36與第一棘輪構件80之間，以在軸向方向D2上使第一棘輪構件80朝向第二棘輪構件82偏置。舉例而言，在此實施例中，偏置構件84為壓縮彈簧。 如圖44中所見，偏置構件84在軸向方向D2上在輪轂主體36與第一棘輪構件80之間壓縮。偏置構件84朝向第二棘輪構件82偏置第一棘輪構件80以維持第一棘輪構件80與第二棘輪構件82經由第一棘輪齒80A及第二棘輪齒82A彼此嚙合之嚙合狀態。 較佳地，偏置構件84與輪轂主體36嚙合以與輪轂主體36旋轉。偏置構件84安裝至輪轂主體36以圍繞旋轉中心軸線A1 (圖40)與輪轂主體36一起旋轉。偏置構件84包括捲曲主體84A及連接端84B。輪轂主體36包括連接孔36F。連接端84B設置於連接孔36F中，以使得偏置構件84圍繞旋轉中心軸線A1 (圖40)與輪轂主體36一起旋轉。 如圖44中所見，鏈輪支撐主體28之外周邊表面28P支撐第一棘輪構件80及第二棘輪構件82。第一棘輪構件80包括面向軸向方向D2之軸向表面80S。至少一個第一棘輪齒80A安置於第一棘輪構件80之軸向表面80S上。在此實施例中，複數個第一棘輪齒80A安置於第一棘輪構件80之軸向表面80S上。軸向表面80S大體上垂直於軸向方向D2。然而，軸向表面80S可不垂直於軸向方向D2。 第二棘輪構件82包括面向軸向方向D2之軸向表面82S。至少一個第二棘輪齒82A安置於第二棘輪構件82之軸向表面82S上。第二棘輪構件82之軸向表面82S面朝第一棘輪構件80之軸向表面80S。在此實施例中，複數個第二棘輪齒82A安置於第二棘輪構件82之軸向表面82S上。軸向表面82S大體上垂直於軸向方向D2。然而軸向表面82S可不垂直於軸向方向D2。 如圖40中所見，自行車後輪轂總成12包含間隔件86、支撐構件88、滑動構件90、額外偏置構件92及收納構件94。然而，有可能自自行車後輪轂總成12省略間隔件86、支撐構件88、滑動構件90、額外偏置構件92及收納構件94中之至少一者。 如圖44及圖45中所見，間隔件86在圍繞旋轉中心軸線A1界定之圓周方向D1上至少部分地設置於至少一個第一齒36T與至少一個突出物82T之間。在此實施例中，間隔件86在圓周方向D1上部分地設置於第一齒36T與突出物82T之間。然而，間隔件86可在圓周方向D1上完全設置於第一齒36T與突出物82T之間。 如圖45至圖47中所見，間隔件86包括設置於至少一個第一齒36T與至少一個突出物82T之間的至少一個中間部分86A。至少一個中間部分86A在圓周方向D1上設置於至少一個第一齒36T與至少一個突出物82T之間。在此實施例中，間隔件86包括分別在圓周方向D1上設置於第一齒36T與突出物82T之間的複數個中間部分86A。儘管間隔件86在此實施例中包括該等中間部分86A，但間隔件86可包括一個中間部分86A。 如圖46及圖47中所見，間隔件86包括連接部分86B。複數個中間部分86A在平行於旋轉中心軸線A1之軸向方向D2上自連接部分86B延伸。儘管間隔件86在此實施例中包括連接部分86B，但連接部分86B可為自間隔件86省略。 間隔件86包括非金屬材料。在此實施例中，非金屬材料包括樹脂材料。樹脂材料之實例包括合成樹脂。作為樹脂材料之替代或補充，非金屬材料可包括除樹脂材料以外之材料。儘管中間部分86A與連接部分86B在此實施例中彼此一體地設置為單件式整體構件，但中間部分86A中之至少一者可為與連接部分86B分離之部分。 如圖44及圖45中所見，複數個中間部分86A在徑向方向上設置於輪轂主體36之內部周邊表面36S與第二棘輪構件82之外部周邊表面82P之間。 如圖44中所見，支撐構件88在軸向方向D2上設置於輪轂主體36與第二棘輪構件82之間。支撐構件88附接至第二棘輪構件82。支撐構件88自第一棘輪構件80徑向向外設置。支撐構件88可與第一棘輪構件80接觸。支撐構件88較佳地包括非金屬材料。由非金屬材料製成之支撐構件88在自行車後輪轂總成12之操作期間減少噪聲。在此實施例中，非金屬材料包括樹脂材料。作為樹脂材料之替代或補充，非金屬材料可包括除樹脂材料以外之材料。 滑動構件90在平行於旋轉中心軸線A1之軸向方向D2上設置於鏈輪支撐主體28與第二棘輪構件82之間。第二棘輪構件82在軸向方向D2上設置於第一棘輪構件80與滑動構件90之間。滑動構件90較佳包括非金屬材料。由非金屬材料製成之滑動構件90在自行車後輪轂總成12之操作期間減少噪聲。在此實施例中，非金屬材料包括樹脂材料。作為樹脂材料之替代或補充，非金屬材料可包括除樹脂材料以外之材料。 鏈輪支撐主體28包括鄰接件28E以鄰接第二棘輪構件82來限制第二棘輪構件82遠離輪轂主體36之軸向移動。鄰接件28E可在此實施例中經由滑動構件90間接地鄰接第二棘輪構件82。替代地，鄰接件28E可直接鄰接第二棘輪構件82。第一棘輪構件80在軸向方向D2上安置於第二棘輪構件82之與鏈輪支撐主體28之鄰接件28E相對的軸向側上。滑動構件90在軸向方向D2上設置於鏈輪支撐主體28之鄰接件28E與第二棘輪構件82之間。 如圖44中所見，額外偏置構件92在軸向方向D2上設置於輪轂主體36與第二棘輪構件82之間，以使第二棘輪構件82朝向鏈輪支撐主體28偏置。在此實施例中，額外偏置構件92經由支撐構件88在軸向方向D2上使第二棘輪構件82偏置。額外偏置構件92自偏置構件84徑向向外設置。額外偏置構件92在此實施例中自複數個第二棘輪齒82A徑向向外設置。 收納構件94包括非金屬材料。由非金屬材料製成之收納構件94在自行車後輪轂總成12之操作期間防止偏置構件84過度扭轉。在此實施例中，非金屬材料包括樹脂材料。作為樹脂材料之替代或補充，非金屬材料可包括除樹脂材料以外之材料。收納構件94包括軸向收納部分96及徑向收納部分98。軸向收納部分96在軸向方向D2上設置於第一棘輪構件80與偏置構件84之間。徑向收納部分98在軸向方向D2上自軸向收納部分96延伸。徑向收納部分98自偏置構件84朝內徑向設置。軸向收納部分96與徑向收納部分98彼此一體地設置為單件式整體構件。然而，軸向收納部分96可為與徑向收納部分98分離之構件。 如圖44中所見，自行車後輪轂總成12包含密封結構100。密封結構100設置於鏈輪支撐主體28與輪轂主體36之間。輪轂主體36包括內部空間102。鏈輪支撐主體28、偏置構件84、第一棘輪構件80及第二棘輪構件82中之每一者至少部分地安置於輪轂主體36之內部空間102中。內部空間102由密封結構100密封。在此實施例中，無潤滑劑設置於內部空間102中。然而，自行車後輪轂總成12可包含設置於內部空間102中之潤滑劑。相比與自行車後輪轂總成12可包含設置於內部空間102中之潤滑劑的狀況，若未設置潤滑劑，則可減少安置於內部空間102中之構件之間的每一間隙。 將在下文參考圖44、圖48及圖49詳細描述自行車後輪轂總成12之操作。 如圖44中所見，軸向方向D2包括第一軸向方向D21及與第一軸向方向D21相反之第二軸向方向D22。偏置力F5在第一軸向方向D21上自偏置構件84施加至收納構件94。偏置構件84之偏置力F5使收納構件94、第一棘輪構件80、第二棘輪構件82及滑動構件90在第一軸向方向D21上朝向鏈輪支撐主體28偏置。此使第一棘輪齒80A與第二棘輪齒82A嚙合。 此外，如圖48中所見，當踩踏扭矩T1在傳動旋轉方向D11上輸入至鏈輪支撐主體28時，螺旋內部花鍵齒80H1在第一軸向方向D21上由螺旋外部花鍵齒46相對於鏈輪支撐主體28導引。此強有力地使第一棘輪齒80A與第二棘輪齒82A嚙合。在此狀態下，踩踏扭矩T1經由第一棘輪構件80及第二棘輪構件82 (圖44)自鏈輪支撐主體28傳遞至輪轂主體36 (圖44)。 如圖48中所見，在惰轉期間，藉由偏置構件84 (圖44)與第一棘輪構件80之間產生之旋轉摩擦力F6，第一棘輪構件80與導引部分28G接觸以自第二棘輪構件82脫嚙。如圖49中所見，惰轉扭矩T2在惰轉期間在傳動旋轉方向D11上施加至輪轂主體36。惰轉扭矩T2經由第二棘輪構件82 (圖44)自輪轂主體36 (圖44)傳遞至第一棘輪構件80。此時，由螺旋外部花鍵齒46在第二軸向方向D22上相對於鏈輪支撐主體28導引螺旋內部花鍵齒80H1。此使第一棘輪構件80在第二軸向方向D22上抵抗偏置力F5相對於鏈輪支撐主體28移動。因此，第一棘輪構件80在第二軸向方向D22上移動遠離第二棘輪構件82，從而致使第一棘輪齒80A與第二棘輪齒82A之間的嚙合較弱。此允許第二棘輪構件82在傳動旋轉方向D11上相對於第一棘輪構件80旋轉，從而防止惰轉扭矩T2經由第一棘輪構件80及第二棘輪構件82自輪轂主體36傳遞至鏈輪支撐主體28。此時，第一棘輪齒80A在圓周方向D1上與第二棘輪齒82A一起滑動。 修改 如圖50中所見，在上述實施例及其他修改中，外部花鍵齒40可包括在圓周方向D1上設置於外部花鍵傳動表面48與外部花鍵非傳動表面50之間的凹槽40G。凹槽40G減小自行車後輪轂總成12之重量。 如圖51中所見，在上述實施例及其他修改中，內部花鍵齒64可包括在圓周方向D1上設置於內部花鍵傳動表面66與內部花鍵非傳動表面68之間的凹槽64G。凹槽64G減小自行車後鏈輪總成14之重量。 在本申請案中，至少十個內部花鍵齒可間接地提供至第二鏈輪之第二開口，而在上述實施例中至少十個內部花鍵齒直接提供至第二鏈輪SP3及SP4中之每一者的第二開口。舉例而言，而非將至少十個內部花鍵齒直接提供至第二鏈輪SP3及/或第二鏈輪SP4之第二開口，第二鏈輪SP3及SP4中之至少一者可附接至包括至少十個內部花鍵齒之鏈輪支撐構件。替代地，而非將至少十個內部花鍵齒直接提供至第二鏈輪之第二開口，至少一個第二鏈輪可與包括至少十個內部花鍵齒之至少一個額外鏈輪一體成型為單件式整體構件。因為此第二鏈輪經由鏈輪支撐構件及/或額外鏈輪間接地包括至少十個內部花鍵齒，所以其亦意謂第二鏈輪包括經構形以與自行車後輪轂總成之鏈輪支撐主體嚙合的至少十個內部花鍵齒。 自行車後鏈輪總成14可僅包括一個第一鏈輪或多於兩個第一鏈輪，而自行車後鏈輪總成14在上述實施例中包括兩個第一鏈輪SP1及SP2。 自行車後鏈輪總成14可僅包括一個第二鏈輪或多於兩個第二鏈輪，而自行車後鏈輪總成14在上述實施例中包括兩個第二鏈輪SP3及SP4。 如圖52中所見，在鏈輪支撐主體28中，至少十個外部花鍵齒40之總數目可範圍介於22至24。舉例而言，至少十個外部花鍵齒40之總數目可為23。第一外部周節角PA11可範圍介於13度至17度。舉例而言，第一外部周節角PA11可為15度。第二外部周節角PA12可範圍介於28度至32度。舉例而言，第二外部周節角PA12可為30度。第一外部周節角PA11為第二外部周節角PA12之一半。然而，第一外部周節角PA11可不同於第二外部周節角PA12之一半。至少十個外部花鍵齒40之總數目不限於以上修改及範圍。第一外部周節角PA11不限於以上修改及範圍。第二外部周節角PA12不限於以上修改及範圍。 如圖53中所見，在鏈輪支撐主體28中，複數個外部花鍵傳動表面48之徑向長度RL11的總和可範圍介於11 mm至14 mm。複數個外部花鍵傳動表面48之徑向長度RL11的總和可為12.5 mm。額外徑向長度RL12之總和可範圍介於26 mm至30 mm。舉例而言，額外徑向長度RL12之總和可為28.2 mm。然而，額外徑向長度RL12之總和不限於以上修改及範圍。 如圖54中所見，在第一鏈輪SP1之第一扭矩傳遞結構SP1T中，至少十個第一扭矩傳遞齒SP1T1之總數目可範圍介於22至24。舉例而言，至少十個第一扭矩傳遞齒SP1T1之總數目可為23。然而，至少十個第一扭矩傳遞齒SP1T1之總數目不限於以上修改及範圍。 如圖55中所見，在第一鏈輪SP2之第二扭矩傳遞結構SP2T中，至少十個第二扭矩傳遞齒SP2T1之總數目可範圍介於22至24。舉例而言，至少十個第二扭矩傳遞齒SP2T1之總數目可為23。然而，至少十個第二扭矩傳遞齒SP2T1之總數目不限於以上修改及範圍。 如圖56中所見，在第一鏈輪SP2中，第一鏈輪SP2之至少十個內部花鍵齒63之總數目可範圍介於22至24。舉例而言，第一鏈輪SP2之至少十個內部花鍵齒63之總數目可為23。然而，至少十個內部花鍵齒63之總數目不限於以上修改及範圍。 如圖57中所見，在第二鏈輪SP3中，第二鏈輪SP3之至少十個內部花鍵齒64之總數目可範圍介於22至24。舉例而言，第二鏈輪SP3之至少十個內部花鍵齒64之總數目可為23。然而，至少十個內部花鍵齒64之總數目不限於以上修改及範圍。 如圖58中所見，在第二鏈輪SP4中，第二鏈輪SP4之至少十個內部花鍵齒65的總數目可範圍介於22至24。舉例而言，第二鏈輪SP4之至少十個內部花鍵齒65之總數目可為23。然而，至少十個內部花鍵齒65之總數目不限於以上修改及範圍。 如圖59中所見，在第二鏈輪SP3之至少十個內部花鍵齒64中，第一內部周節角PA21可範圍介於13度至17度。舉例而言，第一內部周節角PA21可為15度。第二內部周節角PA22可範圍介於28度至32度。舉例而言，第二內部周節角PA22可為30度。第一內部周節角PA21可為第二內部周節角PA22之一半。然而，第一內部周節角PA21可不同於第二內部周節角PA22之一半。第一內部周節角PA21不限於以上修改及範圍。第二內部周節角PA22不限於以上修改及範圍。 如圖60中所見，在第二鏈輪SP3之內部花鍵齒64中，複數個內部花鍵傳動表面66之徑向長度RL21之總和可範圍介於11 mm至14 mm。舉例而言，複數個內部花鍵傳動表面66之徑向長度RL21的總和可為12.5 mm。然而，RL21徑向長度之總和不限於以上修改及範圍。額外徑向長度RL22之總和可範圍介於26 mm至29 mm。舉例而言，額外徑向長度RL22之總和為27.6 mm。然而，額外徑向長度RL22之總和不限於此實施例及以上範圍。第一鏈輪SP2之內部花鍵齒63及第二鏈輪SP4之內部花鍵齒65與第二鏈輪SP3之內部花鍵齒64具有相同結構。 如圖61中所見，鏈輪支撐構件37之內部花鍵齒76可與圖57、圖59及圖60中所說明之第二鏈輪SP3之內部花鍵齒64結構相同。鏈輪支撐構件37之至少十個內部花鍵齒76的總數目可範圍介於22至24。舉例而言，鏈輪支撐構件37之至少十個內部花鍵齒76的總數目可為23。然而，至少十個內部花鍵齒76之總數目不限於以上修改及範圍。圖60中所說明之內部花鍵齒64的結構可適用於鏈輪支撐構件37之內部花鍵齒76。 如圖62中所見，自行車後鏈輪總成14可包含額外鏈輪SP13。額外鏈輪SP13藉由複數個耦接構件SP13R耦接至額外鏈輪SP12。額外鏈輪SP13包括鏈輪主體SP13A及至少一個鏈輪齒SP13B。額外鏈輪SP13之鏈輪主體SP13A藉由複數個耦接構件SP13R耦接至額外鏈輪SP12之鏈輪主體SP12A。至少一個鏈輪齒SP13B自鏈輪主體SP13A徑向向外延伸。至少一個鏈輪齒SP13B之總數目大於至少一個鏈輪齒SP12B之總數目。較佳地，至少一個鏈輪齒SP13B之總齒數等於或大於46。更佳地，至少一個鏈輪齒SP13B之總齒數等於或大於50。舉例而言，至少一個鏈輪齒SP13B之總齒數為54。 鏈輪SP1至SP13之鏈輪齒SP1B至SP13B的齒輪廓可具有習知齒輪廓及/或窄寬齒輪廓。特定言之，作為窄-寬齒輪廓，鏈輪SP1至SP13之鏈輪齒SP1B至SP13B亦可包括至少一個第一齒及至少一個第二齒，該等第一齒各自具有第一軸向最大鏈嚙合寬度，該等第二齒各自具有小於第一軸向最大鏈嚙合寬度之第二軸向最大鏈嚙合寬度。沿著軸向方向D2量測第一軸向最大鏈嚙合寬度及第二軸向最大鏈嚙合寬度。第一軸向最大鏈嚙合寬度大於由自行車鏈20之一對內鏈板界定之軸向內鏈空間，且小於由自行車鏈20之一對外鏈板界定之軸向外鏈空間，其中當自行車鏈20與鏈輪SP1至SP13中之一者嚙合時，該對外鏈板在軸向方向D2上面向彼此。第二軸向最大鏈嚙合寬度小於由自行車鏈20之該對內鏈板界定之軸向內鏈空間。因此，至少一個第一齒經構形以與自行車鏈20之一對外鏈板嚙合，其中當自行車鏈20與鏈輪SP1至SP13中之一者嚙合時該對外鏈板在軸向方向D2上面向彼此，且至少一個第二齒經構形以與自行車鏈20之一對內鏈板嚙合，其中該對內鏈板在軸向方向D2上面向彼此。較佳地，至少一個第一齒與至少一個第二齒交替地安置於鏈輪SP1至SP13中之至少一者的外部周邊上。較佳地，鏈輪SP1至SP13之鏈輪齒SP1B至SP13B包括複數個第一齒及複數個第二齒，該等第一齒各自具有上文所提及之第一軸向最大鏈嚙合寬度，該等第二齒各自具有上文所提及之第二軸向最大鏈嚙合寬度。較佳地，複數個第一齒與複數個第二齒交替地安置於鏈輪SP1至SP13中之至少一者的外部周邊上。較佳地，最大鏈輪之鏈輪齒可具有此窄寬齒輪廓。因此，較佳地，圖6中之鏈輪SP12的鏈輪齒SP12B或圖62中之鏈輪SP13的鏈輪齒SP13B包括具有上文所提及之第一軸向最大鏈嚙合寬度之至少一個第一齒及具有上文所提及之第二軸向最大鏈嚙合寬度之至少一個第二齒。 如本文所使用之術語「包含」及其派生詞意欲為指定陳述特徵、元件、組件、群組、整數及/或步驟的存在但不排除其他未陳述特徵、元件、組件、群組、整數及/或步驟的存在的開放術語。此概念亦適用於類似含義之詞語，例如術語「具有」、「包括」及其派生詞。 術語「構件」、「區段」、「部分」、「部件」、「元件」、「主體」及「結構」在以單數形式使用時可具有單一部件或複數個部件之雙重含義。 諸如本申請案中敍述的「第一」及「第二」之序數數目僅為標識符，而不具有任何其他含義，例如特定次序等等。此外，舉例而言，術語「第一元件」自身不暗示「第二元件」之存在，且術語「第二元件」自身不暗示「第一元件」之存在。 如本文中所使用之術語「對」可涵蓋除其中成對元件具有彼此相同之形狀或結構之構形外之其中成對元件具有彼此不同的形狀或結構之構形。 因此，術語「一」、「一或多個」與「至少一個」在本文中可互換地使用。 最後，如本文中所使用之諸如「大體上」、「大約」及「大致」之程度術語意謂所修飾之術語之合理量之偏差以使得最終結果並無顯著改變。本申請案中所描述之所有數值可被理解為包括諸如「大體上」、「大約」及「大致」之術語。 顯然，根據以上教示，本發明之眾多修改及變化為可能的。因此應理解，在所附申請專利範圍之範疇內，可以不同於如本文特定描述之方式的其他方式實踐本發明。Cross Reference to Related Applications This application is a continuation of a portion of US Patent Application No. 15 / 712,407, filed on September 22, 2017. The contents of this application are incorporated herein by reference in their entirety. Embodiments will now be described with reference to the drawings, in which like reference numerals designate corresponding or identical elements in the various drawings. Referring first to FIG. 1, a bicycle transmission system 10 according to an embodiment includes a bicycle rear hub assembly 12 and a bicycle rear sprocket assembly 14. The bicycle rear hub assembly 12 is fastened to the bicycle frame BF. The bicycle rear sprocket assembly 14 is mounted on the bicycle rear hub assembly 12. The bicycle brake rotor 16 is mounted on the bicycle rear hub assembly 12. The bicycle transmission system 10 further includes a crank assembly 18 and a bicycle chain 20. The crank assembly 18 includes a crank shaft 22, a right crank arm 24, a left crank arm 26, and a front sprocket 27. The right crank arm 24 and the left crank arm 26 are fastened to the crank shaft 22. The front sprocket 27 is fastened to at least one of the crank shaft 22 and the right crank arm 24. The bicycle chain 20 meshes with the front sprocket 27 and the bicycle rear sprocket assembly 14 to transmit the pedaling force from the front sprocket 27 to the bicycle rear sprocket assembly 14. The crank assembly 18 includes a front sprocket 27 as a single sprocket in the illustrated embodiment. However, the crank assembly 18 may include a plurality of front sprockets. The bicycle rear sprocket assembly 14 is a rear sprocket assembly. However, the structure of the bicycle rear sprocket assembly 14 can be applied to the front sprocket. In this application, the following directional terms "front", "back", "forward", "backward", "left", "right", "horizontal", "upward" and "downward" and any other Similar directional terms refer to the directions determined based on a user (eg, a rider) sitting on a bicycle seat (not shown) and facing a handle (not shown). Therefore, these terms, when used to describe a bicycle drive system 10, a bicycle rear hub assembly 12 or a bicycle rear sprocket assembly 14, should be related to a bicycle drive system equipped as used in an upright riding position on a horizontal surface. 10. Bicycles with bicycle rear hub assembly 12 or bicycle rear sprocket assembly 14 are interpreted. As seen in FIG. 2, the bicycle rear hub assembly 12 and the bicycle rear sprocket assembly 14 have a rotation center axis A1. The bicycle rear sprocket assembly 14 is rotatably supported by the bicycle rear hub assembly 12 relative to the bicycle frame BF (FIG. 1) about a rotation center axis A1. The bicycle rear sprocket assembly 14 is configured to mesh with the bicycle chain 20 to transmit a transmission rotational force F1 between the bicycle chain 20 and the bicycle rear sprocket assembly 14 during pedaling. During pedaling, the bicycle rear sprocket assembly 14 rotates around the rotation center axis A1 in the transmission rotation direction D11. The transmission rotation direction D11 is defined along the circumferential direction D1 of the bicycle rear hub assembly 12 or the bicycle rear sprocket assembly 14. The reverse rotation direction D12 is the opposite direction of the transmission rotation direction D11, and is defined along the circumferential direction D1. As seen in FIG. 2, the bicycle rear hub assembly 12 includes a sprocket support body 28. The bicycle rear sprocket assembly 14 is configured to be mounted to a sprocket support body 28 of the bicycle rear hub assembly 12. The bicycle rear sprocket assembly 14 is mounted on the sprocket support body 28 to transmit a transmission rotational force F1 between the sprocket support body 28 and the bicycle rear sprocket assembly 14. The bicycle rear hub assembly 12 includes a hub shaft 30. The sprocket support body 28 is rotatably attached to the upper hub shaft 30 about a rotation center axis A1. The bicycle rear sprocket assembly 14 further includes a locking member 32. The lock member 32 is fastened to the sprocket support body 28 to hold the bicycle rear sprocket assembly 14 with respect to the sprocket support body 28 in the axial direction D2 with respect to the rotation center axis A1. As seen in FIG. 3, the bicycle rear hub assembly 12 is fastened to the bicycle frame BF by a wheel fastening structure WS. The hub shaft 30 includes a shaft through hole 30A. The fastening rod WS1 of the wheel fastening structure WS extends through the shaft through hole 30A of the hub shaft 30. The hub shaft 30 includes a first shaft end 30B and a second shaft end 30C. The hub shaft 30 extends between the first shaft end 30B and the second shaft end 30C along the rotation center axis A1. The first shaft end 30B is disposed in the first groove BF11 of the first frame BF1 of the bicycle frame BF. The second shaft end 30C is disposed in the second groove BF21 of the second frame BF2 of the bicycle frame BF. The hub shaft 30 is held between the first frame BF1 and the second frame BF2 by a wheel fastening structure WS. The wheel fastening structure WS includes a structure known in the applied bicycle. Therefore, for brevity, it will not be described in detail here. In this embodiment, the shaft through hole 30A has a minimum inner diameter BD1 equal to or greater than 13 mm. The minimum inner diameter BD1 of the shaft through hole 30A is preferably equal to or greater than 14 mm. The minimum inner diameter BD1 of the shaft through hole 30A is preferably equal to or less than 21 mm. In this embodiment, the minimum inner diameter BD1 of the shaft through hole 30A is 15 mm. However, the minimum inner diameter BD1 is not limited to this embodiment and above. The hub shaft 30 has a maximum outer diameter BD2 equal to or greater than 17 mm. The maximum outer diameter BD2 of the hub shaft 30 is preferably equal to or greater than 20 mm. The maximum outer diameter BD2 of the hub shaft 30 is preferably equal to or less than 23 mm. In this embodiment, the maximum outer diameter BD2 of the hub shaft 30 is 21 mm. However, the maximum outer diameter BD2 of the hub shaft 30 is not limited to this embodiment and the above range. The hub shaft 30 has a minimum outer diameter BD3 equal to or greater than 15 mm. The minimum outer diameter BD3 is preferably equal to or greater than 17 mm. The minimum outer diameter BD3 is preferably equal to or less than 19 mm. In this embodiment, the minimum outer diameter BD3 of the hub shaft 30 is 17. 6 mm. However, the minimum outer diameter BD3 is not limited to this embodiment and the above range. The hub shaft 30 includes a shaft tube 30X, a first shaft portion 30Y, and a second shaft portion 30Z. The shaft tube 30X has a tubular shape and extends along the rotation center axis A1. The first shaft portion 30Y is fastened to the first end of the shaft tube 30X. The second shaft portion 30Z is fastened to the second end of the shaft tube 30X. At least one of the first shaft portion 30Y and the second shaft portion 30Z may be provided integrally with the shaft tube 30X. As seen in FIGS. 3 and 4, the bicycle rear hub assembly 12 further includes a brake rotor support body 34. The brake rotor support body 34 is rotatably mounted on the hub shaft 30 about a rotation center axis A1. The brake rotor support body 34 is coupled to the bicycle brake rotor 16 (FIG. 1) to transmit a braking rotational force from the bicycle brake rotor 16 to the brake rotor support body 34. As seen in FIG. 4, the bicycle rear hub assembly 12 includes a hub body 36. The hub body 36 is rotatably mounted on the hub shaft 30 around a rotation center axis A1 of the bicycle rear hub assembly 12. In this embodiment, the sprocket support body 28 is a separate member from the hub body 36. The brake rotor support body 34 is integrally provided with the hub body 36 as a one-piece integral member. However, the sprocket support body 28 may be provided integrally with the hub body 36. The brake rotor supporting body 34 may be a separate member from the hub body 36. For example, the hub body 36 is made of a metal material including aluminum. As seen in FIG. 5, the bicycle rear sprocket assembly 14 includes a plurality of bicycle sprocket wheels. The plurality of bicycle sprocket wheels include a first sprocket wheel and a second sprocket wheel. In this embodiment, the plurality of bicycle sprocket wheels include a plurality of first sprocket wheels SP1 and SP2 provided as first sprocket wheels. The plurality of bicycle sprocket wheels also include a plurality of second sprocket wheels SP3 and SP4 provided as a second sprocket wheel. The plurality of bicycle sprocket wheels include additional sprocket wheels. In this embodiment, the plurality of bicycle sprocket wheels include a plurality of additional sprocket wheels SP5 to SP12. However, the total number of first sprocket wheels is not limited to this embodiment. The total number of second sprockets is not limited to this embodiment. The total number of additional sprockets is not limited to this embodiment. In addition, the first sprocket SP1 and SP2 may be integrally formed as a one-piece integral member, and the first sprocket SP1 is a sprocket separated from the first sprocket SP2 in this embodiment. Similarly, the second sprocket SP3 and SP4 can be integrally formed as a one-piece integral component, and the second sprocket SP3 is a sprocket separated from the second sprocket SP4 in this embodiment. For example, the total number of the plurality of bicycle sprocket wheels is equal to or greater than ten. The total number of the plurality of bicycle sprocket wheels may be equal to or greater than eleven. The total number of the plurality of bicycle sprocket wheels may be equal to or greater than twelve. In this embodiment, the total number of the plurality of bicycle sprocket wheels is twelve. However, the total number of the plurality of bicycle sprocket wheels is not limited to this embodiment. For example, the total number of the bicycle sprocket wheels may be 13, 14, or 15 or more. In this embodiment, the first sprocket SP1 is the smallest sprocket in the bicycle rear sprocket assembly 14. The extra sprocket SP12 is the largest sprocket in the bicycle rear sprocket assembly 14. The first sprocket SP2 corresponds to a high-speed gear in the bicycle rear sprocket assembly 14. The extra sprocket SP12 corresponds to the low speed gear in the bicycle rear sprocket assembly 14. As seen in Fig. 5, the first sprocket SP1 has a pitch circle diameter PCD1. The first sprocket SP2 has a pitch circle diameter PCD2. The second sprocket SP3 has a pitch circle diameter PCD3. The second sprocket SP4 has a pitch circle diameter PCD4. The additional sprocket SP5 has a pitch circle diameter PCD5. The additional sprocket SP6 has a pitch circle diameter PCD6. The additional sprocket SP7 has a pitch circle diameter PCD7. The additional sprockets SP8 have a pitch circle diameter PCD8. The additional sprockets SP9 have a pitch circle diameter PCD9. The additional sprockets SP10 have a pitch circle diameter PCD10. The additional sprocket SP11 has a pitch circle diameter PCD11. The additional sprockets SP12 have a pitch circle diameter PCD12. The first sprocket SP1 has a pitch circle PC1 having a pitch circle diameter PCD1. The first sprocket SP2 has a pitch circle PC2 having a pitch circle diameter PCD2. The second sprocket SP3 has a pitch circle PC3 having a pitch circle diameter PCD3. The second sprocket SP4 has a pitch circle PC4 having a pitch circle diameter PCD4. The additional sprocket SP5 has a pitch circle PC5 having a pitch circle diameter PCD5. The additional sprocket SP6 has a pitch circle PC6 having a pitch circle diameter PCD6. The additional sprocket SP7 has a pitch circle PC7 having a pitch circle diameter PCD7. The additional sprocket SP8 has a pitch circle PC8 having a pitch circle diameter PCD8. The additional sprocket SP9 has a pitch circle PC9 having a pitch circle diameter PCD9. The additional sprocket SP10 has a pitch circle PC10 having a pitch circle diameter PCD10. The additional sprocket SP11 has a pitch circle PC11 having a pitch circle diameter PCD11. The additional sprocket SP12 has a pitch circle PC12 having a pitch circle diameter PCD12. The pitch circle PC1 of the first sprocket SP1 is defined by the center axis of the pin of the bicycle chain 20 (FIG. 2) that meshes with the first sprocket SP1. Define pitch circles PC2 to PC12 and pitch circles PC1. Therefore, for brevity, it will not be described in detail here. In this embodiment, the pitch circle diameter PCD1 is smaller than the pitch circle diameter PCD2. The pitch circle diameter PCD2 is smaller than the pitch circle diameter PCD3. The pitch circle diameter PCD3 is smaller than the pitch circle diameter PCD4. The pitch circle diameter PCD4 is smaller than the pitch circle diameter PCD5. The pitch circle diameter PCD5 is smaller than the pitch circle diameter PCD6. The pitch circle diameter PCD6 is smaller than the pitch circle diameter PCD7. The pitch circle diameter PCD7 is smaller than the pitch circle diameter PCD8. The pitch circle diameter PCD8 is smaller than the pitch circle diameter PCD9. The pitch circle diameter PCD9 is smaller than the pitch circle diameter PCD10. The pitch circle diameter PCD10 is smaller than the pitch circle diameter PCD11. The pitch circle diameter PCD11 is smaller than the pitch circle diameter PCD12. The pitch circle diameter PCD1 is the smallest pitch circle diameter in the bicycle rear sprocket assembly 14. The pitch circle diameter PCD12 is the largest pitch circle diameter in the bicycle rear sprocket assembly 14. The first sprocket SP1 corresponds to a high-speed gear in the bicycle rear sprocket assembly 14. The extra sprocket SP12 corresponds to the low speed gear in the bicycle rear sprocket assembly 14. However, the first sprocket SP1 may correspond to another gear in the bicycle rear sprocket assembly 14. The additional sprocket SP12 may correspond to another gear in the bicycle rear sprocket assembly 14. As seen in FIG. 6, the first sprocket SP2 is adjacent to the first sprocket SP1 in the axial direction D2 with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14, and between the first sprocket SP1 and SP2 No other sprocket. The second sprocket SP3 is adjacent to the first sprocket SP2 in the axial direction D2 with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14, and there is no other between the first sprocket SP2 and the second sprocket SP3. A sprocket. The second sprocket SP4 is adjacent to the second sprocket SP3 in the axial direction D2 with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14, and there is no other difference between the second sprocket SP3 and the second sprocket SP4. A sprocket. The first sprocket SP1 and SP2, the second sprocket SP3, the second sprocket SP4, and the additional sprocket SP5 to SP12 are arranged in the axial direction D2 in this order. As seen in FIG. 7, the first sprocket SP1 includes a sprocket body SP1A and a plurality of sprocket teeth SP1B. The plurality of sprocket teeth SP1B extend radially outward from the sprocket body SP1A with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14. The total number of teeth of the first sprocket SP1 (the total number of at least one sprocket tooth SP1B) is equal to or less than ten. In this embodiment, the total number of at least one sprocket tooth SP1B of the first sprocket SP1 is ten. However, the total number of the plurality of sprocket teeth SP1B of the first sprocket SP1 is not limited to this embodiment and the above range. As seen in FIG. 8, the first sprocket SP2 includes a sprocket body SP2A and a plurality of sprocket teeth SP2B. The plurality of sprocket teeth SP2B extend radially outward from the sprocket body SP2A with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14. In this embodiment, the total number of at least one sprocket tooth SP2B is twelve. However, the total number of the plurality of sprocket teeth SP2B of the first sprocket SP2 is not limited to this embodiment. The first sprocket SP2 includes at least one first shift promotion area SP2F1 to facilitate a first shift operation of shifting the bicycle chain 20 from the first sprocket SP2 to the first sprocket SP1. The first sprocket SP2 includes at least one second shift promotion region SP2F2 to facilitate a second shift operation of the bicycle chain 20 from the first sprocket SP1 to the first sprocket SP2. In this embodiment, the first sprocket SP2 includes a plurality of first shift promotion regions SP2F1 to facilitate the first shift operation. The first sprocket SP2 includes a plurality of second shift promotion regions SP2F2 to facilitate the second shift operation. However, the total number of the first shift promotion areas SP2F1 is not limited to this embodiment. The total number of the second shift promotion areas SP2F2 is not limited to this embodiment. The term "shift promotion area" as used herein is intended to be an area that is intentionally designed to facilitate the shifting operation of a bicycle chain from a sprocket to another axially adjacent sprocket in that area. In this embodiment, the first sprocket SP2 includes a plurality of first shift promotion grooves SP2R1 to facilitate the first shift operation. The first sprocket SP2 includes a plurality of second shift promotion grooves SP2R2 to facilitate the second shift operation. The first shift promotion groove SP2R1 is provided in the first shift promotion region SP2F1. However, the first shift promotion region SP2F1 may include another structure to replace or supplement the first shift promotion groove SP2R1. The second displacement promotion region SP2F2 may include another structure to replace or supplement the second displacement promotion groove SP2R2. As seen in FIG. 9, the second sprocket SP3 includes a sprocket body SP3A and a plurality of sprocket teeth SP3B. The plurality of sprocket teeth SP3B extend radially outward from the sprocket body SP3A with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14. In this embodiment, the total number of at least one sprocket tooth SP3B is fourteen. However, the total number of the plurality of sprocket teeth SP3B of the second sprocket SP3 is not limited to this embodiment. The second sprocket SP3 includes at least one first shift promotion area SP3F1 to facilitate the first shift operation of the bicycle chain 20 from the second sprocket SP3 to the first sprocket SP2 (FIG. 6). The second sprocket SP3 includes at least one second shift promotion region SP3F2 to facilitate the second shift operation of shifting the bicycle chain 20 from the first sprocket SP2 (FIG. 6) to the second sprocket SP3. In this embodiment, the second sprocket SP3 includes a plurality of first shift promotion regions SP3F1 to facilitate the first shift operation. The second sprocket SP3 includes a plurality of second shift promotion regions SP3F2 to facilitate the second shift operation. However, the total number of the first shift promotion areas SP3F1 is not limited to this embodiment. The total number of the second shift promotion areas SP3F2 is not limited to this embodiment. In this embodiment, the second sprocket SP3 includes a plurality of first shift promotion grooves SP3R1 to facilitate the first shift operation. The second sprocket SP3 includes a plurality of second shift promotion grooves SP3R2 to facilitate the second shift operation. The first shift promotion groove SP3R1 is provided in the first shift promotion region SP3F1. However, the first shift promotion region SP3F1 may include another structure to replace or supplement the first shift promotion groove SP3R1. The second displacement promotion region SP3F2 may include another structure to replace or supplement the second displacement promotion groove SP3R2. As seen in FIG. 10, the second sprocket SP4 includes a sprocket body SP4A and a plurality of sprocket teeth SP4B. The plurality of sprocket teeth SP4B extend radially outward from the sprocket body SP4A with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14. In this embodiment, the total number of at least one sprocket tooth SP4B is sixteen. However, the total number of the plurality of sprocket teeth SP4B of the second sprocket SP4 is not limited to this embodiment. The second sprocket SP4 includes at least one first shift promotion area SP4F1 to facilitate the first shift operation of the bicycle chain 20 from the second sprocket SP4 to the second sprocket SP3. The second sprocket SP4 includes at least one second shift promotion region SP4F2 to facilitate a second shift operation of the bicycle chain 20 from the second sprocket SP3 to the second sprocket SP4. In this embodiment, the second sprocket SP4 includes a plurality of first shift promotion regions SP4F1 to facilitate the first shift operation. The second sprocket SP4 includes a plurality of second shift promotion regions SP4F2 to facilitate the second shift operation. However, the total number of the first shift promotion regions SP4F1 is not limited to this embodiment. The total number of the second shift promotion areas SP4F2 is not limited to this embodiment. In this embodiment, the second sprocket SP4 includes a plurality of first shift promotion grooves SP4R1 to facilitate the first shift operation. The second sprocket SP4 includes a plurality of second shift promotion grooves SP4R2 to facilitate the second shift operation. The first shift promotion groove SP4R1 is provided in the first shift promotion region SP4F1. However, the first shift promotion region SP4F1 may include another structure to replace or supplement the first shift promotion groove SP4R1. The second shift promotion region SP4F2 may include another structure to replace or supplement the second shift promotion groove SP4R2. As seen in FIG. 11, the additional sprocket SP5 includes a sprocket body SP5A and a plurality of sprocket teeth SP5B. The plurality of sprocket teeth SP5B extend radially outward from the sprocket body SP5A with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14. In this embodiment, the total number of at least one sprocket tooth SP5B is 18. However, the total number of the plurality of sprocket teeth SP5B of the additional sprocket SP5 is not limited to this embodiment. The additional sprocket SP5 includes at least one first shift promotion area SP5F1 to facilitate the first shifting operation of the bicycle chain 20 from the extra sprocket SP5 to an adjacent smaller sprocket SP4. The additional sprocket SP5 includes at least one second shift promotion area SP5F2 to facilitate the second shift operation of shifting the bicycle chain 20 from the adjacent smaller sprocket SP4 to the additional sprocket SP5. The adjacent smaller sprocket SP4 is adjacent to the additional sprocket SP5 in the axial direction D2 with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14, and between the additional sprocket SP5 and the adjacent smaller sprocket SP4 No other sprocket. In this embodiment, the additional sprocket SP5 includes a plurality of first shift promotion regions SP5F1 to facilitate the first shift operation. The additional sprocket SP5 includes a plurality of second shift promotion regions SP5F2 to facilitate the second shift operation. However, the total number of the first shift promotion areas SP5F1 is not limited to this embodiment. The total number of the second shift promotion areas SP5F2 is not limited to this embodiment. In this embodiment, the additional sprocket SP5 includes a plurality of first shift promotion grooves SP5R1 to facilitate the first shift operation. The additional sprocket SP5 includes a plurality of second shift promotion grooves SP5R2 to facilitate the second shift operation. The first shift promotion groove SP5R1 is provided in the first shift promotion region SP5F1. The second shift promotion groove SP5R2 is provided in the second shift promotion region SP5F2. However, the first shift promotion region SP5F1 may include another structure to replace or supplement the first shift promotion groove SP5R1. The second displacement promotion region SP5F2 may include another structure to replace or supplement the second displacement promotion groove SP5R2. As seen in FIG. 12, the additional sprocket SP6 includes a sprocket body SP6A and a plurality of sprocket teeth SP6B. The plurality of sprocket teeth SP6B extend radially outward from the sprocket body SP6A with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14. In this embodiment, the total number of at least one sprocket tooth SP6B is twenty-one. However, the total number of the plurality of sprocket teeth SP6B of the additional sprocket SP6 is not limited to this embodiment. The additional sprocket SP6 includes at least one first shift promotion area SP6F1 to facilitate the first shift operation of shifting the bicycle chain 20 from the additional sprocket SP6 to an adjacent smaller sprocket SP5. The additional sprocket SP6 includes at least one second shift promotion area SP6F2 to facilitate the second shift operation of shifting the bicycle chain 20 from the adjacent smaller sprocket SP5 to the additional sprocket SP6. The adjacent smaller sprocket SP5 is adjacent to the additional sprocket SP6 in the axial direction D2 relative to the rotation center axis A1 of the bicycle rear sprocket assembly 14, and between the additional sprocket SP6 and the adjacent smaller sprocket SP5 No other sprocket. In this embodiment, the additional sprocket SP6 includes a plurality of first shift promotion regions SP6F1 to facilitate the first shift operation. The additional sprocket SP6 includes a plurality of second shift promotion regions SP6F2 to facilitate the second shift operation. However, the total number of the first shift promotion areas SP6F1 is not limited to this embodiment. The total number of the second shift promotion areas SP6F2 is not limited to this embodiment. In this embodiment, the additional sprocket SP6 includes a plurality of first shift promotion grooves SP6R1 to facilitate the first shift operation. The additional sprocket SP6 includes a plurality of second shift promotion grooves SP6R2 to facilitate the second shift operation. The first shift promotion groove SP6R1 is provided in the first shift promotion region SP6F1. The second shift promotion groove SP6R2 is provided in the second shift promotion region SP6F2. However, the first displacement promotion region SP6F1 may include another structure to replace or supplement the first displacement promotion groove SP6R1. The second displacement promotion region SP6F2 may include another structure to replace or supplement the second displacement promotion groove SP6R2. As seen in FIG. 13, the additional sprocket SP7 includes a sprocket body SP7A and a plurality of sprocket teeth SP7B. The plurality of sprocket teeth SP7B extend radially outward from the sprocket body SP7A relative to the rotation center axis A1 of the bicycle rear sprocket assembly 14. In this embodiment, the total number of at least one sprocket tooth SP7B is 24. However, the total number of the plurality of sprocket teeth SP7B of the additional sprocket SP7 is not limited to this embodiment. The extra sprocket SP7 includes at least one first shift promotion area SP7F1 to facilitate the first shift operation of the bicycle chain 20 from the extra sprocket SP7 to an adjacent smaller sprocket SP6. The additional sprocket SP7 includes at least one second shift promotion area SP7F2 to facilitate the second shift operation of shifting the bicycle chain 20 from the adjacent smaller sprocket SP6 to the additional sprocket SP7. The adjacent smaller sprocket SP6 is adjacent to the additional sprocket SP7 in the axial direction D2 with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14, and between the additional sprocket SP7 and the adjacent smaller sprocket SP6 No other sprocket. In this embodiment, the additional sprocket SP7 includes a plurality of first shift promotion regions SP7F1 to facilitate the first shift operation. The additional sprocket SP7 includes a plurality of second shift promotion regions SP7F2 to facilitate the second shift operation. However, the total number of the first shift promotion areas SP7F1 is not limited to this embodiment. The total number of the second shift promotion areas SP7F2 is not limited to this embodiment. In this embodiment, the additional sprocket SP7 includes a plurality of first shift promotion grooves SP7R1 to facilitate the first shift operation. The additional sprocket SP7 includes a plurality of second shift promotion grooves SP7R2 to facilitate the second shift operation. The first shift promotion groove SP7R1 is provided in the first shift promotion region SP7F1. The second shift promotion groove SP7R2 is provided in the second shift promotion region SP7F2. However, the first shift promotion region SP7F1 may include another structure to replace or supplement the first shift promotion groove SP7R1. The second shift promotion region SP7F2 may include another structure to replace or supplement the second shift promotion groove SP7R2. As seen in FIG. 14, the additional sprocket SP8 includes a sprocket body SP8A and a plurality of sprocket teeth SP8B. The plurality of sprocket teeth SP8B extend radially outward from the sprocket body SP8A with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14. In this embodiment, the total number of at least one sprocket tooth SP8B is 28. However, the total number of the plurality of sprocket teeth SP8B of the additional sprocket SP8 is not limited to this embodiment. The extra sprocket SP8 includes at least one first shift promotion area SP8F1 to facilitate the first shift operation of the bicycle chain 20 from the extra sprocket SP8 to an adjacent smaller sprocket SP7. The additional sprocket SP8 includes at least one second shift promotion region SP8F2 to facilitate the second shift operation of shifting the bicycle chain 20 from the adjacent smaller sprocket SP7 to the additional sprocket SP8. The adjacent smaller sprocket SP7 is adjacent to the additional sprocket SP8 in the axial direction D2 relative to the rotation center axis A1 of the bicycle rear sprocket assembly 14, and between the additional sprocket SP8 and the adjacent smaller sprocket SP7 No other sprocket. In this embodiment, the additional sprocket SP8 includes a plurality of first shift promotion regions SP8F1 to facilitate the first shift operation. The additional sprocket SP8 includes a plurality of second shift promotion regions SP8F2 to facilitate the second shift operation. However, the total number of the first shift promotion regions SP8F1 is not limited to this embodiment. The total number of the second shift promotion areas SP8F2 is not limited to this embodiment. In this embodiment, the additional sprocket SP8 includes a plurality of first shift promotion grooves SP8R1 to facilitate the first shift operation. The additional sprocket SP8 includes a plurality of second shift promotion grooves SP8R2 to facilitate the second shift operation. The first shift promotion groove SP8R1 is provided in the first shift promotion region SP8F1. The second shift promotion groove SP8R2 is provided in the second shift promotion region SP8F2. However, the first shift promotion region SP8F1 may include another structure to replace or supplement the first shift promotion groove SP8R1. The second displacement promotion region SP8F2 may include another structure to replace or supplement the second displacement promotion groove SP8R2. As seen in FIG. 15, the additional sprocket SP9 includes a sprocket body SP9A and a plurality of sprocket teeth SP9B. The plurality of sprocket teeth SP9B extend radially outward from the sprocket body SP9A with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14. In this embodiment, the total number of at least one sprocket tooth SP9B is 33. However, the total number of the plurality of sprocket teeth SP9B of the additional sprocket SP9 is not limited to this embodiment. The extra sprocket SP9 includes at least one first shift promotion area SP9F1 to facilitate the first shift operation of the bicycle chain 20 from the extra sprocket SP9 to an adjacent smaller sprocket SP8. The additional sprocket SP9 includes at least one second shift promotion area SP9F2 to facilitate the second shift operation of shifting the bicycle chain 20 from the adjacent smaller sprocket SP8 to the additional sprocket SP9. The adjacent smaller sprocket SP8 is adjacent to the additional sprocket SP9 in the axial direction D2 relative to the rotation center axis A1 of the bicycle rear sprocket assembly 14, and between the additional sprocket SP9 and the adjacent smaller sprocket SP8 No other sprocket. In this embodiment, the additional sprocket SP9 includes a plurality of first shift promotion regions SP9F1 to facilitate the first shift operation. The additional sprocket SP9 includes a plurality of second shift promotion regions SP9F2 to facilitate the second shift operation. However, the total number of the first shift promotion regions SP9F1 is not limited to this embodiment. The total number of the second shift promotion regions SP9F2 is not limited to this embodiment. In this embodiment, the additional sprocket SP9 includes a plurality of first shift promotion grooves SP9R1 to facilitate the first shift operation. The additional sprocket SP9 includes a plurality of second shift promotion grooves SP9R2 to facilitate the second shift operation. The first shift promotion groove SP9R1 is provided in the first shift promotion region SP9F1. The second shift promotion groove SP9R2 is provided in the second shift promotion region SP9F2. However, the first shift promotion region SP9F1 may include another structure to replace or supplement the first shift promotion groove SP9R1. The second displacement promotion region SP9F2 may include another structure to replace or supplement the second displacement promotion groove SP9R2. As seen in FIG. 16, the additional sprocket SP10 includes a sprocket body SP10A and a plurality of sprocket teeth SP10B. The plurality of sprocket teeth SP10B extend radially outward from the sprocket body SP10A with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14. In this embodiment, the total number of at least one sprocket tooth SP10B is 39. However, the total number of the plurality of sprocket teeth SP10B of the additional sprocket SP10 is not limited to this embodiment. The extra sprocket SP10 includes at least one first shift promotion area SP10F1 to facilitate the first shift operation of the bicycle chain 20 from the extra sprocket SP10 to an adjacent smaller sprocket SP9. The additional sprocket SP10 includes at least one second shift promotion area SP10F2 to facilitate the second shift operation of shifting the bicycle chain 20 from an adjacent smaller sprocket SP9 to the additional sprocket SP10. The adjacent smaller sprocket SP9 is adjacent to the additional sprocket SP10 in the axial direction D2 relative to the rotation center axis A1 of the bicycle rear sprocket assembly 14, and between the additional sprocket SP10 and the adjacent smaller sprocket SP9 No other sprocket. In this embodiment, the additional sprocket SP10 includes a plurality of first shift promotion regions SP10F1 to facilitate the first shift operation. The additional sprocket SP10 includes a plurality of second shift promotion regions SP10F2 to facilitate the second shift operation. However, the total number of the first shift promotion regions SP10F1 is not limited to this embodiment. The total number of the second shift promotion regions SP10F2 is not limited to this embodiment. In this embodiment, the additional sprocket SP10 includes a plurality of first shift promotion grooves SP10R1 to facilitate the first shift operation. The additional sprocket SP10 includes a plurality of second shift promotion grooves SP10R2 to facilitate the second shift operation. The first shift promotion groove SP10R1 is provided in the first shift promotion region SP10F1. The second shift promotion groove SP10R2 is provided in the second shift promotion region SP10F2. However, the first displacement promotion region SP10F1 may include another structure to replace or supplement the first displacement promotion groove SP10R1. The second displacement promotion region SP10F2 may include another structure to replace or supplement the second displacement promotion groove SP10R2. As seen in FIG. 17, the additional sprocket SP11 includes a sprocket body SP11A and a plurality of sprocket teeth SP11B. The plurality of sprocket teeth SP11B extend radially outward from the sprocket body SP11A with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14. In this embodiment, the total number of at least one sprocket tooth SP11B is 45. However, the total number of the plurality of sprocket teeth SP11B of the additional sprocket SP11 is not limited to this embodiment. The additional sprocket SP11 includes at least one first shift promotion area SP11F1 to facilitate a first shift operation of the bicycle chain 20 from the additional sprocket SP11 to an adjacent smaller sprocket SP10. The additional sprocket SP11 includes at least one second shift promotion area SP11F2 to facilitate the second shift operation of shifting the bicycle chain 20 from the adjacent smaller sprocket SP10 to the additional sprocket SP11. The adjacent smaller sprocket SP10 is adjacent to the additional sprocket SP11 in the axial direction D2 relative to the rotation center axis A1 of the bicycle rear sprocket assembly 14, and between the additional sprocket SP11 and the adjacent smaller sprocket SP10 No other sprocket. In this embodiment, the additional sprocket SP11 includes a plurality of first shift promotion regions SP11F1 to facilitate the first shift operation. The additional sprocket SP11 includes a plurality of second shift promotion groove regions SP11F2 to facilitate the second shift operation. However, the total number of the first shift promotion regions SP11F1 is not limited to this embodiment. The total number of the second shift promotion areas SP11F2 is not limited to this embodiment. In this embodiment, the additional sprocket SP11 includes a plurality of first shift promotion grooves SP11R1 to facilitate the first shift operation. The additional sprocket SP11 includes a plurality of second shift promotion grooves SP11R2 to facilitate the second shift operation. The first shift promotion groove SP11R1 is provided in the first shift promotion region SP11F1. The second shift promotion groove SP11R2 is provided in the second shift promotion region SP11F2. However, the first displacement promotion region SP11F1 may include another structure to replace or supplement the first displacement promotion groove SP11R1. The second displacement promotion region SP11F2 may include another structure to replace or supplement the second displacement promotion groove SP11R2. As seen in FIG. 18, the additional sprocket SP12 includes a sprocket body SP12A and a plurality of sprocket teeth SP12B. The plurality of sprocket teeth SP12B extend radially outward from the sprocket body SP12A relative to the rotation center axis A1 of the bicycle rear sprocket assembly 14. The total number of teeth of the additional sprocket SP12 is equal to or greater than 46. The total number of teeth of the additional sprockets SP12 may also be equal to or greater than 50. The total number of teeth of the additional sprocket SP12 is 51 in this embodiment. However, the total number of at least one sprocket tooth SP12B of the additional sprocket SP12 is not limited to this embodiment and the above range. The additional sprocket SP12 includes at least one first shift promotion area SP12F1 to facilitate the first shift operation of shifting the bicycle chain 20 from the additional sprocket SP12 to an adjacent smaller sprocket SP11. The additional sprocket SP12 includes at least one second shift promotion area SP12F2 to facilitate the second shift operation of shifting the bicycle chain 20 from the adjacent smaller sprocket SP11 to the additional sprocket SP12. The adjacent smaller sprocket SP11 is adjacent to the additional sprocket SP12 in the axial direction D2 with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14, and between the additional sprocket SP12 and the adjacent smaller sprocket SP11 No other sprocket. In this embodiment, the additional sprocket SP12 includes a plurality of first shift promotion regions SP12F1 to facilitate the first shift operation. The additional sprocket SP12 includes a plurality of second shift promotion regions SP12F2 to facilitate the second shift operation. However, the total number of the first shift promotion regions SP12F1 is not limited to this embodiment. The total number of the second shift promotion areas SP12F2 is not limited to this embodiment. In this embodiment, the additional sprocket SP12 includes a plurality of first shift promotion grooves SP12R1 to facilitate the first shift operation. The additional sprocket SP12 includes a plurality of second shift promotion grooves SP12R2 to facilitate the second shift operation. The first shift promotion groove SP12R1 is provided in the first shift promotion region SP12F1. The second shift promotion groove SP12R2 is provided in the second shift promotion region SP12F2. However, the first displacement promotion region SP12F1 may include another structure to replace or supplement the first displacement promotion groove SP12R1. The second displacement promotion region SP12F2 may include another structure to replace or supplement the second displacement promotion groove SP12R2. As seen in FIG. 19, the sprockets SP1 to SP12 are separate members. However, at least one of the sprockets SP1 to SP12 may be provided at least partially integrally with the other of the sprockets SP1 to SP12. All sprockets SP1 to SP12 can be integrated with each other as a one-piece integral unit. In this case, at least one of the sprockets SP3 to SP12 may include at least ten internal spline teeth. The bicycle rear sprocket assembly 14 further includes a sprocket support member 37, a plurality of spacers 38, a first ring 39A, and a second ring 39B. The first ring 39A is provided between the second sprocket SP3 and the second sprocket SP4 in the axial direction D2. The second ring 39B is disposed between the second sprocket SP4 and the additional sprocket SP5 in the axial direction D2. The additional sprocket is configured to attach to the sprocket support member 37. The additional sprockets SP5 to SP12 are configured to attach to the sprocket support member 37 in this embodiment. As seen in FIG. 6, for example, the additional sprocket is attached to the sprocket support member 37 by an adhesive 37A. In this embodiment, the additional sprockets SP5 to SP12 are attached to the sprocket support member 37 by an adhesive 37A. Therefore, it is possible to reduce the weight of the bicycle rear sprocket assembly 14 by reducing or eliminating metal fasteners. However, at least one of the additional sprockets SP5 to SP12 may be attached to the sprocket support member 37 by another structure (including a metal fastener) other than the adhesive 37A. At least one of the additional sprockets SP5 to SP12 can be engaged with the sprocket support body 28 without the sprocket support member 37. The sprocket support member 37 may be omitted from the bicycle rear sprocket assembly 14. In addition, at least one of the second sprocket SP3 and SP4 may be attached to the sprocket support member 37. As seen in FIG. 4, the locking member 32 includes a tubular body 32A, an externally threaded portion 32B, and a radial protrusion 32C. The tubular body 32A includes a first axial end 32D and a second axial end 32E. With respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14, the second axial end 32E is opposed to the first axial end 32D in the axial direction D2. As seen in FIG. 6, in a state where the bicycle rear sprocket assembly 14 is mounted to the bicycle rear hub assembly 12, the first axial end 32D is positioned closer to the bicycle rear hub assembly 12 than the second axial end 32E. The axial center plane CPL. The axial center plane CPL is perpendicular to the rotation center axis A1. As seen in FIG. 3, the axial center plane CPL is defined to bisect the axial length of the bicycle rear hub assembly 12 in the axial direction D2. As seen in FIG. 6, the externally threaded portion 32B is provided to the first axial end 32D to support the sprocket of the bicycle rear hub assembly 12 with the bicycle rear sprocket assembly 14 mounted to the bicycle rear hub assembly 12 The internally threaded portion 28A of the main body 28 is engaged. The radial protrusion 32C extends radially outward from the second axial end 32E relative to the rotation center axis A1 to restrict the first sprocket SP2 in a state where the bicycle rear sprocket assembly 14 is mounted to the bicycle rear hub assembly 12 The axial movement of the sprocket support body 28 relative to the bicycle rear hub assembly 12. The first sprocket SP1 includes a first inward SP1G and a first outward SP1H. The first outward SP1H is opposed to the first outward SP1G in the axial direction D2. The radial protrusion 32C is configured to abut the first sprocket SP1 in the first outward SP1H. The first sprocket SP1 and SP2 are disposed in the axial direction between the radial protrusion 32C and the second sprocket SP3. The first sprocket SP1 and SP2, the second sprocket SP3, the second sprocket SP4, and the first ring 39A are held between the radial protrusion 32C and the sprocket support member 37 in the axial direction D2. As seen in FIG. 4, the locking member 32 has a tool engaging portion 32F. A tool engaging portion 32F is provided on the inner peripheral surface 32A1 of the tubular body 32A to be engaged with a fastening tool (not shown). In this embodiment, the tool engaging portion 32F includes a plurality of engaging grooves 32G, and the engaging grooves 32G will be threadedly attached to the sprocket support body 28 when the locking member 32 is screwed by the male screw portion 32B and the female screw portion 28A. Engage with fastening tool. As seen in Figures 20 and 21, the sprocket support body 28 includes at least one outer spline tooth 40 that is configured to mesh with the bicycle rear sprocket assembly 14 (Figure 6). The sprocket support body 28 includes at least ten external spline teeth 40 configured to mesh with the bicycle rear sprocket assembly 14 (FIG. 6). That is, at least one external spline tooth 40 includes a plurality of external spline teeth 40. The sprocket support body 28 includes a base support 41 having a tubular shape. The base support 41 extends along the rotation center axis A1. The outer spline teeth 40 extend radially outward from the base support 41. The sprocket support body 28 includes a larger diameter portion 42, a flange 44, and a plurality of spiral outer spline teeth 46. The larger diameter portion 42 and the flange 44 extend radially outward from the base support 41. The larger-diameter portion 42 is provided between the plurality of outer spline teeth 40 and the flange 44 in the axial direction D2. The larger-diameter portion 42 and the flange 44 are provided between the plurality of external spline teeth 40 and the plurality of spiral external spline teeth 46 in the axial direction D2. As seen in FIG. 6, the bicycle rear sprocket assembly 14 is held between the larger-diameter portion 42 and the radial protrusion 32C of the lock member 32 in the axial direction D2. The larger diameter portion 42 may have an internal cavity such that a transmission structure such as a one-way coupling structure may be received within the internal cavity. The larger diameter portion 42 may be omitted from the bicycle rear hub assembly 12 as needed. As seen in FIG. 22, at least one of the at least ten outer spline teeth 40 has an axial spline tooth length SL1. Each of the outer spline teeth 40 has an axial spline tooth length SL1. The axial spline tooth length SL1 is equal to or less than 27 mm. The axial spline tooth length SL1 is equal to or greater than 22 mm. In this embodiment, the axial spline tooth length SL1 is 24. 9 mm. However, the axial spline tooth length SL1 is not limited to this embodiment and the above range. As seen in FIG. 23, the total number of at least ten external spline teeth 40 is equal to or greater than 20. The total number of at least ten external spline teeth 40 is preferably equal to or greater than 25. The total number of at least ten external spline teeth 40 is preferably equal to or greater than 28. The total number of outer spline teeth 40 is preferably equal to or less than 72. In this embodiment, the total number of external spline teeth 40 is 29. However, the total number of external spline teeth 40 is not limited to this embodiment and the above range. At least ten outer spline teeth 40 have a first outer peripheral angle PA11 and a second outer peripheral angle PA12. At least two outer spline teeth of the at least ten outer spline teeth 40 are arranged circumferentially at a first outer pitch angle PA11 with respect to the rotation center axis A1. In other words, at least two of the plurality of external spline teeth 40 are arranged circumferentially with respect to the rotation center axis A1 of the bicycle rear hub assembly 12 at the first external peripheral angle PA11. At least two external spline teeth of the at least ten external spline teeth 40 are arranged circumferentially with respect to the rotation center axis A1 of the bicycle rear hub assembly 12 at the second external peripheral angle PA12. In other words, at least two of the plurality of outer spline teeth 40 are arranged circumferentially with respect to the rotation center axis A1 of the bicycle rear hub assembly 12 at the second outer peripheral angle PA12. In this embodiment, the second outer perimeter angle PA12 is different from the first outer perimeter angle PA11. However, the second outer perimeter angle PA12 may be substantially equal to the first outer perimeter angle PA11. In this embodiment, the outer spline teeth 40 are arranged at the first outer pitch angle PA11 in the circumferential direction D1. Two of the outer spline teeth 40 are arranged at the second outer peripheral angle PA12 in the circumferential direction D1. However, at least two outer spline teeth of the outer spline teeth 40 may be arranged at another outer pitch angle in the circumferential direction D1. The first outer perimeter angle PA11 ranges from 5 degrees to 36 degrees. The first outer perimeter angle PA11 preferably ranges from 10 degrees to 20 degrees. The first outer perimeter angle PA11 is preferably equal to or less than 15 degrees. In this embodiment, the first outer perimeter angle PA11 is 12 degrees. However, the first outer perimeter angle PA11 is not limited to this embodiment and above. The second outer perimeter angle PA12 ranges from 5 degrees to 36 degrees. In this embodiment, the second outer perimeter angle PA12 is 24 degrees. However, the second outer perimeter angle PA12 is not limited to this embodiment and above. At least one of the external spline teeth 40 may be different from the first spline shape of the second spline shape of the other of the external spline teeth 40. At least one of the at least ten outer spline teeth 40 may have a first spline size that is different from a second spline size of the other one of the at least ten outer spline teeth 40. When viewed along the rotation center axis A1, at least one of the external spline teeth 40 has a profile different from that of the other one of the external spline teeth 40. In this embodiment, the outer spline teeth 40X have a first spline shape different from the second spline shape of the other one of the outer spline teeth 40. The outer spline teeth 40X have a first spline size that is different from a second spline size of the other one of the outer spline teeth 40. However, as seen in FIG. 24, at least ten outer spline teeth 40 may have the same spline shape with each other. At least ten external spline teeth 40 may have the same spline size with each other. At least ten outer spline teeth 40 may have the same contour as each other. As seen in FIG. 25, each of the at least ten external spline teeth 40 has an external spline drive surface 48 and an external spline non-drive surface 50. The plurality of external spline teeth 40 include a plurality of external spline transmission surfaces 48 for receiving a transmission rotational force F1 from the bicycle rear sprocket assembly 14 (FIG. 6) during pedaling. The plurality of external spline teeth 40 include a plurality of external spline non-drive surfaces 50. The external spline drive surface 48 may be in contact with the bicycle rear sprocket assembly 14 to receive a transmission rotational force F1 from the bicycle rear sprocket assembly 14 (FIG. 6) during pedaling. The external spline drive surface 48 faces the reverse rotation direction D12. In a state where the bicycle rear sprocket assembly 14 is mounted to the bicycle rear hub assembly 12, the external spline driving surface 48 faces the internal spline driving surface 66 of the bicycle rear sprocket assembly 14. The external spline non-drive surface 50 is provided on the opposite side of the external spline drive surface 48 in the circumferential direction D1. The outer spline non-transmission surface 50 faces the transmission rotation direction D11, so that it does not receive the transmission rotation force F1 from the bicycle rear sprocket assembly 14 during pedaling. In a state where the bicycle rear sprocket assembly 14 is mounted to the bicycle rear hub assembly 12, the external spline non-transmission surface 50 faces the internal spline non-transmission surface 68 of the bicycle rear sprocket assembly 14. At least ten outer spline teeth 40 each have a maximum circumferential width MW1. The outer spline teeth 40 each have a maximum circumferential width MW1. The maximum circumferential width MW1 is defined as the maximum width that receives the thrust F2 applied to the external spline teeth 40. The maximum circumferential width MW1 is defined as the linear distance based on the external spline drive surface 48. The plurality of outer spline drive surfaces 48 each include a radially outermost edge 48A and a radially innermost edge 48B. The outer spline drive surface 48 extends from the radially outermost edge 48A to the radially innermost edge 48B. The first reference circle RC11 is defined on the radially innermost edge 48B and is centered on the rotation center axis A1. The first reference circle RC11 intersects the external spline non-drive surface 50 at a reference point 50R. The maximum circumferential width MW1 extends straight from the radially innermost edge 48B in the circumferential direction D1 to the reference point 50R. The plurality of external spline non-drive surfaces 50 each include a radially outermost edge 50A and a radially innermost edge 50B. The outer spline non-drive surface 50 extends from the radially outermost edge 50A to the radially innermost edge 50B. In this embodiment, the reference point 50R coincides with the radially innermost edge 50B. However, the reference point 50R may be offset from the radially innermost edge 50B. The sum of the maximum circumferential width MW1 is equal to or greater than 55 mm. The sum of the maximum circumferential width MW1 is preferably equal to or greater than 60 mm. The sum of the maximum circumferential width MW1 is preferably equal to or less than 70 mm. In this embodiment, the sum of the maximum circumferential width MW1 is 60. 1 mm. However, the sum of the maximum circumferential width MW1 is not limited to this embodiment and the above range. As seen in FIG. 26, at least one outer spline tooth 40 has an outer spline tip diameter DM11 equal to or less than 34 mm. The external spline top diameter DM11 is equal to or less than 33 mm. The external spline top diameter DM11 is equal to or greater than 29 mm. In this embodiment, the external spline top diameter DM11 is 32. 6 mm. However, the external spline tip diameter DM11 is not limited to this embodiment and above. At least one outer spline tooth 40 has an outer spline base diameter DM12. At least one external spline tooth 40 has an external spline tooth root circle RC12, and the external spline tooth root circle RC12 has an external spline base diameter DM12. However, the external spline tooth root circle RC12 may have another diameter different from the external spline base diameter DM12. The external spline base diameter DM12 is equal to or less than 32 mm. The external spline diameter DM12 is equal to or less than 31 mm. The external spline diameter DM12 is equal to or greater than 28 mm. In this embodiment, the outer diameter DM12 of the external spline is 30. 2 mm. However, the bottom spline diameter DM12 is not limited to this embodiment and above. The larger diameter portion 42 has an outer diameter DM13 that is larger than the outer spline tip diameter DM11. The outer diameter DM13 ranges from 32 mm to 40 mm. In this embodiment, the outer diameter DM13 is 35 mm. However, the outer diameter DM13 is not limited to this embodiment. As seen in FIG. 25, the plurality of outer spline drive surfaces 48 each include a radial length RL11 defined from a radially outermost edge 48A to a radially innermost edge 48B. The sum of the radial lengths RL11 of the plurality of external spline drive surfaces 48 is equal to or greater than 7 mm. The total of the radial length RL11 is equal to or greater than 10 mm. The total radial length RL11 is equal to or greater than 15 mm. The total of the radial length RL11 is equal to or less than 36 mm. In this embodiment, the total of the radial length RL11 is 16. 6 mm. However, the sum of the radial lengths RL11 is not limited to this embodiment. The plurality of outer spline teeth 40 have an additional radial length RL12. The extra radial length RL12 is defined from the outer spline tooth root circle RC12 to the radially outermost end 40A of the plurality of outer spline teeth 40, respectively. The sum of the additional radial lengths RL12 is equal to or greater than 20 mm. In this embodiment, the sum of the additional radial length RL12 is 31. 2 mm. However, the sum of the additional radial lengths RL12 is not limited to this embodiment. At least one of the at least ten external spline teeth 40 is circumferentially symmetrical with respect to the reference line CL1. In a radial direction with respect to the rotation center axis A1, the reference line CL1 extends from the rotation center axis A1 to a circumferential center point CP1 of the radially outermost end 40A of the at least one of the at least ten outer spline teeth 40. However, at least one of the outer spline teeth 40 may have an asymmetric shape with respect to the reference line CL1. The at least one of the at least ten external spline teeth 40 includes an external spline drive surface 48 and an external spline non-drive surface 50. At least one of the plurality of external spline drive surfaces 48 has a first external spline surface angle AG11. The first external spline surface angle AG11 is defined between the external spline transmission surface 48 and the first radial line L11. The first radial line L11 extends from the rotation center axis A1 of the bicycle rear hub assembly 12 to the radially outermost edge 48A of the external spline transmission surface 48. The first outer perimeter angle PA11 or the second outer perimeter angle PA12 is defined between adjacent first radial lines L11 (see, for example, FIG. 23). At least one of the outer spline non-drive surfaces 50 has a second outer spline surface angle AG12. The second external spline surface angle AG12 is defined between the external spline non-drive surface 50 and the second radial line L12. The second radial line L12 extends from the rotation center axis A1 of the bicycle rear hub assembly 12 to the radially outermost edge 50A of the outer spline non-transmission surface 50. In this embodiment, the second external spline surface angle AG12 is equal to the first external spline surface angle AG11. However, the first external spline surface angle AG11 may be different from the second external spline surface angle AG12. The first external spline surface angle AG11 is equal to or less than 6 degrees. The first external spline surface angle AG11 is equal to or greater than 0 degrees. The second external spline surface angle AG12 is equal to or less than 6 degrees. The second external spline surface angle AG12 is equal to or greater than 0 degrees. In this embodiment, the first external spline surface angle AG11 is 5 degrees. The second external spline surface angle AG12 is 5 degrees. However, the first external spline surface angle AG11 and the second external spline surface angle AG12 are not limited to this embodiment and the above range. As seen in Figures 27 and 28, the brake rotor support body 34 includes at least one additional external spline tooth 52 configured to engage the bicycle brake rotor 16 (Figure 1). In this embodiment, the brake rotor support body 34 includes an additional base support 54 and a plurality of additional external spline teeth 52. The additional base support 54 has a tubular shape and extends from the hub body 36 along the rotation center axis A1. The additional outer spline teeth 52 extend radially outward from the additional base support 54. The total number of additional external spline teeth 52 is 52. However, the total number of additional external spline teeth 52 is not limited to this embodiment. As seen in Figure 28, at least one additional external spline tooth 52 has an additional external spline tip diameter DM14. As seen in Figure 29, the additional external spline tip diameter DM14 is larger than the external spline tip diameter DM11. The additional outer spline top diameter DM14 is substantially equal to the outer diameter DM13 of the larger diameter portion 42. However, the additional external spline top diameter DM14 may be equal to or smaller than the external spline top diameter DM11. The additional outer spline top diameter DM14 may be different from the outer diameter DM13 of the larger diameter portion 42. As seen in FIG. 29, the hub body 36 includes a first spoke mounting portion 36A and a second spoke mounting portion 36B. The plurality of first spokes SK1 are coupled to the first spoke mounting portion 36A. A plurality of second spokes SK2 are coupled to the second spoke mounting portion 36B. In this embodiment, the first spoke mounting portion 36A includes a plurality of first attachment holes 36A1. The first spoke SK1 extends through the first attachment hole 36A1. The second spoke mounting portion 36B includes a plurality of second attachment holes 36B1. The second spoke SK2 extends through the second attachment hole 36B1. As used herein, the term "spoke mounting portion" encompasses a configuration in which the spoke mounting opening has a flange-like shape such that the spoke mounting portion extends radially outward with respect to the center axis of rotation of the bicycle rear hub assembly as seen in FIG. And the spoke mounting portion is a configuration of an opening formed directly on a radially outer peripheral surface of the hub body. The second spoke mounting portion 36B is spaced from the first spoke mounting portion 36A in the axial direction D2. The first spoke mounting portion 36A is provided between the sprocket support body 28 and the second spoke mounting portion 36B in the axial direction D2. The second spoke mounting portion 36B is provided between the first spoke mounting portion 36A and the brake rotor support body 34 in the axial direction D2. The first spoke mounting portion 36A has a first axially outermost portion 36C. The second spoke mounting portion 36B has a second axially outermost portion 36D. The first axially outermost portion 36C includes a surface facing the first frame BF1 in the axial direction D2 in a state where the bicycle rear hub assembly 12 is mounted to the bicycle frame BF. The second axially outermost portion 36D includes a surface facing the second frame BF2 in the axial direction D2 in a state where the bicycle rear hub assembly 12 is mounted to the bicycle frame BF. The hub body 36 includes a first axial length AL1. The first axial length AL1 is defined in the axial direction D2 with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14 in the first spoke outermost portion 36C of the first spoke mounting portion 36A and the second spoke mounting portion The second axially outermost portion 36D of 36B. The first axial length AL1 may be equal to or greater than 55 mm. The first axial length AL1 may be equal to or greater than 60 mm. The first axial length AL1 may be equal to or greater than 65 mm. In this embodiment, the first axial length AL1 may be 67 mm. However, the first axial length AL1 is not limited to this embodiment and the above range. Examples of the first axial length AL1 include 55. 7 mm, 62. 3 mm and 67 mm. As seen in FIG. 29, the hub shaft 30 includes a first axial frame abutting surface 30B1 and a second axial frame abutting surface 30C1. After the bicycle rear hub assembly 12 is mounted below the bicycle frame BF, the first axial frame abutment surface 30B1 is configured to abut the bicycle frame in the axial direction D2 relative to the rotation center axis A1 of the bicycle rear sprocket assembly 14 The first part of BF is BF12. The second axial frame abutting surface 30C1 is configured to abut the second portion BF22 of the bicycle frame BF in the axial direction D2 in a state where the bicycle rear hub assembly 12 is mounted to the bicycle frame BF. The first axial frame abutting surface 30B1 is positioned closer to the sprocket support body 28 in the axial direction D2 than the second axial frame abutting surface 30C1. The sprocket support body 28 is disposed between the first axial frame abutting surface 30B1 and the second axial frame abutting surface 30C1 in the axial direction D2. The hub shaft 30 includes a second axial length AL2 defined in the axial direction D2 between the first axial frame abutting surface 30B1 and the second axial frame abutting surface 30C1. The second axial length AL2 may be equal to or greater than 140 mm. The second axial length AL2 may be equal to or greater than 145 mm. The second axial length AL2 may be equal to or greater than 147 mm. The second axial length AL2 may be 148 mm. However, the second axial length AL2 is not limited to this embodiment and the above range. Examples of the second axial length AL2 include 142 mm, 148 mm, and 157 mm. The ratio of the first axial length AL1 to the second axial length AL2 may be equal to or greater than 0. 3. The ratio of the first axial length AL1 to the second axial length AL2 may be equal to or greater than 0. 4. The ratio of the first axial length AL1 to the second axial length AL2 may be equal to or greater than 0. 5. For example, the ratio of the first axial length AL1 (67 mm) to the second axial length AL2 (148 mm) is approximately 0. 45. However, the ratio of the first axial length AL1 to the second axial length AL2 is not limited to this embodiment and the above range. Examples of the ratio of the first axial length AL1 to the second axial length AL2 include approximately 0. 42 (AL1 is 62. 3 mm and AL2 is 148 mm), or approximately 0. 39 (AL1 is 55. 7 mm and AL2 is 142 mm). As seen in FIG. 6, the sprocket support body 28 includes a first axial end 28B, a second axial end 28C, and an axial sprocket abutment surface 28D. The second axial end 28C is opposed to the first axial end 28B in the axial direction D2. The axial center plane CPL bisects the second axial length AL2 in the axial direction D2. The axial sprocket abutment surface 28D is positioned closer to the axial center plane CPL of the bicycle rear hub assembly 12 in the axial direction D2 than the first axial end 28B. The second axial end 28C is positioned axially closer to the axial center plane CPL of the bicycle rear hub assembly 12 in the axial direction D2 than the sprocket abutment surface 28D. In this embodiment, the axial sprocket abutting surface 28D is provided on the larger diameter portion 42, but the axial sprocket abutting surface 28D may be provided on other parts of the bicycle rear hub assembly 12 as required. In a state where the bicycle rear sprocket assembly 14 is mounted on the sprocket support body 28, the axial sprocket abutment surface 28D is in contact with the bicycle rear sprocket assembly 14. The axial sprocket abutment surface 28D faces the first axial end 28B in the axial direction D2. As seen in FIG. 6, the sprocket configuration axial length AL3 is defined in the axial direction D2 between the first axial frame abutting surface 30B1 and the axial sprocket abutting surface 28D of the sprocket support body 28. In this embodiment, the axial length AL3 of the sprocket configuration ranges from 35 mm to 45 mm. For example, the sprocket configuration axial length AL3 is 39. 64 mm. For example, by omitting the larger diameter portion 42, the sprocket configuration axial length AL3 can also be extended up to 44. 25 mm. However, the sprocket arrangement axial length AL3 is not limited to this embodiment and the above range. The larger diameter portion 42 has an axial end 42A furthest from the first axial frame abutment surface 30B1 in the axial direction D2. The additional axial length AL4 is defined in the axial direction D2 from the first axial frame abutment surface 30B1 to the axial end 42A. The extra axial length AL4 ranges from 38 mm to 47 mm. Additional axial length AL4 can range from 44 mm to 45 mm. Additional axial length AL4 can also range from 40 mm to 41 mm. In this embodiment, the additional axial length AL4 is 44. 25 mm. However, the additional axial length AL4 is not limited to this embodiment and above. The larger-diameter axial length AL5 of the larger-diameter portion 42 ranges from 3 mm to 6 mm. In this embodiment, the larger diameter axial length AL5 is 4. 61 mm. However, the larger-diameter axial length AL5 is not limited to this embodiment and above. The ratio of the first axial length AL1 to the sprocket configuration axial length AL3 ranges from 1. 2 to 1. 7. For example, if the first axial length AL1 is 55. 7 mm and sprocket configuration with axial length AL3 of 39. 64 mm, the ratio of the first axial length AL1 to the sprocket configuration axial length AL3 is 1. 4. However, the ratio of the first axial length AL1 to the sprocket configuration axial length AL3 is not limited to this embodiment and the above range. For example, if the first axial length AL1 is 62. 3 mm and sprocket configuration with axial length AL3 of 39. 64 mm, the ratio of the first axial length AL1 to the sprocket configuration axial length AL3 can be 1. 57, or if the first axial length AL1 is 67 mm and the sprocket configuration axial length AL3 is 39. 64 mm, the ratio of the first axial length AL1 to the sprocket configuration axial length AL3 can be 1. 69. As seen in FIG. 30, the sprocket support member 37 includes a hub engaging portion 60 and a plurality of support arms 62. A plurality of support arms 62 extend radially outward from the hub engaging portion 60. The support arm 62 includes first to eighth attachment portions 62A to 62H. The plurality of spacers 38 include a plurality of first spacers 38A, a plurality of second spacers 38B, a plurality of third spacers 38C, a plurality of fourth spacers 38D, a plurality of fifth spacers 38E, and a plurality of sixths. The spacer 38F and the plurality of seventh spacers 38G. As seen in FIG. 6, the first spacer 38A is disposed between the additional sprockets SP5 and SP6. The second spacer 38B is disposed between the additional sprockets SP6 and SP7. The third spacer 38C is disposed between the additional sprockets SP7 and SP8. The fourth spacer 38D is disposed between the additional sprockets SP8 and SP9. The fifth spacer 38E is disposed between the additional sprockets SP9 and SP10. The sixth spacer 38F is disposed between the additional sprockets SP10 and SP11. The seventh spacer 38G is disposed between the additional sprockets SP11 and SP12. The additional sprocket SP6 and the first spacer 38A are attached to the first attachment portion 62A by an adhesive 37A. The additional sprocket SP7 and the second spacer 38B are attached to the second attachment portion 62B by an adhesive 37A. The additional sprocket SP8 and the third spacer 38C are attached to the third attachment portion 62C by the adhesive 37A. The additional sprocket SP9 and the fourth spacer 38D are attached to the fourth attachment portion 62D by the adhesive 37A. The additional sprocket SP10 and the fifth spacer 38E are attached to the fifth attachment portion 62E by an adhesive 37A. The additional sprocket SP11 and the sixth spacer 38F are attached to the sixth attachment portion 62F by the adhesive 37A. The additional sprocket SP12 and the seventh spacer 38G are attached to the seventh attachment portion 62G by the adhesive 37A. The additional sprockets SP5 and 39B are attached to the eighth attachment portion 62H by the adhesive 37A. The hub engaging portion 60, the sprocket SP1 to SP4, the first ring 39A, and the second ring 39B are held between the larger-diameter portion 42 and the radial protrusion 32C of the lock member 32 in the axial direction D2. In this embodiment, each of the sprockets SP1 to SP12 is made of a metal material such as aluminum, iron, or titanium. The sprocket support member 37 is made of a non-metal material including a resin material. Each of the first to seventh spacers 38A to 38G, the first ring 39A, and the second ring 39B is made of a non-metal material such as a resin material. However, at least one of the sprockets SP1 to SP12 may be made at least partially of a non-metal material. Each of the sprocket support member 37, the first to seventh spacers 38A to 38G, the first ring 39A, and the second ring 39B is made at least partially of a metal material such as aluminum, iron, or titanium. As seen in FIG. 7, the first sprocket SP1 includes a first opening SP1K. The first opening SP1K has a first minimum diameter MD1. As seen in FIG. 31, in a state where the bicycle rear sprocket assembly 14 is mounted to the sprocket support body 28, the tubular body 32A of the lock member 32 extends through the first opening SP1K of the first sprocket SP1. In a state where the bicycle rear sprocket assembly 14 is mounted to the sprocket support body 28, the first opening SP1K of the first sprocket SP1 is configured so that the first axial end 32D of the tubular body 32A of the locking member 32 passes through the first A first opening SP1K of a sprocket SP1. The first axial end 28B of the sprocket support body 28 is spaced from the first opening SP1K of the first sprocket SP1 without extending through the first opening SP1K. The first minimum diameter MD1 is smaller than the minimum outer diameter MD28 of the sprocket support body 28 of the bicycle rear hub assembly 12. In this embodiment, the minimum outer diameter MD28 is equal to the outer spline base diameter DM12 of the plurality of outer spline teeth 40 of the sprocket support body 28 (FIG. 26). As seen in FIG. 31, the tubular body 32A has a first outer diameter ED1 equal to or less than 27 mm. The first outer diameter ED1 is equal to or greater than 26 mm. The radial protrusion 32C has a second outer diameter ED2 equal to or smaller than 32 mm. The second outer diameter ED2 is equal to or greater than 30 mm. In this embodiment, the first outer diameter ED1 is 26. 2 mm. The second outer diameter ED2 is 30. 8 mm. However, at least one of the first outer diameter ED1 and the second outer diameter ED2 is not limited to this embodiment and the above range. The radial protrusion 32C has an axial width ED3 defined in the axial direction D2. For example, the axial width ED3 of the radial protrusion 32C is 2 mm. However, the axial width ED3 is not limited to this embodiment. The locking member 32 has an axial length ED4 defined in the axial direction D2 from the radial protrusion 32C toward the first axial end 32D. The axial length ED4 of the locking member 32 is 10 mm. However, the axial length ED4 is not limited to this embodiment. As seen in FIG. 8, the first sprocket SP2 includes a first opening SP2K. That is, the plurality of first sprockets SP1 and SP2 each include a first opening. The first opening SP2K has a first minimum diameter MD2. As seen in FIG. 31, in a state where the bicycle rear sprocket assembly 14 is mounted to the sprocket support body 28, the tubular body 32A of the lock member 32 extends through the first opening SP2K of the first sprocket SP2. The first axial end 28B of the sprocket support body 28 is spaced from the first opening SP2K of the first sprocket SP2 without extending through the first opening SP2K. The first minimum diameter MD2 is smaller than the minimum outer diameter MD28 of the sprocket support body 28 of the bicycle rear hub assembly 12. As seen in FIG. 9, the second sprocket SP3 includes a second opening SP3K. The second opening SP3K has a second smallest diameter MD3. As seen in FIG. 31, in a state where the bicycle rear sprocket assembly 14 is mounted to the sprocket support body 28, the tubular body 32A of the lock member 32 and the sprocket support body 28 extend through the second opening of the second sprocket SP3 SP3K. The first axial end 28B of the sprocket support body 28 is disposed between the second opening SP3K and the first opening SP1K in the axial direction D2. The first axial end 28B of the sprocket support body 28 is disposed between the second opening SP3K and the first opening SP2K in the axial direction D2. The second minimum diameter MD3 is equal to or larger than the minimum outer diameter MD28 of the sprocket support body 28 of the bicycle rear hub assembly 12. As seen in FIG. 10, the second sprocket SP4 includes a second opening SP4K. That is, the plurality of second sprockets SP3 and SP4 each include a second opening. The second opening SP4K has a second smallest diameter MD4. As seen in FIG. 31, in a state where the bicycle rear sprocket assembly 14 is mounted to the sprocket support body 28, the sprocket support body 28 extends through the second opening SP4K of the second sprocket SP4. The first axial end 28B of the sprocket support body 28 is disposed between the second opening SP4K and the first opening SP1K in the axial direction D2. The second minimum diameter MD4 is equal to or larger than the minimum outer diameter MD28 of the sprocket support body 28 of the bicycle rear hub assembly 12. As seen in FIG. 32, the first sprocket SP2 includes at least ten internal spline teeth 63 configured to mesh with the sprocket support body 28 of the bicycle rear hub assembly 12. At least ten internal spline teeth 63 are provided to the first opening SP2K. At least ten internal spline teeth 63 are provided as the first torque transmitting structure of the first sprocket SP2, as described later. The total number of the at least ten internal spline teeth 63 of the first sprocket SP2 is equal to or greater than 20. The total number of at least ten internal spline teeth 63 of the first sprocket SP2 is equal to or greater than 28. The total number of internal spline teeth 63 is equal to or less than 72. In this embodiment, the total number of the internal spline teeth 63 is 29. However, the total number of the internal spline teeth 63 is not limited to this embodiment and the above range. As seen in FIG. 9, the second sprocket SP3 includes at least ten internal spline teeth 64 configured to mesh with the sprocket support body 28 of the bicycle rear hub assembly 12. In this embodiment, at least ten internal spline teeth 64 of the second sprocket SP3 define the second smallest diameter MD3 as the internal spline top diameter of the at least ten internal spline teeth 64. The total number of the at least ten internal spline teeth 64 of the second sprocket SP3 is equal to or greater than 20. The total number of the at least ten internal spline teeth 64 of the second sprocket SP3 is equal to or greater than 28. The total number of internal spline teeth 64 is equal to or less than 72. In this embodiment, the total number of internal spline teeth 64 is 29. However, the total number of internal spline teeth 64 is not limited to this embodiment and the above range. As seen in FIG. 10, the second sprocket SP4 includes at least ten internal spline teeth 65 configured to mesh with the sprocket support body 28 of the bicycle rear hub assembly 12. That is, the plurality of second sprockets SP3 and SP4 each include at least ten internal spline teeth configured to mesh with the sprocket support body 28 of the bicycle rear hub assembly 12. In this embodiment, at least ten internal spline teeth 65 of the second sprocket SP4 define the second smallest diameter MD4 as the internal spline top diameter of at least ten internal spline teeth 65. The total number of the at least ten internal spline teeth 65 of the second sprocket SP4 is equal to or greater than 20. The total number of the at least ten internal spline teeth 65 of the second sprocket SP4 is equal to or greater than 28. The total number of internal spline teeth 65 is equal to or less than 72. In this embodiment, the total number of internal spline teeth 65 is 29. However, the total number of internal spline teeth 65 is not limited to this embodiment and the above range. As seen in FIG. 33, at least ten internal spline teeth 64 of the second sprocket SP3 have a first internal peripheral angle PA21 and a second internal peripheral angle PA22. At least two of the at least ten internal spline teeth 64 of the second sprocket SP3 are arranged circumferentially with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14 at the first internal peripheral angle PA21. At least two of the at least ten internal spline teeth 64 are adjacent to each other in the circumferential direction D1 without another spline tooth therebetween. In other words, at least two of the plurality of internal spline teeth 64 are arranged circumferentially with respect to the center axis A1 of rotation of the bicycle rear sprocket assembly 14 at the first internal peripheral angle PA21. At least two other internal spline teeth of the at least ten internal spline teeth 64 of the second sprocket SP3 are arranged circumferentially at the second internal peripheral angle PA22 with respect to the rotation center axis A1. At least two other internal spline teeth of at least ten spline teeth 64 of the second sprocket SP3 are adjacent to each other in the circumferential direction D1 without another spline tooth therebetween. In other words, at least two of the plurality of internal spline teeth 64 of the second sprocket SP3 are arranged circumferentially at the second internal peripheral angle PA22 with respect to the rotation center axis A1. In this embodiment, the second internal perimeter angle PA22 is different from the first internal perimeter angle PA21. However, the second internal perimeter angle PA22 may be substantially equal to the first internal perimeter angle PA21. In this embodiment, the internal spline teeth 64 are arranged along the circumference at the first internal pitch angle PA21 in the circumferential direction D1. Two of the internal spline teeth 64 are arranged at the second internal peripheral angle PA22 in the circumferential direction D1. However, at least two of the internal spline teeth 64 may be arranged at another internal peripheral angle in the circumferential direction D1. The first internal perimeter angle PA21 ranges from 5 degrees to 36 degrees. The first internal perimeter angle PA21 ranges from 10 degrees to 20 degrees. The first internal perimeter angle PA21 is equal to or less than 15 degrees. In this embodiment, for example, the first internal perimeter angle PA21 is 12 degrees. However, the first internal perimeter angle PA21 is not limited to this embodiment and above. The second inner perimeter angle PA22 ranges from 5 degrees to 36 degrees. In this embodiment, the second inner perimeter angle PA22 is 24 degrees. However, the second internal perimeter angle PA22 is not limited to this embodiment and the above range. At least one of the at least ten internal spline teeth 64 of the second sprocket SP3 has a first spline shape different from a second spline shape of the other one of the at least ten internal spline teeth 64. At least one of the at least ten internal spline teeth 64 of the second sprocket SP3 has a first spline size that is different from a second spline size of the other one of the at least ten internal spline teeth 64. At least one of the at least ten internal spline teeth 64 has a cross-sectional shape that is different from the cross-sectional shape of the other one of the at least ten internal spline teeth 64. However, as seen in FIG. 34, the internal spline teeth 64 may have the same shape as each other. At least ten internal spline teeth 64 may have the same size as each other. At least ten internal spline teeth 64 may have the same cross-sectional shape with each other. As seen in FIG. 35, at least one of the at least ten internal spline teeth 64 includes an internal spline drive surface 66. At least one of the at least ten internal spline teeth 64 includes an internal spline non-drive surface 68. The at least ten internal spline teeth 64 include a plurality of internal spline drive surfaces 66 to receive a drive rotational force F1 from the bicycle rear hub assembly 12 (FIG. 6) during pedaling. At least ten internal spline teeth 64 include a plurality of internal spline non-drive surfaces 68. The internal spline transmission surface 66 may be in contact with the sprocket support body 28 to transmit a transmission rotational force F1 from the sprocket SP1 to the sprocket support body 28 during stepping. The internal spline drive surface 66 faces the drive rotation direction D11. In a state where the bicycle rear sprocket assembly 14 is mounted to the bicycle rear hub assembly 12, the internal spline driving surface 66 faces the internal spline driving surface 48 of the bicycle rear hub assembly 12. The internal spline non-drive surface 68 is provided on the opposite side of the internal spline drive surface 66 in the circumferential direction D1. The internal spline non-transmission surface 68 faces the reverse rotation direction D12 so that the transmission rotational force F1 is not transmitted from the sprocket SP1 to the sprocket support body 28 during the stepping. In a state where the bicycle rear sprocket assembly 14 is mounted to the bicycle rear hub assembly 12, the external spline non-transmission surface 68 faces the internal spline non-transmission surface 50 of the bicycle rear hub assembly 12. At least ten internal spline teeth 64 each have a maximum circumferential width MW2. The internal spline teeth 64 each have a maximum circumferential width MW2. The maximum circumferential width MW2 is defined as the maximum width that receives the thrust force F3 applied to the internal spline teeth 64. The maximum circumferential width MW2 is defined as the linear distance based on the internal spline drive surface 66. Each of the plurality of internal spline drive surfaces 66 includes a radially outermost edge 66A and a radially innermost edge 66B. The second reference circle RC21 is defined on the radially outermost edge 66A and is centered on the rotation center axis A1. The second reference circle RC21 intersects the internal spline non-drive surface 68 at a reference point 68R. The maximum circumferential width MW2 extends straight from the radially innermost edge 66B to the reference point 68R in the circumferential direction D1. The internal splined non-drive surface 68 includes a radially outermost edge 68A and a radially innermost edge 68B. The internal splined non-drive surface 68 extends from the radially outermost edge 68A to the radially innermost edge 68B. The reference point 68R is provided between the radially outermost edge 68A and the radially innermost edge 68B. The sum of the maximum circumferential width MW2 is equal to or greater than 40 mm. The sum of the maximum circumferential width MW2 may be equal to or greater than 45 mm. The sum of the maximum circumferential width MW2 may be equal to or greater than 50 mm. In this embodiment, the sum of the maximum circumferential width MW2 is 50. 8 mm. However, the total of the maximum circumferential width MW2 is not limited to this embodiment. As seen in FIG. 36, at least ten internal spline teeth 64 of the second sprocket SP3 have an internal spline base diameter DM21. At least one internal spline tooth 64 of the second sprocket SP3 has an internal spline tooth root circle RC22 having an internal spline bottom diameter DM21. The internal spline diameter DM21 is equal to or less than 34 mm. The internal spline diameter DM21 of the second sprocket SP3 is equal to or less than 33 mm. The internal spline diameter DM21 of the second sprocket SP3 is equal to or greater than 29 mm. In this embodiment, the internal spline diameter DM21 of the second sprocket SP3 is 32. 8 mm. However, the bottom spline diameter DM21 of the second sprocket SP3 is not limited to this embodiment and the above. At least ten internal spline teeth 64 of the second sprocket SP3 have an internal spline top diameter DM22 equal to or smaller than 32 mm. The internal spline top diameter DM22 is equal to or less than 31 mm. The internal spline top diameter DM22 is equal to or greater than 28 mm. In this embodiment, the internal spline top diameter DM22 is 30. 4 mm. However, the internal spline tip diameter DM22 is not limited to this embodiment and above. As seen in FIG. 18, the additional sprocket SP12 has a maximum tooth tip diameter TD12. The maximum tooth tip diameter TD12 is a maximum outer diameter defined by a plurality of sprocket teeth SP12B. The ratio of the internal spline base diameter DM21 (Figure 36) to the maximum tooth tip diameter TD12 ranges from 0. 15 to 0. 18. In this embodiment, the ratio of the internal spline bottom diameter DM21 to the maximum tooth tip diameter TD12 is 0. 15. However, the ratio of the internal spline bottom diameter DM21 to the maximum tooth tip diameter TD12 is not limited to this embodiment and the above range. As seen in FIG. 35, the plurality of internal spline drive surfaces 66 include a radially outermost edge 66A and a radially innermost edge 66B. Each of the plurality of internal spline drive surfaces 66 includes a radial length RL21 defined from a radially outermost edge 66A to a radially innermost edge 66B. The sum of the radial lengths RL21 of the plurality of internal spline drive surfaces 66 is equal to or greater than 7 mm. The total of the radial length RL21 is equal to or greater than 10 mm. The total of the radial length RL21 is equal to or greater than 15 mm. In this embodiment, the sum of the radial lengths RL21 is equal to or less than 36 mm. In this embodiment, the total of the radial length RL21 is 16. 6 mm However, the total of the radial length RL21 is not limited to this embodiment and the above range. The plurality of internal spline teeth 64 have an additional radial length RL22. The extra radial length RL22 is defined from the inner spline tooth root circle RC22 to the radially innermost end 64A of the plurality of inner spline teeth 64, respectively. The sum of the additional radial lengths RL22 is equal to or greater than 12 mm. In this embodiment, the sum of the additional radial length RL22 is 34. 8 mm. However, the sum of the additional radial lengths RL22 is not limited to this embodiment and the above range. At least one of the at least ten internal spline teeth 64 of the second sprocket SP3 is circumferentially symmetrical with respect to the reference line CL2. In a radial direction with respect to the rotation center axis A1, the reference line CL2 extends from the rotation center axis A1 to a circumferential center point CP2 of the radially outermost end 64A of the at least one of the at least ten internal spline teeth 64. However, at least one of the internal spline teeth 64 may have an asymmetric shape with respect to the reference line CL2. At least one of the internal spline teeth 64 includes an internal spline drive surface 66 and an internal spline non-drive surface 68. The internal spline drive surface 66 has a first internal spline surface angle AG21. The first internal spline surface angle AG21 is defined between the internal spline transmission surface 66 and the first radial line L21. The first radial line L21 extends from the rotation center axis A1 of the bicycle rear sprocket assembly 14 to the radially outermost edge 66A of the internal spline transmission surface 66. The first inner perimeter angle PA21 or the second inner perimeter angle PA22 is defined between adjacent first radial lines L21 (see, for example, FIG. 33). The internal spline non-drive surface 68 has a second internal spline surface angle AG22. The second internal spline surface angle AG22 is defined between the internal spline non-drive surface 68 and the second radial line L22. The second radial line L22 extends from the rotation center axis A1 of the bicycle rear sprocket assembly 14 to the radially outermost edge 68A of the internal spline non-transmission surface 68. In this embodiment, the second internal spline surface angle AG22 is equal to the first internal spline surface angle AG21. However, the first internal spline surface angle AG21 may be different from the second internal spline surface angle AG22. The first internal spline surface angle AG21 is between 0 degrees and 6 degrees. The second internal spline surface angle AG22 ranges from 0 degrees to 6 degrees. In this embodiment, the first internal spline surface angle AG21 is 5 degrees. The second internal spline surface angle AG22 is 5 degrees. However, the first internal spline surface angle AG21 and the second internal spline surface angle AG22 are not limited to this embodiment and the above range. As seen in FIG. 37, the internal spline teeth 64 mesh with the external spline teeth 40 to transmit a transmission rotational force F1 from the second sprocket SP3 to the sprocket support body 28. The internal spline transmission surface 66 may be in contact with the external spline transmission surface 48 to transmit a transmission rotational force F1 from the second sprocket SP3 to the sprocket support body 28. In a state where the internal spline drive surface 66 is in contact with the external spline drive surface 48, the internal spline non-drive surface 68 is spaced from the external spline non-drive surface 50. The internal spline teeth 63 of the first sprocket SP2 and the internal spline teeth 65 of the second sprocket SP4 and the internal spline teeth 64 of the second sprocket SP3 have substantially the same structure. Therefore, for brevity, it will not be described in detail here. As seen in FIG. 2, the sprocket support member 37 includes at least ten internal spline teeth 76 configured to mesh with the sprocket support body 28 of the bicycle rear hub assembly 12. The plurality of internal spline teeth 76 have substantially the same structure as the structure of the plurality of internal spline teeth 64. Therefore, for brevity, it will not be described in detail here. As seen in FIG. 38, the first sprocket SP1 includes a first torque transmitting structure SP1T provided to the first inward SP1H to directly or indirectly transmit stepping torque to the sprocket support body 28. In this embodiment, the first torque transmitting structure SP1T includes a plurality of first torque transmitting teeth SP1T1 to indirectly transmit the pedaling torque to the sprocket support body 28. The first torque transmitting structure SP1T includes at least ten first torque transmitting teeth SP1T1. Preferably, the total number of at least ten first torque transmitting teeth SP1T1 is equal to or greater than 20. More preferably, the total number of at least ten first torque transmitting teeth SP1T1 is equal to or greater than 28. In this embodiment, the total number of at least ten first torque transmitting teeth SP1T1 is 29. However, the total number of at least ten first torque transmitting teeth SP1T1 is not limited to this embodiment and above. As seen in FIGS. 38 and 39, the first sprocket SP2 includes a first inward SP2H and a first outward SP2G. With respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14, the first outward SP2G is opposed to the first inward SP2H in the axial direction D2. The first sprocket SP2 includes a first torque transmitting structure SP2M provided to the first inward SP2H to directly or indirectly transmit the pedaling torque to the sprocket support body 28. In this embodiment, the internal spline teeth 63 of the first sprocket SP2 may also be referred to as the first torque transmitting teeth 63. The first torque transmitting structure SP2M includes a plurality of first torque transmitting teeth 63 to directly transmit the pedaling torque to the sprocket support body 28. The first torque transmitting structure SP2M includes at least ten first torque transmitting teeth 63. Preferably, the total number of the at least ten first torque transmitting teeth 63 is equal to or greater than 20. More preferably, the total number of at least ten first torque transmitting teeth 63 is equal to or greater than 28. In this embodiment, the total number of the at least ten first torque transmitting teeth 63 is 29. However, the total number of at least ten first torque transmitting teeth 63 is not limited to this embodiment and the above range. The first torque transmitting tooth 63 may also be referred to as an internal spline tooth 63. As seen in FIG. 39, the first sprocket SP2 includes a second torque transmitting structure SP2T to receive the pedaling torque from the first sprocket SP1. The second torque transmitting structure SP2T is disposed on the first outward SP2G. In this embodiment, the second torque transmitting structure SP2T includes a plurality of second torque transmitting teeth SP2T1. Preferably, the total number of the second torque transmitting teeth SP2T1 is equal to or greater than 20. More preferably, the total number of the second torque transmitting teeth SP2T1 is equal to or greater than 28. In this embodiment, the total number of the second torque transmitting teeth SP2T1 is 29. However, the total number of the second torque transmitting teeth SP2T1 is not limited to this embodiment and the above range. The first torque transmitting structure SP1T is engaged with the second torque transmitting structure SP2T. The plurality of first torque transmitting teeth SP1T1 are meshed with the plurality of second torque transmitting teeth SP2T1 to transmit a transmission rotational force F1. As seen in FIGS. 23 and 24, the sprocket support body 28 includes a hub indicator 28I provided at an axial end of the base support 41. When viewed along the rotation center axis A1, the hub indicator 28I is disposed in the area of the second outer perimeter angle PA12. In this embodiment, the hub indicator 28I includes a dot. However, the hub indicator 28I may include other shapes, such as a triangle and a line. In addition, the hub indicator 28I may be a separate member attached to the sprocket support body 28 by a joining structure such as an adhesive. The position of the hub indicator 28I is not limited to this embodiment. As seen in FIG. 7, the first sprocket SP1 includes a sprocket indicator SP1I provided at an axial end of the sprocket body SP1A. In this embodiment, the sprocket indicator SP1I includes a dot. However, the sprocket indicator SP1I may include other shapes such as a triangle and a line. In addition, the sprocket indicator SP1I may be a separate member attached to the sprocket SP1 by a joining structure such as an adhesive. The position of the sprocket indicator SP1I is not limited to this embodiment. The sprocket indicator SP1I can be provided to any of the other sprockets SP2 to SP12. A sprocket indicator SP1I may also be provided to the sprocket support member 37. As seen in FIG. 6, the bicycle rear hub assembly 12 further includes a free wheel structure 78. The sprocket support body 28 is operatively coupled to the hub body 36 by a free wheel structure 78. The free wheel structure 78 is configured to couple the sprocket support body 28 to the hub body 36 to rotate the sprocket support body 28 together with the hub body 36 in the transmission rotation direction D11 (FIG. 5) during stepping. The free wheel structure 78 is configured to allow the sprocket support body 28 to rotate relative to the hub body 36 in the opposite direction of rotation D12 (FIG. 5) during idle rotation. Therefore, the free wheel structure 78 can be interpreted as a one-way coupling structure 78. The free wheel structure 78 will be described in detail later. The bicycle rear hub assembly 12 includes a first bearing 79A and a second bearing 79B. The first bearing 79A and the second bearing 79B are disposed between the sprocket support body 28 and the hub shaft 30 to rotatably support the sprocket support body 28 relative to the hub shaft 30 about a rotation center axis A1. In this embodiment, each of the sprocket support body 28, the brake rotor support body 34, and the hub body 36 is made of a metal material such as aluminum, iron, or titanium. However, at least one of the sprocket support body 28, the brake rotor support body 34, and the hub body 36 may be made of a non-metal material. As seen in FIG. 40, the free wheel structure 78 includes a first ratchet member 80 and a second ratchet member 82. The first ratchet member 80 is configured to mesh with one of the hub body 36 and the sprocket support body 28 in a torque transmitting manner. The second ratchet member 82 is configured to mesh with the other of the hub body 36 and the sprocket support body 28 in a torque transmitting manner. In this embodiment, the first ratchet member 80 meshes with the sprocket support body 28 in a torque transmitting manner. The second ratchet member 82 meshes with the hub body 36 in a torque transmitting manner. However, the first ratchet member 80 may be configured to mesh with the hub body 36 in a torque transmitting manner. The second ratchet member 82 may be configured to mesh with the sprocket support body 28 in a torque transmitting manner. The first ratchet member 80 is mounted to the sprocket support body 28 to rotate about the rotation center axis A1 with the sprocket support body 28 relative to the hub body 36. The second ratchet member 82 is mounted to the hub body 36 to rotate about the rotation center axis A1 with the hub body 36 relative to the sprocket support body 28. Each of the first ratchet member 80 and the second ratchet member 82 has a ring shape. At least one of the first ratchet member 80 and the second ratchet member 82 is movable relative to the hub shaft 30 in the axial direction D2 with respect to the rotation center axis A1. In this embodiment, each of the first ratchet member 80 and the second ratchet member 82 is movable relative to the hub shaft 30 in the axial direction D2. The second ratchet member 82 is movable relative to the hub body 36 in the axial direction D2. The first ratchet member 80 is movable relative to the sprocket support body 28 in the axial direction D2. The hub body 36 includes a free wheel housing 36H having an annular shape. The free wheel housing 36H extends in the axial direction D2. The first ratchet member 80 and the second ratchet member 82 are installed in the free wheel housing 36H in an assembled state. As seen in FIG. 41, the first ratchet member 80 includes at least one first ratchet tooth 80A. In this embodiment, at least one first ratchet tooth 80A includes a plurality of first ratchet teeth 80A. The plurality of first ratchet teeth 80A are arranged in the circumferential direction D1 to provide saw teeth. As seen in FIG. 42, the second ratchet member 82 includes at least one second ratchet tooth 82A that is configured to mesh with at least one first ratchet tooth 80A in a torque transmitting manner. At least one second ratchet tooth 82A is engaged with at least one first ratchet tooth 80A to transmit a rotational force F1 from the sprocket support body 28 to the hub body 36 (FIG. 40). In this embodiment, the at least one second ratchet tooth 82A includes a plurality of second ratchet teeth 82A configured to mesh with the plurality of first ratchet teeth 80A in a torque transmitting manner. The plurality of second ratchet teeth 82A are arranged in the circumferential direction D1 to provide a sawtooth. The plurality of second ratchet teeth 82A can be engaged with the plurality of first ratchet teeth 80A. In a state where the second ratchet tooth 82A is engaged with the first ratchet tooth 80A, the first ratchet member 80 rotates together with the second ratchet member 82. As seen in FIGS. 41 and 42, the sprocket support body 28 has an outer peripheral surface 28P having a first spiral spline 28H. The first ratchet member 80 is configured to mesh with the sprocket support body 28 in a torque transmitting manner, and includes a second spiral spline 80H that cooperates with the first spiral spline 28H. The first ratchet member 80 is in the axial direction D2 with respect to the sprocket support body 28 via the second spiral spline 80H mated with the first spiral spline 28H during the first thrust transmission applied from the sprocket support body 28 Removable installation. In this embodiment, the first spiral spline 28H includes a plurality of spiral outer spline teeth 46. The second spiral spline 80H includes a plurality of spiral internal spline teeth 80H1 that cooperate with a plurality of spiral external spline teeth 46. As seen in FIG. 43, the hub body 36 includes an inner peripheral surface 36S and at least one first tooth 36T. At least one first tooth 36T is provided on the inner peripheral surface 36S. In this embodiment, the free wheel housing 36H includes an inner peripheral surface 36S. The hub body 36 includes a plurality of first teeth 36T. The plurality of first teeth 36T are disposed on the inner peripheral surface 36S and extend radially inward from the inner peripheral surface 36S with respect to the rotation center axis A1. The first teeth 36T are arranged in the circumferential direction D1 to define a plurality of grooves 36R between adjacent two teeth in the first teeth 36T. The second ratchet member 82 includes a hub body engaging portion 82E, and the hub body engaging portion 82E meshes with the hub body 36 in a torque transmitting manner via the hub body engaging portion 82E to transmit the rotational force F1 from the first ratchet member 80 to the hub body 36. One of the hub body engaging portion 82E and the hub body 36 includes at least one protrusion extending radially. The other of the hub body engaging portion 82E and the hub body 36 includes at least one groove to be engaged with the at least one protruding portion. In this embodiment, the hub body engaging portion 82E includes at least one projection 82T extending radially as at least one projection. The hub body 36 includes at least one groove 36R that engages with at least one protrusion 82T. In this embodiment, the hub body engaging portion 82E includes a plurality of protrusions 82T. The plurality of protrusions 82T are engaged with the plurality of grooves 36R. As seen in FIG. 42, the outer peripheral surface 28P of the sprocket support body 28 has a guide portion 28G configured to guide the first ratchet member 80 toward the hub body 36 during idle rotation. The guide portion 28G is configured to define an obtuse angle AG28 with the first spiral spline 28H (FIG. 48). The sprocket support body 28 includes a plurality of guide portions 28G. The guide portion 28G is configured to guide the first ratchet member 80 toward the hub body 36 during idling or idling. The guide portion 28G guides the first ratchet member 80 toward the hub body 36 during idle rotation to release the mating engagement between at least one first ratchet tooth 80A (FIG. 41) and at least one second ratchet tooth 82A. The guide portion 28G is configured to move the first ratchet member 80 away from the second ratchet member 82 in the axial direction D2. The guide portion 28G extends at least in the circumferential direction D1 with respect to the sprocket support body 28. The guide portion 28G extends from at least one of the plurality of spiral external spline teeth 46 in the circumferential direction D1. Although the guide portion 28G and the spiral outer spline teeth 46 are integrally provided as a one-piece integral member in this embodiment, the guide portion 28G may be a separate member from the plurality of spiral outer spline teeth 46. Due to the guide portion 28G, the first ratchet member 80 and the second ratchet member 82 are smoothly disengaged from each other during idle rotation, especially when the guide portion 28G is configured to define an obtuse angle AG28 relative to the first spiral spline 28H . This also causes noise reduction during idling, because at least one first ratchet tooth 80A and at least one second ratchet tooth 82A are smoothly separated from each other during idling. As seen in FIG. 40, the bicycle rear hub assembly 12 further includes a biasing member 84. The biasing member 84 is disposed between the hub body 36 and the first ratchet member 80 to bias the first ratchet member 80 toward the second ratchet member 82 in the axial direction D2. For example, in this embodiment, the biasing member 84 is a compression spring. As seen in FIG. 44, the biasing member 84 is compressed between the hub body 36 and the first ratchet member 80 in the axial direction D2. The biasing member 84 biases the first ratchet member 80 toward the second ratchet member 82 to maintain the meshing state where the first ratchet member 80 and the second ratchet member 82 mesh with each other via the first ratchet teeth 80A and the second ratchet teeth 82A. Preferably, the biasing member 84 is engaged with the hub body 36 to rotate with the hub body 36. The biasing member 84 is mounted to the hub body 36 to rotate together with the hub body 36 about a rotation center axis A1 (FIG. 40). The biasing member 84 includes a curled body 84A and a connection end 84B. The hub body 36 includes a connection hole 36F. The connection end 84B is provided in the connection hole 36F so that the biasing member 84 rotates together with the hub body 36 about the rotation center axis A1 (FIG. 40). As seen in FIG. 44, the outer peripheral surface 28P of the sprocket support body 28 supports the first ratchet member 80 and the second ratchet member 82. The first ratchet member 80 includes an axial surface 80S facing the axial direction D2. At least one first ratchet tooth 80A is disposed on the axial surface 80S of the first ratchet member 80. In this embodiment, a plurality of first ratchet teeth 80A are disposed on the axial surface 80S of the first ratchet member 80. The axial surface 80S is substantially perpendicular to the axial direction D2. However, the axial surface 80S may not be perpendicular to the axial direction D2. The second ratchet member 82 includes an axial surface 82S facing the axial direction D2. At least one second ratchet tooth 82A is disposed on the axial surface 82S of the second ratchet member 82. The axial surface 82S of the second ratchet member 82 faces the axial surface 80S of the first ratchet member 80. In this embodiment, a plurality of second ratchet teeth 82A are disposed on the axial surface 82S of the second ratchet member 82. The axial surface 82S is substantially perpendicular to the axial direction D2. However, the axial surface 82S may not be perpendicular to the axial direction D2. As seen in FIG. 40, the bicycle rear hub assembly 12 includes a spacer 86, a support member 88, a sliding member 90, an additional biasing member 92, and a receiving member 94. However, it is possible to omit at least one of the spacer 86, the support member 88, the sliding member 90, the additional biasing member 92, and the storage member 94 from the bicycle rear hub assembly 12. As seen in FIGS. 44 and 45, the spacer 86 is at least partially disposed between at least one first tooth 36T and at least one protrusion 82T in a circumferential direction D1 defined around the rotation center axis A1. In this embodiment, the spacer 86 is partially provided between the first tooth 36T and the protrusion 82T in the circumferential direction D1. However, the spacer 86 may be completely disposed between the first tooth 36T and the protrusion 82T in the circumferential direction D1. As seen in FIGS. 45 to 47, the spacer 86 includes at least one intermediate portion 86A disposed between at least one first tooth 36T and at least one protrusion 82T. At least one intermediate portion 86A is provided between the at least one first tooth 36T and the at least one protrusion 82T in the circumferential direction D1. In this embodiment, the spacer 86 includes a plurality of intermediate portions 86A provided between the first tooth 36T and the protrusion 82T in the circumferential direction D1, respectively. Although the spacer 86 includes such intermediate portions 86A in this embodiment, the spacer 86 may include one intermediate portion 86A. As seen in FIGS. 46 and 47, the spacer 86 includes a connection portion 86B. A plurality of intermediate portions 86A extend from the connecting portion 86B in an axial direction D2 parallel to the rotation center axis A1. Although the spacer 86 includes the connection portion 86B in this embodiment, the connection portion 86B may be omitted from the spacer 86. The spacer 86 includes a non-metal material. In this embodiment, the non-metal material includes a resin material. Examples of the resin material include synthetic resin. Instead of or in addition to resin materials, non-metal materials may include materials other than resin materials. Although the middle portion 86A and the connection portion 86B are integrally provided with each other as a one-piece integral member in this embodiment, at least one of the middle portion 86A may be a portion separate from the connection portion 86B. As seen in FIGS. 44 and 45, a plurality of intermediate portions 86A are provided between the inner peripheral surface 36S of the hub body 36 and the outer peripheral surface 82P of the second ratchet member 82 in the radial direction. As seen in FIG. 44, the support member 88 is provided between the hub body 36 and the second ratchet member 82 in the axial direction D2. A support member 88 is attached to the second ratchet member 82. The support member 88 is disposed radially outward from the first ratchet member 80. The support member 88 may be in contact with the first ratchet member 80. The support member 88 preferably includes a non-metallic material. A support member 88 made of a non-metallic material reduces noise during operation of the bicycle rear hub assembly 12. In this embodiment, the non-metal material includes a resin material. Instead of or in addition to resin materials, non-metal materials may include materials other than resin materials. The sliding member 90 is disposed between the sprocket support body 28 and the second ratchet member 82 in an axial direction D2 parallel to the rotation center axis A1. The second ratchet member 82 is provided between the first ratchet member 80 and the sliding member 90 in the axial direction D2. The sliding member 90 preferably includes a non-metal material. The sliding member 90 made of a non-metallic material reduces noise during the operation of the bicycle rear hub assembly 12. In this embodiment, the non-metal material includes a resin material. Instead of or in addition to resin materials, non-metal materials may include materials other than resin materials. The sprocket support body 28 includes an abutment 28E to abut the second ratchet member 82 to restrict the axial movement of the second ratchet member 82 away from the hub body 36. The abutment 28E may indirectly abut the second ratchet member 82 via the sliding member 90 in this embodiment. Alternatively, the abutment 28E may directly abut the second ratchet member 82. The first ratchet member 80 is disposed on the axial side of the second ratchet member 82 opposite to the abutment 28E of the sprocket support body 28 in the axial direction D2. The sliding member 90 is provided between the abutment 28E of the sprocket support body 28 and the second ratchet member 82 in the axial direction D2. As seen in FIG. 44, the additional biasing member 92 is disposed between the hub body 36 and the second ratchet member 82 in the axial direction D2 to bias the second ratchet member 82 toward the sprocket support body 28. In this embodiment, the additional biasing member 92 biases the second ratchet member 82 in the axial direction D2 via the support member 88. The additional biasing member 92 is disposed radially outward from the biasing member 84. The additional biasing member 92 is disposed radially outward from the plurality of second ratchet teeth 82A in this embodiment. The storage member 94 includes a non-metal material. The receiving member 94 made of a non-metal material prevents the biasing member 84 from being excessively twisted during the operation of the bicycle rear hub assembly 12. In this embodiment, the non-metal material includes a resin material. Instead of or in addition to resin materials, non-metal materials may include materials other than resin materials. The storage member 94 includes an axial storage portion 96 and a radial storage portion 98. The axial storage portion 96 is provided between the first ratchet member 80 and the biasing member 84 in the axial direction D2. The radial storage portion 98 extends from the axial storage portion 96 in the axial direction D2. The radial receiving portion 98 is provided radially inward from the biasing member 84. The axial storage portion 96 and the radial storage portion 98 are provided integrally with each other as a one-piece integral member. However, the axial receiving portion 96 may be a separate member from the radial receiving portion 98. As seen in FIG. 44, the bicycle rear hub assembly 12 includes a sealing structure 100. The sealing structure 100 is provided between the sprocket support body 28 and the hub body 36. The hub body 36 includes an internal space 102. Each of the sprocket support body 28, the biasing member 84, the first ratchet member 80, and the second ratchet member 82 is disposed at least partially in the inner space 102 of the hub body 36. The internal space 102 is sealed by a sealing structure 100. In this embodiment, no lubricant is disposed in the internal space 102. However, the bicycle rear hub assembly 12 may include a lubricant disposed in the inner space 102. Compared with a situation where the bicycle rear hub assembly 12 may include a lubricant provided in the internal space 102, if no lubricant is provided, each gap between components disposed in the internal space 102 may be reduced. The operation of the bicycle rear hub assembly 12 will be described in detail below with reference to FIGS. 44, 48, and 49. As seen in FIG. 44, the axial direction D2 includes a first axial direction D21 and a second axial direction D22 opposite to the first axial direction D21. The biasing force F5 is applied from the biasing member 84 to the storage member 94 in the first axial direction D21. The biasing force F5 of the biasing member 84 biases the storage member 94, the first ratchet member 80, the second ratchet member 82, and the sliding member 90 toward the sprocket support body 28 in the first axial direction D21. This meshes the first ratchet tooth 80A with the second ratchet tooth 82A. In addition, as seen in FIG. 48, when the pedaling torque T1 is input to the sprocket support body 28 in the transmission rotation direction D11, the spiral internal spline teeth 80H1 are opposed by the spiral external spline teeth 46 in the first axial direction D21 The sprocket support body 28 is guided. This strongly meshes the first ratchet tooth 80A with the second ratchet tooth 82A. In this state, the pedaling torque T1 is transmitted from the sprocket support body 28 to the hub body 36 (FIG. 44) via the first ratchet member 80 and the second ratchet member 82 (FIG. 44). As seen in FIG. 48, during idle rotation, the first ratchet member 80 is brought into contact with the guide portion 28G by the rotational friction force F6 generated between the biasing member 84 (FIG. 44) and the first ratchet member 80. The two ratchet members 82 are disengaged. As seen in FIG. 49, the idle torque T2 is applied to the hub body 36 in the transmission rotation direction D11 during the idle rotation. The idle torque T2 is transmitted from the hub body 36 (FIG. 44) to the first ratchet member 80 via the second ratchet member 82 (FIG. 44). At this time, the spiral internal spline teeth 80H1 are guided by the spiral external spline teeth 46 with respect to the sprocket support body 28 in the second axial direction D22. This moves the first ratchet member 80 relative to the sprocket support body 28 against the biasing force F5 in the second axial direction D22. Therefore, the first ratchet member 80 moves away from the second ratchet member 82 in the second axial direction D22, so that the meshing between the first ratchet teeth 80A and the second ratchet teeth 82A is weak. This allows the second ratchet member 82 to rotate relative to the first ratchet member 80 in the transmission rotation direction D11, thereby preventing the idle torque T2 from being transmitted from the hub body 36 to the sprocket support body via the first ratchet member 80 and the second ratchet member 82 28. At this time, the first ratchet tooth 80A slides together with the second ratchet tooth 82A in the circumferential direction D1. Modifications As seen in FIG. 50, in the above embodiment and other modifications, the external spline teeth 40 may include a groove 40G provided in the circumferential direction D1 between the external spline driving surface 48 and the external spline non-driving surface 50. . The groove 40G reduces the weight of the rear hub assembly 12 of the bicycle. As seen in FIG. 51, in the above embodiment and other modifications, the internal spline teeth 64 may include a groove 64G provided in the circumferential direction D1 between the internal spline driving surface 66 and the internal spline non-driving surface 68. The groove 64G reduces the weight of the rear sprocket assembly 14 of the bicycle. In the present application, at least ten internal spline teeth can be provided indirectly to the second opening of the second sprocket, and in the above embodiment, at least ten internal spline teeth are directly provided to the second sprocket SP3 and SP4. A second opening for each of them. For example, instead of providing at least ten internal spline teeth directly to the second opening of the second sprocket SP3 and / or the second sprocket SP4, at least one of the second sprocket SP3 and SP4 may be attached To a sprocket support member including at least ten internal spline teeth. Alternatively, instead of directly providing at least ten internal spline teeth to the second opening of the second sprocket, at least one second sprocket may be integrally formed with at least one additional sprocket including at least ten internal spline teeth One-piece monolithic building block. Because this second sprocket indirectly includes at least ten internal spline teeth via a sprocket support member and / or additional sprocket, it also means that the second sprocket includes a chain configured to engage the bicycle rear hub assembly At least ten internal spline teeth engaged by the wheel support body. The bicycle rear sprocket assembly 14 may include only one first sprocket or more than two first sprocket wheels, and the bicycle rear sprocket assembly 14 includes two first sprocket wheels SP1 and SP2 in the above embodiment. The bicycle rear sprocket assembly 14 may include only one second sprocket or more than two second sprocket wheels, and the bicycle rear sprocket assembly 14 includes two second sprocket wheels SP3 and SP4 in the above embodiment. As seen in FIG. 52, in the sprocket support body 28, the total number of at least ten external spline teeth 40 may range from 22 to 24. For example, the total number of at least ten external spline teeth 40 may be 23. The first outer perimeter angle PA11 may range from 13 degrees to 17 degrees. For example, the first outer perimeter angle PA11 may be 15 degrees. The second outer perimeter angle PA12 may range from 28 degrees to 32 degrees. For example, the second outer perimeter angle PA12 may be 30 degrees. The first outer perimeter angle PA11 is a half of the second outer perimeter angle PA12. However, the first outer perimeter angle PA11 may be different from one and a half of the second outer perimeter angle PA12. The total number of at least ten external spline teeth 40 is not limited to the above modifications and scope. The first external perimeter angle PA11 is not limited to the above modifications and ranges. The second external perimeter angle PA12 is not limited to the above modifications and ranges. As seen in FIG. 53, in the sprocket support body 28, the sum of the radial lengths RL11 of the plurality of external spline drive surfaces 48 may range from 11 mm to 14 mm. The sum of the radial lengths RL11 of the plurality of external spline drive surfaces 48 may be 12. 5 mm. The sum of the additional radial lengths RL12 can range from 26 mm to 30 mm. For example, the sum of the additional radial length RL12 may be 28. 2 mm. However, the sum of the additional radial lengths RL12 is not limited to the above modifications and ranges. As seen in FIG. 54, in the first torque transmitting structure SP1T of the first sprocket SP1, the total number of at least ten first torque transmitting teeth SP1T1 may range from 22 to 24. For example, the total number of at least ten first torque transmitting teeth SP1T1 may be 23. However, the total number of at least ten first torque transmitting teeth SP1T1 is not limited to the above modifications and ranges. As seen in FIG. 55, in the second torque transmitting structure SP2T of the first sprocket SP2, the total number of at least ten second torque transmitting teeth SP2T1 may range from 22 to 24. For example, the total number of at least ten second torque transmitting teeth SP2T1 may be 23. However, the total number of at least ten second torque transmitting teeth SP2T1 is not limited to the above modifications and ranges. As seen in FIG. 56, in the first sprocket SP2, the total number of at least ten internal spline teeth 63 of the first sprocket SP2 may range from 22 to 24. For example, the total number of the at least ten internal spline teeth 63 of the first sprocket SP2 may be 23. However, the total number of at least ten internal spline teeth 63 is not limited to the above modifications and scope. As seen in FIG. 57, in the second sprocket SP3, the total number of at least ten internal spline teeth 64 of the second sprocket SP3 may range from 22 to 24. For example, the total number of at least ten internal spline teeth 64 of the second sprocket SP3 may be 23. However, the total number of at least ten internal spline teeth 64 is not limited to the above modifications and scope. As seen in FIG. 58, in the second sprocket SP4, the total number of at least ten internal spline teeth 65 of the second sprocket SP4 may range from 22 to 24. For example, the total number of the at least ten internal spline teeth 65 of the second sprocket SP4 may be 23. However, the total number of at least ten internal spline teeth 65 is not limited to the above modifications and scope. As seen in FIG. 59, among the at least ten internal spline teeth 64 of the second sprocket SP3, the first internal peripheral angle PA21 may range from 13 degrees to 17 degrees. For example, the first internal perimeter angle PA21 may be 15 degrees. The second internal perimeter angle PA22 may range from 28 degrees to 32 degrees. For example, the second internal perimeter angle PA22 may be 30 degrees. The first internal perimeter angle PA21 may be a half of the second internal perimeter angle PA22. However, the first internal perimeter angle PA21 may be different from one and a half of the second internal perimeter angle PA22. The first internal perimeter angle PA21 is not limited to the above modifications and scope. The second internal perimeter angle PA22 is not limited to the above modifications and ranges. As seen in FIG. 60, in the internal spline teeth 64 of the second sprocket SP3, the sum of the radial lengths RL21 of the plurality of internal spline transmission surfaces 66 may range from 11 mm to 14 mm. For example, the sum of the radial length RL21 of the plurality of internal spline drive surfaces 66 may be 12. 5 mm. However, the total length of the RL21 radial length is not limited to the above modifications and scope. The sum of the additional radial lengths RL22 can range from 26 mm to 29 mm. For example, the sum of the extra radial length RL22 is 27. 6 mm. However, the sum of the additional radial lengths RL22 is not limited to this embodiment and the above range. The internal spline teeth 63 of the first sprocket SP2 and the internal spline teeth 65 of the second sprocket SP4 have the same structure as the internal spline teeth 64 of the second sprocket SP3. As seen in FIG. 61, the internal spline teeth 76 of the sprocket support member 37 may have the same structure as the internal spline teeth 64 of the second sprocket SP3 illustrated in FIGS. 57, 59 and 60. The total number of at least ten internal spline teeth 76 of the sprocket support member 37 may range from 22 to 24. For example, the total number of at least ten internal spline teeth 76 of the sprocket support member 37 may be 23. However, the total number of at least ten internal spline teeth 76 is not limited to the above modifications and scope. The structure of the internal spline teeth 64 illustrated in FIG. 60 can be applied to the internal spline teeth 76 of the sprocket support member 37. As seen in FIG. 62, the bicycle rear sprocket assembly 14 may include an additional sprocket SP13. The additional sprocket SP13 is coupled to the additional sprocket SP12 through a plurality of coupling members SP13R. The additional sprocket SP13 includes a sprocket body SP13A and at least one sprocket tooth SP13B. The sprocket body SP13A of the additional sprocket SP13 is coupled to the sprocket body SP12A of the additional sprocket SP12 through a plurality of coupling members SP13R. At least one sprocket tooth SP13B extends radially outward from the sprocket body SP13A. The total number of at least one sprocket tooth SP13B is greater than the total number of at least one sprocket tooth SP12B. Preferably, the total number of teeth of at least one sprocket tooth SP13B is equal to or greater than 46. More preferably, the total number of teeth of at least one sprocket tooth SP13B is equal to or greater than 50. For example, the total number of teeth of at least one sprocket tooth SP13B is 54. The tooth profile of the sprocket teeth SP1B to SP13B of the sprocket SP1 to SP13 may have a conventional tooth profile and / or a narrow and wide tooth profile. In particular, as the narrow-wide tooth profile, the sprocket teeth SP1B to SP13B of the sprocket SP1 to SP13 may also include at least one first tooth and at least one second tooth. Chain engagement width, the second teeth each have a second axial maximum chain engagement width that is smaller than the first axial maximum chain engagement width. Measure the maximum chain meshing width in the first axial direction and the maximum mesh meshing width in the second axial direction along the axial direction D2. The first axial maximum chain meshing width is larger than the axial inner chain space defined by one pair of inner chain plates of the bicycle chain 20 and smaller than the axial outer chain space defined by one of the bicycle chain 20's outer chain plates. When engaging with one of the sprockets SP1 to SP13, the outer link plates face each other in the axial direction D2. The second axial maximum chain meshing width is smaller than the axial inner chain space defined by the pair of inner chain plates of the bicycle chain 20. Therefore, at least one of the first teeth is configured to mesh with one of the outer chain plates of the bicycle chain 20, wherein the outer chain plate faces in the axial direction D2 when the bicycle chain 20 meshes with one of the sprockets SP1 to SP13. Each other, and at least one second tooth is configured to mesh with one pair of inner link plates of the bicycle chain 20, wherein the pair of inner link plates face each other in the axial direction D2. Preferably, at least one first tooth and at least one second tooth are alternately disposed on an outer periphery of at least one of the sprockets SP1 to SP13. Preferably, the sprocket teeth SP1B to SP13B of the sprocket SP1 to SP13 include a plurality of first teeth and a plurality of second teeth, each of which has a first axial maximum chain meshing width as mentioned above. Each of these second teeth has the second axial maximum chain meshing width mentioned above. Preferably, the plurality of first teeth and the plurality of second teeth are alternately disposed on an outer periphery of at least one of the sprockets SP1 to SP13. Preferably, the sprocket teeth of the largest sprocket can have this narrow and wide tooth profile. Therefore, preferably, the sprocket teeth SP12B of the sprocket SP12 in FIG. 6 or the sprocket teeth SP13B of the sprocket SP13 in FIG. 62 includes at least one having the first axial maximum chain meshing width mentioned above. The first tooth and at least one second tooth having the second axial maximum chain meshing width mentioned above. The term "comprising" and its derivatives as used herein are intended to specify the presence of stated features, elements, components, groups, integers, and / or steps but do not exclude other unstated features, elements, components, groups, integers, and Open term for the presence of steps. This concept also applies to words of similar meaning, such as the terms "having", "including" and their derivatives. The terms "component", "section", "section", "component", "component", "body" and "structure" when used in the singular can have the dual meaning of a single component or a plurality of components. The ordinal numbers such as "first" and "second" described in this application are merely identifiers and have no other meaning, such as a specific order and so on. Further, for example, the term "first element" itself does not imply the existence of a "second element", and the term "second element" itself does not imply the existence of a "first element". The term "pair" as used herein may encompass configurations in which the paired elements have different shapes or structures from each other, except for configurations in which the paired elements have the same shape or structure as each other. Thus, the terms "a", "one or more" and "at least one" are used interchangeably herein. Finally, terms of degree such as "substantially", "approximately" and "approximately" as used herein mean a reasonable amount of deviation of the modified term such that the end result has not changed significantly. All numerical values described in this application can be understood to include terms such as "substantially", "approximately" and "approximately". Obviously, many modifications and variations of the present invention are possible based on the above teachings. It should therefore be understood that the invention may be practiced in other ways than that specifically described herein within the scope of the appended patent applications.

10‧‧‧自行車傳動系統10‧‧‧ Bicycle Transmission System

12‧‧‧自行車後輪轂總成12‧‧‧ Bicycle rear wheel assembly

14‧‧‧自行車後鏈輪總成14‧‧‧ Bicycle rear sprocket assembly

16‧‧‧自行車制動轉子16‧‧‧ Bicycle brake rotor

18‧‧‧曲柄總成18‧‧‧ crank assembly

20‧‧‧自行車鏈20‧‧‧ Bicycle chain

22‧‧‧曲柄軸22‧‧‧ crank shaft

24‧‧‧右曲柄臂24‧‧‧Right crank arm

26‧‧‧左曲柄臂26‧‧‧Left crank arm

27‧‧‧前鏈輪27‧‧‧ front sprocket

28‧‧‧鏈輪支撐主體28‧‧‧Sprocket support body

28A‧‧‧內螺紋部分28A‧‧‧Internal thread part

28B‧‧‧第一軸向端28B‧‧‧First axial end

28C‧‧‧第二軸向端28C‧‧‧Second axial end

28D‧‧‧軸向鏈輪鄰接表面28D‧‧‧Axial sprocket abutting surface

28E‧‧‧鄰接件28E‧‧‧Adjacent

28G‧‧‧導引部分28G‧‧‧Guide

28H‧‧‧第一螺旋花鍵28H‧‧‧First Spline Spline

28I‧‧‧輪轂指示器28I‧‧‧ Wheel Indicator

28P‧‧‧外部周邊表面28P‧‧‧outer peripheral surface

30‧‧‧輪轂軸30‧‧‧ hub axle

30A‧‧‧軸通孔30A‧‧‧Shaft Through Hole

30B‧‧‧第一軸端30B‧‧‧First shaft end

30B1‧‧‧第一軸向框架鄰接表面30B1‧‧‧ abutment surface of first axial frame

30C1‧‧‧第二軸向框架鄰接表面30C1‧‧‧Second axial frame abutting surface

30C‧‧‧第二軸端30C‧‧‧Second shaft end

30X‧‧‧軸管30X‧‧‧Shaft

30Y‧‧‧第一軸部分30Y‧‧‧First axis part

30Z‧‧‧第二軸部分30Z‧‧‧Second axis section

32‧‧‧鎖定構件32‧‧‧ lock member

32A‧‧‧管狀主體32A‧‧‧ Tubular body

32A1‧‧‧內部周邊表面32A1‧‧‧ Internal peripheral surface

32B‧‧‧外螺紋部分32B‧‧‧External thread part

32C‧‧‧徑向突出物32C‧‧‧Radial protrusion

32D‧‧‧第一軸向端32D‧‧‧first axial end

32E‧‧‧第二軸向端32E‧‧‧Second axial end

32F‧‧‧工具嚙合部分32F‧‧‧Tool meshing part

32G‧‧‧嚙合凹槽32G‧‧‧Matching groove

34‧‧‧制動轉子支撐主體34‧‧‧brake rotor support body

36‧‧‧輪轂主體36‧‧‧Wheel body

36A‧‧‧第一輪輻安裝部分36A‧‧‧First spoke installation part

36A1‧‧‧第一附接孔36A1‧‧‧First attachment hole

36B‧‧‧第二輪輻安裝部分36B‧‧‧Second spoke installation part

36B1‧‧‧第二附接孔36B1‧‧‧Second attachment hole

36C‧‧‧第一軸向最外部分36C‧‧‧ the outermost part of the first axis

36D‧‧‧第二軸向最外部分36D‧‧‧ second axial outermost part

36F‧‧‧連接孔36F‧‧‧Connecting hole

36H‧‧‧自由輪外殼36H‧‧‧Free Wheel Housing

36R‧‧‧凹槽36R‧‧‧Groove

36S‧‧‧內部周邊表面36S‧‧‧Inner peripheral surface

36T‧‧‧第一齒36T‧‧‧First tooth

37‧‧‧鏈輪支撐構件37‧‧‧Sprocket support member

37A‧‧‧黏附劑37A‧‧‧Adhesive

38‧‧‧間隔件38‧‧‧ spacer

38A‧‧‧第一間隔件38A‧‧‧First spacer

38B‧‧‧第二間隔件38B‧‧‧Second spacer

38C‧‧‧第三間隔件38C‧‧‧Third spacer

38D‧‧‧第四間隔件38D‧‧‧Fourth spacer

38E‧‧‧第五間隔件38E‧‧‧Fifth spacer

38F‧‧‧第六間隔件38F‧‧‧ Sixth spacer

38G‧‧‧第七間隔件38G‧‧‧Seventh spacer

39A‧‧‧第一環39A‧‧‧First Ring

39B‧‧‧第二環39B‧‧‧Second Ring

40‧‧‧外部花鍵齒40‧‧‧ external spline teeth

40A‧‧‧徑向最外端40A‧‧‧ Radial outermost

40G‧‧‧凹槽40G‧‧‧groove

40X‧‧‧外部花鍵齒40X‧‧‧External Spline Teeth

41‧‧‧基座支撐件41‧‧‧ base support

42‧‧‧較大直徑部分42‧‧‧large diameter part

42A‧‧‧軸向端42A‧‧‧ axial end

44‧‧‧凸緣44‧‧‧ flange

46‧‧‧螺旋外部花鍵齒46‧‧‧ Spiral external spline teeth

48‧‧‧外部花鍵傳動表面48‧‧‧ external spline drive surface

48A‧‧‧徑向最外邊緣48A‧‧‧Radial outermost edge

48B‧‧‧徑向最內邊緣48B‧‧‧ Radial innermost edge

50‧‧‧外部花鍵非傳動表面50‧‧‧ external spline non-drive surface

50A‧‧‧徑向最外邊緣50A‧‧‧Radial outermost edge

50B‧‧‧徑向最內邊緣50B‧‧‧ Radial innermost edge

50R‧‧‧參考點50R‧‧‧Reference point

52‧‧‧額外外部花鍵齒52‧‧‧ Extra external spline teeth

54‧‧‧額外基座支撐件54‧‧‧ Extra base support

60‧‧‧輪轂嚙合部分60‧‧‧Wheel meshing part

62‧‧‧支撐臂62‧‧‧ support arm

62A‧‧‧第一附接部分62A‧‧‧First Attachment

62B‧‧‧第二附接部分62B‧‧‧Second Attachment

62C‧‧‧第三附接部分62C‧‧‧ Third Attachment

62D‧‧‧第四附接部分62D‧‧‧Fourth Attachment

62E‧‧‧第五附接部分62E‧‧‧Fifth Attachment

62F‧‧‧第六附接部分62F‧‧‧ Sixth Attachment

62G‧‧‧第七附接部分62G‧‧‧Seventh Attachment

62H‧‧‧第八附接部分62H‧‧‧Eighth Attachment

63‧‧‧第一扭矩傳遞齒63‧‧‧First torque transmission tooth

64‧‧‧內部花鍵齒64‧‧‧ Internal spline teeth

64A‧‧‧徑向最內端64A‧‧‧ Radial innermost

64G‧‧‧凹槽64G‧‧‧groove

65‧‧‧內部花鍵齒65‧‧‧ Internal spline teeth

66‧‧‧內部花鍵傳動表面66‧‧‧ Internal spline drive surface

66A‧‧‧徑向最外邊緣66A‧‧‧Radial outermost edge

66B‧‧‧徑向最內邊緣66B‧‧‧ Radial innermost edge

68‧‧‧內部花鍵非傳動表面68‧‧‧ Internal spline non-drive surface

68A‧‧‧徑向最外邊緣68A‧‧‧Radial outermost edge

68B‧‧‧徑向最內邊緣68B‧‧‧ Radial innermost edge

68R‧‧‧參考點68R‧‧‧Reference point

76‧‧‧內部花鍵齒76‧‧‧ Internal spline teeth

78‧‧‧自由輪結構78‧‧‧ free wheel structure

79A‧‧‧第一軸承79A‧‧‧First bearing

79B‧‧‧第二軸承79B‧‧‧Second bearing

80‧‧‧第一棘輪構件80‧‧‧The first ratchet member

80A‧‧‧第一棘輪齒80A‧‧‧The first ratchet tooth

80H‧‧‧第二螺旋花鍵80H‧‧‧Second Spiral Spline

80H1‧‧‧螺旋內部花鍵齒80H1‧‧‧spiral internal spline teeth

80S‧‧‧軸向表面80S‧‧‧Axial surface

82‧‧‧第二棘輪構件82‧‧‧Second ratchet member

82A‧‧‧第二棘輪齒82A‧‧‧Second ratchet tooth

82E‧‧‧輪轂主體嚙合部分82E‧‧‧Wheel body engaging part

82P‧‧‧外部周邊表面82P‧‧‧External peripheral surface

82S‧‧‧軸向表面82S‧‧‧Axial surface

82T‧‧‧突出物82T‧‧‧ protrusion

84‧‧‧偏置構件84‧‧‧offset member

84A‧‧‧捲曲主體84A‧‧‧ Curled body

84B‧‧‧連接端84B‧‧‧Connector

86‧‧‧間隔件86‧‧‧ spacer

86A‧‧‧中間部分86A‧‧‧ middle section

86B‧‧‧連接部分86B‧‧‧Connection section

88‧‧‧支撐構件88‧‧‧ support member

90‧‧‧滑動構件90‧‧‧ sliding member

92‧‧‧額外偏置構件92‧‧‧ Extra Offset

94‧‧‧收納構件94‧‧‧Storage components

96‧‧‧軸向收納部分96‧‧‧Axial storage section

98‧‧‧徑向收納部分98‧‧‧Radial storage section

100‧‧‧密封結構100‧‧‧sealed structure

102‧‧‧內部空間102‧‧‧Interior space

A1‧‧‧中心軸線A1‧‧‧center axis

AG11‧‧‧第一外部花鍵表面角AG11‧‧‧First external spline surface angle

AG12‧‧‧第二外部花鍵表面角AG12‧‧‧Second external spline surface angle

AG21‧‧‧第一內部花鍵表面角AG21‧‧‧First spline surface angle

AG22‧‧‧第二內部花鍵表面角AG22‧‧‧Second internal spline surface angle

AG28‧‧‧鈍角AG28‧‧‧ obtuse angle

AL1‧‧‧第一軸向長度AL1‧‧‧First axial length

AL2‧‧‧第二軸向長度AL2‧‧‧Second axial length

AL3‧‧‧鏈輪配置軸向長度AL3‧‧‧ sprocket configuration axial length

AL4‧‧‧額外軸向長度AL4‧‧‧Extra axial length

AL5‧‧‧較大直徑軸向長度AL5‧‧‧larger diameter axial length

BD1‧‧‧最小內徑BD1‧‧‧minimum inner diameter

BD2‧‧‧最大外徑BD2‧‧‧ Maximum outer diameter

BD3‧‧‧最小外徑BD3‧‧‧Minimal outer diameter

BF‧‧‧自行車框架BF‧‧‧Bicycle frame

BF1‧‧‧第一框架BF1‧‧‧First Frame

BF2‧‧‧第二框架BF2‧‧‧Second Framework

BF11‧‧‧第一凹槽BF11‧‧‧First groove

BF12‧‧‧第一部分BF12‧‧‧Part I

BF21‧‧‧第二凹槽BF21‧‧‧Second groove

BF22‧‧‧第二部分BF22‧‧‧Part Two

CL1‧‧‧參考線CL1‧‧‧Reference line

CL2‧‧‧參考線CL2‧‧‧Reference Line

CP1‧‧‧圓周中心點CP1‧‧‧circle center point

CP2‧‧‧圓周中心點CP2‧‧‧circle center point

CPL‧‧‧軸向中心平面CPL‧‧‧ axial center plane

D1‧‧‧圓周方向D1‧‧‧ circumferential direction

D11‧‧‧傳動旋轉方向D11‧‧‧Drive rotation direction

D12‧‧‧反向旋轉方向D12‧‧‧Reverse rotation direction

D2‧‧‧軸向方向D2‧‧‧ axial direction

D21‧‧‧第一軸向方向D21‧‧‧First axial direction

D22‧‧‧第二軸向方向D22‧‧‧Second axial direction

DM11‧‧‧外部花鍵頂徑DM11‧‧‧External spline top diameter

DM12‧‧‧外部花鍵底徑DM12‧‧‧Bottom diameter of external spline

DM13‧‧‧外徑DM13‧‧‧ Outside diameter

DM14‧‧‧額外外部花鍵頂徑DM14‧‧‧ Extra external spline top diameter

DM21‧‧‧內部花鍵底徑DM21‧‧‧ Internal Spline Bottom Diameter

DM22‧‧‧內部花鍵頂徑DM22‧‧‧Internal spline top diameter

ED1‧‧‧第一外徑ED1‧‧‧first outer diameter

ED2‧‧‧第二外徑ED2‧‧‧Second outer diameter

ED3‧‧‧軸向寬度ED3‧‧‧Axial width

ED4‧‧‧軸向長度ED4‧‧‧Axial length

F1‧‧‧傳動旋轉力F1‧‧‧Drive rotation force

F2‧‧‧推力F2‧‧‧thrust

F3‧‧‧推力F3‧‧‧thrust

F5‧‧‧偏置力F5‧‧‧ biasing force

F6‧‧‧旋轉摩擦力F6‧‧‧rotating friction

III-III‧‧‧線III-III‧‧‧line

L11‧‧‧第一徑向線L11‧‧‧The first radial line

L12‧‧‧第二徑向線L12‧‧‧Second radial line

L21‧‧‧第一徑向線L21‧‧‧First radial line

L22‧‧‧第二徑向線L22‧‧‧ Second radial line

MD1‧‧‧第一最小直徑MD1‧‧‧first minimum diameter

MD2‧‧‧第一最小直徑MD2‧‧‧first minimum diameter

MD3‧‧‧第二最小直徑MD3‧‧‧Second smallest diameter

MD4‧‧‧第二最小直徑MD4‧‧‧Second smallest diameter

MD28‧‧‧最小外徑MD28‧‧‧Minimal outer diameter

MW1‧‧‧圓周最大寬度MW1‧‧‧Circumference maximum width

MW2‧‧‧圓周最大寬度MW2‧‧‧Circumference maximum width

PA11‧‧‧第一外部周節角PA11‧‧‧First external week angle

PA12‧‧‧第二外部周節角PA12‧‧‧Second Outer Corner

PA21‧‧‧第一內部周節角PA21‧‧‧First internal week angle

PA22‧‧‧第二內部周節角PA22‧‧‧Second Internal Week Angle

PC1‧‧‧節圓PC1‧‧‧ Festival

PC2‧‧‧節圓PC2‧‧‧ Festival

PC3‧‧‧節圓PC3‧‧‧ Festival

PC4‧‧‧節圓PC4‧‧‧ Festival Circle

PC5‧‧‧節圓PC5‧‧‧ Festival

PC6‧‧‧節圓PC6‧‧‧ Festival

PC7‧‧‧節圓PC7‧‧‧ Festival

PC8‧‧‧節圓PC8‧‧‧ Festival

PC9‧‧‧節圓PC9‧‧‧ Festival Circle

PC10‧‧‧節圓PC10‧‧‧ Festival

PC11‧‧‧節圓PC11‧‧‧ Festival

PC12‧‧‧節圓PC12‧‧‧ Festival Circle

PCD1‧‧‧節圓直徑PCD1‧‧‧ pitch circle diameter

PCD2‧‧‧節圓直徑PCD2‧‧‧ pitch circle diameter

PCD3‧‧‧節圓直徑PCD3‧‧‧ pitch circle diameter

PCD4‧‧‧節圓直徑PCD4‧‧‧ pitch diameter

PCD5‧‧‧節圓直徑PCD5‧‧‧ pitch circle diameter

PCD6‧‧‧節圓直徑PCD6‧‧‧ pitch diameter

PCD7‧‧‧節圓直徑PCD7‧‧‧ pitch circle diameter

PCD8‧‧‧節圓直徑PCD8‧‧‧ pitch circle diameter

PCD9‧‧‧節圓直徑PCD9‧‧‧ pitch circle diameter

PCD10‧‧‧節圓直徑PCD10‧‧‧ pitch circle diameter

PCD11‧‧‧節圓直徑PCD11‧‧‧ pitch circle diameter

PCD12‧‧‧節圓直徑PCD12‧‧‧ pitch circle diameter

RC11‧‧‧第一參考圓RC11‧‧‧First reference circle

RC12‧‧‧外部花鍵齒根圓RC12‧‧‧External spline tooth root circle

RC21‧‧‧第二參考圓RC21‧‧‧Second Reference Circle

RC22‧‧‧內部花鍵齒根圓RC22‧‧‧Internal spline tooth root circle

RL11‧‧‧徑向長度RL11‧‧‧Radial length

RL12‧‧‧額外徑向長度RL12‧‧‧Extra radial length

RL21‧‧‧徑向長度RL21‧‧‧Radial length

RL22‧‧‧額外徑向長度RL22‧‧‧Extra radial length

SK1‧‧‧第一輪輻SK1‧‧‧First spoke

SK2‧‧‧第二輪輻SK2‧‧‧ second spoke

SL1‧‧‧軸向花鍵齒長度SL1‧‧‧Axial spline tooth length

SP1‧‧‧第一鏈輪SP1‧‧‧First Sprocket

SP1A‧‧‧鏈輪主體SP1A‧‧‧Sprocket body

SP1B‧‧‧鏈輪齒SP1B‧‧‧Sprocket teeth

SP1G‧‧‧第一向內側SP1G‧‧‧First inward

SP1H‧‧‧第一向外側SP1H‧‧‧First outward

SP1I‧‧‧鏈輪指示器SP1I‧‧‧Sprocket indicator

SP1K‧‧‧第一開口SP1K‧‧‧First opening

SP1T‧‧‧第一扭矩傳遞結構SP1T‧‧‧First torque transmission structure

SP1T1‧‧‧第一扭矩傳遞齒SP1T1‧‧‧First torque transmission tooth

SP2‧‧‧第一鏈輪SP2‧‧‧First Sprocket

SP2A‧‧‧鏈輪主體SP2A‧‧‧Sprocket body

SP2B‧‧‧鏈輪齒SP2B‧‧‧Sprocket Teeth

SP2F1‧‧‧第一移位促進區域SP2F1‧‧‧‧First shift promotion area

SP2F2‧‧‧第二移位促進區域SP2F2‧‧‧Second shift promotion area

SP2G‧‧‧第一向外側SP2G‧‧‧First outward

SP2H‧‧‧第一向內側SP2H‧‧‧First inward

SP2K‧‧‧第一開口SP2K‧‧‧First opening

SP2M‧‧‧第一扭矩傳遞結構SP2M‧‧‧First torque transmission structure

SP2R1‧‧‧第一移位促進凹槽SP2R1‧‧‧‧First shift promotion groove

SP2R2‧‧‧第二移位促進凹槽SP2R2‧‧‧Second shift promotion groove

SP2T‧‧‧第二扭矩傳遞結構SP2T‧‧‧Second torque transmission structure

SP2T1‧‧‧第二扭矩傳遞齒SP2T1‧‧‧Second torque transmission tooth

SP3‧‧‧第二鏈輪SP3‧‧‧Second Sprocket

SP3A‧‧‧鏈輪主體SP3A‧‧‧Sprocket body

SP3B‧‧‧鏈輪齒SP3B‧‧‧Sprocket Teeth

SP3F1‧‧‧第一移位促進區域SP3F1‧‧‧‧First shift promotion area

SP3F2‧‧‧第二移位促進區域SP3F2‧‧‧Second shift promotion area

SP3K‧‧‧第二開口SP3K‧‧‧Second Opening

SP3R1‧‧‧第一移位促進凹槽SP3R1‧‧‧First shift promotion groove

SP3R2‧‧‧第二移位促進凹槽SP3R2‧‧‧Second shift promotion groove

SP4‧‧‧第二鏈輪SP4‧‧‧Second Sprocket

SP4A‧‧‧鏈輪主體SP4A‧‧‧Sprocket body

SP4B‧‧‧鏈輪齒SP4B‧‧‧Sprocket teeth

SP4F1‧‧‧第一移位促進區域SP4F1‧‧‧‧First shift promotion area

SP4F2‧‧‧第二移位促進區域SP4F2‧‧‧Second shift promotion area

SP4K‧‧‧第二開口SP4K‧‧‧Second Opening

SP4R1‧‧‧第一移位促進凹槽SP4R1‧‧‧First shift promotion groove

SP4R2‧‧‧第二移位促進凹槽SP4R2‧‧‧Second shift promotion groove

SP5‧‧‧額外鏈輪SP5‧‧‧Extra Sprocket

SP5A‧‧‧鏈輪主體SP5A‧‧‧Sprocket body

SP5B‧‧‧鏈輪齒SP5B‧‧‧Sprocket Teeth

SP5F1‧‧‧第一移位促進區域SP5F1‧‧‧‧First shift promotion area

SP5F2‧‧‧第二移位促進區域SP5F2‧‧‧Second shift promotion area

SP5R1‧‧‧第一移位促進凹槽SP5R1‧‧‧‧First shift promotion groove

SP5R2‧‧‧第二移位促進凹槽SP5R2‧‧‧Second shift promotion groove

SP6‧‧‧額外鏈輪SP6‧‧‧Extra Sprocket

SP6A‧‧‧鏈輪主體SP6A‧‧‧Sprocket body

SP6B‧‧‧鏈輪齒SP6B‧‧‧Sprocket teeth

SP6F1‧‧‧第一移位促進區域SP6F1‧‧‧‧First shift promotion area

SP6F2‧‧‧第二移位促進區域SP6F2‧‧‧Second shift promotion area

SP6R1‧‧‧第一移位促進凹槽SP6R1‧‧‧First shift promotion groove

SP6R2‧‧‧第二移位促進凹槽SP6R2‧‧‧Second shift promotion groove

SP7‧‧‧額外鏈輪SP7‧‧‧Extra Sprocket

SP7A‧‧‧鏈輪主體SP7A‧‧‧Sprocket body

SP7B‧‧‧鏈輪齒SP7B‧‧‧Sprocket teeth

SP7F1‧‧‧第一移位促進區域SP7F1‧‧‧‧First shift promotion area

SP7F2‧‧‧第二移位促進區域SP7F2‧‧‧Second shift promotion area

SP7R1‧‧‧第一移位促進凹槽SP7R1‧‧‧First shift promotion groove

SP7R2‧‧‧第二移位促進凹槽SP7R2‧‧‧Second shift promotion groove

SP8‧‧‧額外鏈輪SP8‧‧‧Extra Sprocket

SP8A‧‧‧鏈輪主體SP8A‧‧‧Sprocket body

SP8B‧‧‧鏈輪齒SP8B‧‧‧Sprocket teeth

SP8F1‧‧‧第一移位促進區域SP8F1‧‧‧‧First shift promotion area

SP8F2‧‧‧第二移位促進區域SP8F2‧‧‧Second shift promotion area

SP8R1‧‧‧第一移位促進凹槽SP8R1‧‧‧First shift promotion groove

SP8R2‧‧‧第二移位促進凹槽SP8R2‧‧‧Second shift promotion groove

SP9‧‧‧額外鏈輪SP9‧‧‧Extra Sprocket

SP9A‧‧‧鏈輪主體SP9A‧‧‧Sprocket body

SP9B‧‧‧鏈輪齒SP9B‧‧‧Sprocket teeth

SP9F1‧‧‧第一移位促進區域SP9F1‧‧‧‧First shift promotion area

SP9F2‧‧‧第二移位促進區域SP9F2‧‧‧Second shift promotion area

SP9R1‧‧‧第一移位促進凹槽SP9R1‧‧‧First shift promotion groove

SP9R2‧‧‧第二移位促進凹槽SP9R2‧‧‧Second shift promotion groove

SP10‧‧‧額外鏈輪SP10‧‧‧Extra Sprocket

SP10A‧‧‧鏈輪主體SP10A‧‧‧Sprocket body

SP10B‧‧‧鏈輪齒SP10B‧‧‧Sprocket teeth

SP10F1‧‧‧第一移位促進區域SP10F1‧‧‧‧First shift promotion area

SP10F2‧‧‧第二移位促進區域SP10F2‧‧‧Second shift promotion area

SP10R1‧‧‧第一移位促進凹槽SP10R1‧‧‧First shift promotion groove

SP10R2‧‧‧第二移位促進凹槽SP10R2‧‧‧Second shift promotion groove

SP11‧‧‧額外鏈輪SP11‧‧‧Extra Sprocket

SP11A‧‧‧鏈輪主體SP11A‧‧‧Sprocket body

SP11B‧‧‧鏈輪齒SP11B‧‧‧Sprocket teeth

SP11F1‧‧‧第一移位促進區域SP11F1‧‧‧‧First shift promotion area

SP11F2‧‧‧第二移位促進區域SP11F2‧‧‧Second shift promotion area

SP11R1‧‧‧第一移位促進凹槽SP11R1‧‧‧‧First shift promotion groove

SP11R2‧‧‧第二移位促進凹槽SP11R2‧‧‧Second shift promotion groove

SP12‧‧‧額外鏈輪SP12‧‧‧Extra Sprocket

SP12A‧‧‧鏈輪主體SP12A‧‧‧Sprocket body

SP12B‧‧‧鏈輪齒SP12B‧‧‧Sprocket teeth

SP12F1‧‧‧第一移位促進區域SP12F1‧‧‧First shift promotion area

SP12F2‧‧‧第二移位促進區域SP12F2‧‧‧Second shift promotion area

SP12R1‧‧‧第一移位促進凹槽SP12R1‧‧‧First shift promotion groove

SP12R2‧‧‧第二移位促進凹槽SP12R2‧‧‧Second shift promotion groove

SP13‧‧‧額外鏈輪SP13‧‧‧Extra Sprocket

SP13A‧‧‧鏈輪主體SP13A‧‧‧Sprocket body

SP13B‧‧‧鏈輪齒SP13B‧‧‧Sprocket teeth

SP13R‧‧‧耦接構件SP13R‧‧‧Coupling member

T1‧‧‧踩踏扭矩T1‧‧‧Stepping torque

T2‧‧‧惰轉扭矩T2‧‧‧ idle torque

TD12‧‧‧最大齒尖直徑TD12‧‧‧Maximum Tooth Tip Diameter

WS‧‧‧車輪緊固結構WS‧‧‧Wheel fastening structure

WS1‧‧‧緊固桿WS1‧‧‧Fastening lever

XLV-XLV‧‧‧線XLV-XLV‧‧‧line

當結合附圖考慮時，參考以下實施方式，本發明之更完整評價及其許多伴隨優點將易於獲得，同樣變為更好理解。 圖1為根據一實施例之自行車傳動系統的示意圖。 圖2為圖1中所說明之自行車傳動系統的分解透視圖。 圖3為沿圖2之線III-III截取之自行車傳動系統的橫截面圖。 圖4為圖2中所說明之自行車傳動系統之自行車後輪轂總成的透視圖，該自行車後輪轂總成具有自行車後鏈輪總成之鎖定構件。 圖5為圖1中所說明之自行車傳動系統之自行車後鏈輪總成的側視圖。 圖6為圖4中所說明之自行車傳動系統的放大橫截面圖。 圖7為圖5中所說明之自行車後鏈輪總成之鏈輪的側視圖。 圖8為圖5中所說明的自行車後鏈輪總成之鏈輪的側視圖。 圖9為圖5中所說明之自行車後鏈輪總成之鏈輪的側視圖。 圖10為圖5中所說明的自行車後鏈輪總成之第一鏈輪的側視圖。 圖11為圖5中所說明之自行車後鏈輪總成之鏈輪的側視圖。 圖12為圖5中所說明之自行車後鏈輪總成之鏈輪的側視圖。 圖13為圖5中所說明之自行車後鏈輪總成之鏈輪的側視圖。 圖14為圖5中所說明之自行車後鏈輪總成之鏈輪的側視圖。 圖15為圖5中所說明之自行車後鏈輪總成之鏈輪的側視圖。 圖16為圖5中所說明之自行車後鏈輪總成之鏈輪的側視圖。 圖17為圖5中所說明之自行車後鏈輪總成之鏈輪的側視圖。 圖18為圖5中所說明之自行車後鏈輪總成之鏈輪的側視圖。 圖19為圖5中所說明之自行車後鏈輪總成的分解透視圖。 圖20為圖4中所說明之自行車後輪轂總成之鏈輪支撐主體的透視圖。 圖21為圖4中所說明之自行車後輪轂總成之鏈輪支撐主體的另一透視圖。 圖22為圖4中所說明之自行車後輪轂總成之鏈輪支撐主體的後視圖。 圖23為圖4中所說明之自行車後輪轂總成之鏈輪支撐主體的側視圖。 圖24為根據修改之自行車後輪轂總成之鏈輪支撐主體的側視圖。 圖25圖23中所說明之鏈輪支撐主體的放大橫截面圖。 圖26為圖23中所說明之鏈輪支撐主體的橫截面圖。 圖27為圖4中所說明之自行車後輪轂總成的透視圖。 圖28為圖4中所說明之自行車後輪轂總成的側視圖。 圖29為圖4中所說明之自行車後輪轂總成的後視圖。 圖30為圖4中所說明之自行車後輪轂總成之鏈輪支撐主體及複數個間隔件的分解透視圖。 圖31為圖4中所說明之自行車傳動系統之部分放大截面視圖。 圖32為圖8中所說明之鏈輪的另一側視圖。 圖33為圖9中所說明之鏈輪的側視圖。 圖34為根據修改之圖9中所說明之鏈輪的側視圖。 圖35為圖29中所說明之鏈輪的放大截面視圖。 圖36為圖29中所說明之鏈輪的另一橫截面圖。 圖37為圖2中所說明之自行車傳動系統的另一橫截面圖。 圖38為圖7及圖8中所說明之鏈輪的分解透視圖。 圖39為圖7及圖8中所說明之鏈輪的另一分解透視圖。 圖40為圖4中所說明之自行車後輪轂總成之一部分的分解透視圖。 圖41為圖40中所說明之自行車後輪轂總成之一部分的分解透視圖。 圖42為圖40中所說明之自行車後輪轂總成之一部分的分解透視圖。 圖43為圖40中所說明之自行車後輪轂總成之一部分的分解透視圖。 圖44為圖40中所說明之自行車後輪轂總成的部分橫截面圖。 圖45為沿著圖44之線XLV-XLV截取之自行車後輪轂總成的橫截面圖。 圖46為圖40中所說明之自行車後輪轂總成之間隔件的透視圖。 圖47為圖40中所說明之自行車後輪轂總成之間隔件的另一透視圖。 圖48為展示圖40中所說明之自行車輪轂後總成之第一棘輪構件及鏈輪支撐主體之動作(踩踏)的示意圖。 圖49為展示圖40中所說明之自行車後輪轂總成之第一棘輪構件及鏈輪支撐主體之作用(惰轉)的示意圖。 圖50為根據修改之鏈輪支撐主體的放大橫截面圖。 圖51為根據修改之鏈輪的放大截面視圖。 圖52為根據修改之自行車後輪轂總成之鏈輪支撐主體的側視圖。 圖53為圖52中所說明之鏈輪支撐主體的放大橫截面圖。 圖54為根據修改之自行車後鏈輪總成之鏈輪的分解透視圖。 圖55為根據修改之自行車後鏈輪總成之鏈輪的另一分解透視圖。 圖56為根據修改之自行車後鏈輪總成之鏈輪的側視圖。 圖57為根據修改之自行車後鏈輪總成之鏈輪的側視圖。 圖58為根據修改之自行車後鏈輪總成之鏈輪的側視圖。 圖59為圖57中所說明之鏈輪的側視圖。 圖60為圖57中所說明之鏈輪之放大截面視圖。 圖61為根據修改自行車後鏈輪總成之鏈輪支撐構件的部分側視圖。 圖62為根據修改之自行車傳動系統之橫截面圖。When considered in conjunction with the drawings, and with reference to the following embodiments, a more complete evaluation of the present invention and its many accompanying advantages will be readily available and will also become better understood. FIG. 1 is a schematic diagram of a bicycle transmission system according to an embodiment. FIG. 2 is an exploded perspective view of the bicycle transmission system illustrated in FIG. 1. FIG. FIG. 3 is a cross-sectional view of the bicycle transmission system taken along line III-III of FIG. 2. 4 is a perspective view of a bicycle rear hub assembly of the bicycle transmission system illustrated in FIG. 2, the bicycle rear hub assembly having a locking member of the bicycle rear sprocket assembly. 5 is a side view of a bicycle rear sprocket assembly of the bicycle transmission system illustrated in FIG. 1. FIG. 6 is an enlarged cross-sectional view of the bicycle transmission system illustrated in FIG. 4. FIG. 7 is a side view of a sprocket of the bicycle rear sprocket assembly illustrated in FIG. 5. FIG. 8 is a side view of a sprocket of the bicycle rear sprocket assembly illustrated in FIG. 5. FIG. 9 is a side view of a sprocket of the bicycle rear sprocket assembly illustrated in FIG. 5. FIG. 10 is a side view of the first sprocket of the bicycle rear sprocket assembly illustrated in FIG. 5. 11 is a side view of a sprocket of the bicycle rear sprocket assembly illustrated in FIG. 5. FIG. 12 is a side view of a sprocket of the bicycle rear sprocket assembly illustrated in FIG. 5. 13 is a side view of a sprocket of the bicycle rear sprocket assembly illustrated in FIG. 5. FIG. 14 is a side view of a sprocket of the bicycle rear sprocket assembly illustrated in FIG. 5. 15 is a side view of a sprocket of the bicycle rear sprocket assembly illustrated in FIG. 5. 16 is a side view of a sprocket of the bicycle rear sprocket assembly illustrated in FIG. 5. FIG. 17 is a side view of a sprocket of the bicycle rear sprocket assembly illustrated in FIG. 5. 18 is a side view of a sprocket of the bicycle rear sprocket assembly illustrated in FIG. 5. FIG. 19 is an exploded perspective view of the bicycle rear sprocket assembly illustrated in FIG. 5. 20 is a perspective view of a sprocket support body of the bicycle rear hub assembly illustrated in FIG. 4. 21 is another perspective view of a sprocket support body of the bicycle rear hub assembly illustrated in FIG. 4. 22 is a rear view of a sprocket support body of the bicycle rear hub assembly illustrated in FIG. 4. 23 is a side view of a sprocket support body of the bicycle rear hub assembly illustrated in FIG. 4. FIG. 24 is a side view of a sprocket support body of a bicycle rear hub assembly according to a modification. FIG. 25 is an enlarged cross-sectional view of the sprocket support body illustrated in FIG. 23. FIG. 26 is a cross-sectional view of the sprocket support body illustrated in FIG. 23. FIG. 27 is a perspective view of the bicycle rear hub assembly illustrated in FIG. 4. FIG. FIG. 28 is a side view of the bicycle rear hub assembly illustrated in FIG. 4. FIG. 29 is a rear view of the bicycle rear hub assembly illustrated in FIG. 4. 30 is an exploded perspective view of a sprocket support body and a plurality of spacers of the bicycle rear hub assembly illustrated in FIG. 4. FIG. 31 is a partially enlarged sectional view of the bicycle transmission system illustrated in FIG. 4. FIG. 32 is another side view of the sprocket illustrated in FIG. 8. FIG. FIG. 33 is a side view of the sprocket illustrated in FIG. 9. FIG. 34 is a side view of the sprocket illustrated in FIG. 9 according to a modification. FIG. 35 is an enlarged cross-sectional view of the sprocket illustrated in FIG. 29. FIG. 36 is another cross-sectional view of the sprocket illustrated in FIG. 29. FIG. 37 is another cross-sectional view of the bicycle transmission system illustrated in FIG. 2. FIG. 38 is an exploded perspective view of the sprocket illustrated in FIGS. 7 and 8. FIG. 39 is another exploded perspective view of the sprocket illustrated in FIGS. 7 and 8. FIG. 40 is an exploded perspective view of a portion of the bicycle rear hub assembly illustrated in FIG. 4. FIG. FIG. 41 is an exploded perspective view of a portion of the bicycle rear hub assembly illustrated in FIG. 40. FIG. 42 is an exploded perspective view of a portion of the bicycle rear hub assembly illustrated in FIG. 40. FIG. FIG. 43 is an exploded perspective view of a portion of the bicycle rear hub assembly illustrated in FIG. 40. FIG. 44 is a partial cross-sectional view of the bicycle rear hub assembly illustrated in FIG. 40. FIG. 45 is a cross-sectional view of the bicycle rear hub assembly taken along line XLV-XLV of FIG. 44. FIG. 46 is a perspective view of a spacer of the bicycle rear hub assembly illustrated in FIG. 40. FIG. 47 is another perspective view of the spacer of the bicycle rear hub assembly illustrated in FIG. 40. FIG. 48 is a schematic diagram showing the movement (stepping) of the first ratchet member and the sprocket support body of the rear assembly of the bicycle hub illustrated in FIG. 40. FIG. 49 is a schematic view showing the function (idling) of the first ratchet member and the sprocket support body of the bicycle rear hub assembly illustrated in FIG. 40. FIG. 50 is an enlarged cross-sectional view of a sprocket support body according to a modification. FIG. 51 is an enlarged sectional view of a sprocket according to a modification. FIG. 52 is a side view of a sprocket support body of a bicycle rear hub assembly according to a modification. FIG. 53 is an enlarged cross-sectional view of the sprocket support body illustrated in FIG. 52. FIG. 54 is an exploded perspective view of a sprocket of a bicycle rear sprocket assembly according to a modification. FIG. 55 is another exploded perspective view of a sprocket of a bicycle rear sprocket assembly according to a modification. FIG. 56 is a side view of a sprocket of a bicycle rear sprocket assembly according to a modification. Figure 57 is a side view of a sprocket of a bicycle rear sprocket assembly according to a modification. FIG. 58 is a side view of a sprocket of a bicycle rear sprocket assembly according to a modification. FIG. 59 is a side view of the sprocket illustrated in FIG. 57. FIG. 60 is an enlarged cross-sectional view of the sprocket illustrated in FIG. 57. FIG. 61 is a partial side view of a sprocket support member of a rear sprocket assembly according to a modification. FIG. 62 is a cross-sectional view of a bicycle transmission system according to a modification.

Claims (56)

一種自行車後輪轂總成，其包含： 一輪轂軸，其包括具有等於或大於13 mm之一最小內徑的一軸通孔； 一輪轂主體，其圍繞該自行車後輪轂總成之一旋轉中心軸線可旋轉地安裝於該輪轂軸上；及 一鏈輪支撐主體，其圍繞該旋轉中心軸線可旋轉地安裝於該輪轂軸上。A bicycle rear hub assembly includes: a hub shaft including a shaft through hole having a minimum inner diameter equal to or greater than 13 mm; and a hub body surrounding a center axis of rotation of the bicycle rear hub assembly. Rotatably mounted on the hub shaft; and a sprocket support body rotatably mounted on the hub shaft about the rotation center axis. 如請求項1之自行車後輪轂總成，其中 該軸通孔之該最小內徑等於或大於14 mm。If the bicycle rear hub assembly of claim 1, wherein the minimum inner diameter of the shaft through hole is equal to or greater than 14 mm. 如請求項1之自行車後輪轂總成，其中 該軸通孔之該最小內徑等於或小於21 mm。If the bicycle rear hub assembly of claim 1, wherein the minimum inner diameter of the shaft through hole is equal to or less than 21 mm. 如請求項1之自行車後輪轂總成，其中 該輪轂軸具有等於或大於17 mm之一最大外徑。The bicycle rear hub assembly of claim 1, wherein the hub shaft has a maximum outer diameter equal to or greater than 17 mm. 如請求項4之自行車後輪轂總成，其中 該輪轂軸之該最大外徑等於或大於20 mm。As in the bicycle rear hub assembly of claim 4, wherein the maximum outer diameter of the hub shaft is equal to or greater than 20 mm. 如請求項4之自行車後輪轂總成，其中 該輪轂軸之該最大外徑等於或小於23 mm。As in the bicycle rear hub assembly of claim 4, wherein the maximum outer diameter of the hub axle is 23 mm or less. 如請求項1之自行車後輪轂總成，其中 該鏈輪支撐主體包括經構形以與一自行車後鏈輪總成嚙合之至少十個外部花鍵齒，該至少十個外部花鍵齒中之每一者具有一外部花鍵傳動表面及一外部花鍵非傳動表面。If the bicycle rear hub assembly of claim 1, wherein the sprocket support body includes at least ten external spline teeth configured to mesh with a bicycle rear sprocket assembly, one of the at least ten external spline teeth Each has an external spline drive surface and an external spline non-drive surface. 如請求項7之自行車後輪轂總成，其中 該至少十個外部花鍵齒之一總數目等於或大於20。The bicycle rear hub assembly of claim 7, wherein the total number of one of the at least ten external spline teeth is equal to or greater than 20. 如請求項7之自行車後輪轂總成，其中 該至少十個外部花鍵齒之一總數目等於或大於25。As in the bicycle rear hub assembly of claim 7, wherein the total number of one of the at least ten external spline teeth is equal to or greater than 25. 如請求項7之自行車後輪轂總成，其中 該至少十個外部花鍵齒之一總數目等於或大於28。As in the bicycle rear hub assembly of claim 7, wherein the total number of one of the at least ten external spline teeth is equal to or greater than 28. 如請求項7之自行車後輪轂總成，其中 該至少十個外部花鍵齒中之至少一者具有等於或小於27 mm之一軸向花鍵齒長度。The bicycle rear hub assembly of claim 7, wherein at least one of the at least ten outer spline teeth has an axial spline tooth length equal to or less than 27 mm. 如請求項11之自行車後輪轂總成，其中 該軸向花鍵齒長度等於或大於22 mm。The bicycle rear hub assembly of claim 11, wherein the axial spline tooth length is equal to or greater than 22 mm. 如請求項7之自行車後輪轂總成，其中 該至少十個外部花鍵齒具有一第一外部周節角及不同於該第一外部周節角之一第二外部周節角。The bicycle rear hub assembly of claim 7, wherein the at least ten external spline teeth have a first external peripheral angle and a second external peripheral angle different from the first external peripheral angle. 如請求項7之自行車後輪轂總成，其中 該至少十個外部花鍵齒中之至少兩個外部花鍵齒相對於該旋轉中心軸線按一第一外部周節角沿圓周配置，且 該第一外部周節角範圍介於5度至36度。For example, the bicycle rear hub assembly of claim 7, wherein at least two outer spline teeth of the at least ten outer spline teeth are arranged circumferentially at a first outer pitch angle with respect to the rotation center axis, and the first An external perimeter angle ranges from 5 degrees to 36 degrees. 如請求項14之自行車後輪轂總成，其中 該第一外部周節角範圍介於10度至20度。The bicycle rear hub assembly of claim 14, wherein the first outer perimeter angle ranges from 10 degrees to 20 degrees. 如請求項15之自行車後輪轂總成，其中 該第一外部周節角等於或小於15度。The bicycle rear hub assembly of claim 15, wherein the first outer peripheral angle is equal to or less than 15 degrees. 如請求項1之自行車後輪轂總成，其中 該鏈輪支撐主體包括經構形以與一自行車後鏈輪總成嚙合之至少一個外部花鍵齒，且 該至少一個外部花鍵齒具有等於或小於34 mm之一外部花鍵頂徑。The bicycle rear hub assembly of claim 1, wherein the sprocket support body includes at least one external spline tooth configured to mesh with a bicycle rear sprocket assembly, and the at least one external spline tooth has an equal or Top diameter of external spline less than 34 mm. 如請求項17之自行車後輪轂總成，其中 該外部花鍵頂徑等於或小於33 mm。The bicycle rear hub assembly of claim 17, wherein the external spline top diameter is equal to or less than 33 mm. 如請求項17之自行車後輪轂總成，其中 該外部花鍵頂徑等於或大於29 mm。The bicycle rear hub assembly of claim 17, wherein the external spline top diameter is equal to or greater than 29 mm. 如請求項1之自行車後輪轂總成，其中 該鏈輪支撐主體包括經構形以與一自行車後鏈輪總成嚙合之至少一個外部花鍵齒，且 該至少一個外部花鍵齒具有等於或小於32 mm之一外部花鍵底徑。The bicycle rear hub assembly of claim 1, wherein the sprocket support body includes at least one external spline tooth configured to mesh with a bicycle rear sprocket assembly, and the at least one external spline tooth has an equal or Bottom diameter of external spline less than 32 mm. 如請求項20之自行車後輪轂總成，其中 該外部花鍵底徑等於或小於31 mm。The bicycle rear hub assembly of claim 20, wherein the bottom diameter of the external spline is 31 mm or less. 如請求項20之自行車後輪轂總成，其中 該外部花鍵底徑等於或大於28 mm。The bicycle rear hub assembly of claim 20, wherein the outer diameter of the outer spline is equal to or greater than 28 mm. 如請求項1之自行車後輪轂總成，其中 該鏈輪支撐主體包括經構形以與一自行車後鏈輪總成嚙合之至少一個外部花鍵齒， 該至少一個外部花鍵齒包括複數個外部花鍵齒，該複數個外部花鍵齒包括複數個外部花鍵傳動表面以在踩踏期間接收來自該自行車後鏈輪總成之一傳動旋轉力， 該複數個外部花鍵傳動表面各自包括 一徑向最外邊緣， 一徑向最內邊緣，及 一徑向長度，其係自該徑向最外邊緣至該徑向最內邊緣界定，且 該複數個外部花鍵傳動表面之該等徑向長度的一總和等於或大於7 mm。The bicycle rear hub assembly of claim 1, wherein the sprocket support body includes at least one external spline tooth configured to mesh with a bicycle rear sprocket assembly, and the at least one external spline tooth includes a plurality of external Spline teeth, the plurality of external spline teeth include a plurality of external spline drive surfaces to receive a driving rotational force from a bicycle rear sprocket assembly during pedaling, each of the plurality of external spline drive surfaces includes a diameter The outermost edge, a radially innermost edge, and a radial length are defined from the radially outermost edge to the radially innermost edge, and the radial directions of the plurality of external spline drive surfaces A total length is equal to or greater than 7 mm. 如請求項23之自行車後輪轂總成，其中 該等徑向長度之該總和等於或大於10 mm。If the bicycle rear hub assembly of claim 23, wherein the total of the radial lengths is equal to or greater than 10 mm. 如請求項23之自行車後輪轂總成，其中 該等徑向長度之該總和等於或大於15 mm。If the bicycle rear hub assembly of claim 23, wherein the total of the radial lengths is equal to or greater than 15 mm. 如請求項23之自行車後輪轂總成，其中 該等徑向長度之該總和等於或小於36 mm。If the bicycle rear hub assembly of claim 23, wherein the sum of the radial lengths is equal to or less than 36 mm. 如請求項1之自行車後輪轂總成，其中 該輪轂主體包括： 一第一輪輻安裝部分，其具有一第一軸向最外部分； 一第二輪輻安裝部分，其具有一第二軸向最外部分；及 一第一軸向長度，其相對於該自行車後鏈輪總成之該旋轉中心軸線在一軸向方向上界定於該第一輪輻安裝部分之該第一軸向最外部分與該第二輪輻安裝部分之該第二軸向最外部分之間，該第一軸向長度等於或大於55 mm。The bicycle rear hub assembly of claim 1, wherein the hub body includes: a first spoke mounting portion having a first axially outermost portion; a second spoke mounting portion having a second axial direction The outermost portion; and a first axial length defined in the first axial outermost portion of the first spoke mounting portion in an axial direction relative to the rotation center axis of the bicycle rear sprocket assembly Between the second axially outermost portion of the second spoke mounting portion, the first axial length is equal to or greater than 55 mm. 如請求項27之自行車後輪轂總成，其中 該第一軸向長度等於或大於60 mm。The bicycle rear hub assembly of claim 27, wherein the first axial length is equal to or greater than 60 mm. 如請求項27之自行車後輪轂總成，其中 該第一軸向長度等於或大於65 mm。The bicycle rear hub assembly of claim 27, wherein the first axial length is equal to or greater than 65 mm. 如請求項1之自行車後輪轂總成，其中 該輪轂軸包括： 一第一軸向框架鄰接表面，其經構形以在該自行車後輪轂總成安裝至一自行車框架之一狀態下相對於該自行車後鏈輪總成之該旋轉中心軸線在一軸向方向上鄰接該自行車框架之一第一部分； 一第二軸向框架鄰接表面，其經構形以在該自行車後輪轂總成安裝至該自行車框架之該狀態中在該軸向方向上鄰接該自行車框架之一第二部分；及 一第二軸向長度，其在該軸向方向上界定於該第一軸向框架鄰接表面與該第二軸向框架鄰接表面之間，該第二軸向長度等於或大於140 mm。The bicycle rear hub assembly of claim 1, wherein the hub shaft includes: a first axial frame abutting surface configured to be opposite to the bicycle rear hub assembly when the bicycle rear hub assembly is mounted to one of the bicycle frames. The rotation center axis of the bicycle rear sprocket assembly abuts a first portion of the bicycle frame in an axial direction; a second axial frame abutment surface is configured to be mounted to the bicycle rear hub assembly In this state of the bicycle frame, a second portion of the bicycle frame is abutted in the axial direction; and a second axial length is defined in the axial direction between the abutting surface of the first axial frame and the first axial frame. Between two abutting surfaces of the axial frame, the second axial length is equal to or greater than 140 mm. 如請求項30之自行車後輪轂總成，其中 該第二軸向長度等於或大於145 mm。The bicycle rear hub assembly of claim 30, wherein the second axial length is equal to or greater than 145 mm. 如請求項30之自行車後輪轂總成，其中 該第二軸向長度等於或大於147 mm。The bicycle rear hub assembly of claim 30, wherein the second axial length is equal to or greater than 147 mm. 如請求項1之自行車後輪轂總成，其進一步包含 一自由輪結構，其包括 一第一棘輪構件，其包括至少一個第一棘輪齒，及 一第二棘輪構件，其包括經構形以按一扭矩傳遞方式與該至少一個第一棘輪齒嚙合之至少一個第二棘輪齒，其中 該第一棘輪構件經構形以按一扭矩傳遞方式與該輪轂主體及該鏈輪支撐主體中之一者嚙合， 該第二棘輪構件經構形以按一扭矩傳遞方式與該輪轂主體及該鏈輪支撐主體中之另一者嚙合，且 該第一棘輪構件及該第二棘輪構件中之至少一者可在相對於該旋轉中心軸線之一軸向方向上相對於該輪轂軸移動。The bicycle rear hub assembly of claim 1, further comprising a free wheel structure including a first ratchet member including at least one first ratchet tooth, and a second ratchet member including a warp member configured to press At least one second ratchet tooth meshing with the at least one first ratchet tooth in a torque transmitting manner, wherein the first ratchet member is configured to communicate with one of the hub body and the sprocket supporting body in a torque transmitting manner Meshing, the second ratchet member is configured to mesh with the other of the hub body and the sprocket support body in a torque transmitting manner, and at least one of the first ratchet member and the second ratchet member It is movable relative to the hub shaft in an axial direction relative to the center axis of rotation. 如請求項33之自行車後輪轂總成，其中 該至少一個第一棘輪齒安置於該第一棘輪構件之一軸向表面上， 該至少一個第二棘輪齒安置於該第二棘輪構件之一軸向表面上，且 該第二棘輪構件之該軸向表面面向該第一棘輪構件之該軸向表面。The bicycle rear hub assembly of claim 33, wherein the at least one first ratchet tooth is disposed on an axial surface of the first ratchet member, and the at least one second ratchet tooth is disposed on an axis of the second ratchet member. Upward, and the axial surface of the second ratchet member faces the axial surface of the first ratchet member. 如請求項33之自行車後輪轂總成，其中 該鏈輪支撐主體具有具有一第一螺旋花鍵之一外周邊表面，且 該第一棘輪構件經構形以按一扭矩傳遞方式與該鏈輪支撐主體嚙合，且包括與該第一螺旋花鍵配合之一第二螺旋花鍵。The bicycle rear hub assembly of claim 33, wherein the sprocket support body has an outer peripheral surface having a first spiral spline, and the first ratchet member is configured to communicate with the sprocket in a torque transmitting manner The support body is engaged and includes a second spiral spline that cooperates with the first spiral spline. 如請求項35之自行車後輪轂總成，其中 該鏈輪支撐主體之該外周邊表面具有經構形以在惰轉期間朝向該輪轂主體導引該第一棘輪構件之一導引部分。The bicycle rear hub assembly of claim 35, wherein the outer peripheral surface of the sprocket support body has a guide portion configured to guide one of the first ratchet members toward the hub body during idle rotation. 如請求項36之自行車後輪轂總成，其中 該導引部分在惰轉期間朝向該輪轂主體導引該第一棘輪構件以解除該至少一個第一棘輪齒與該至少一個第二棘輪齒之間的一嚙合。The bicycle rear hub assembly of claim 36, wherein the guide portion guides the first ratchet member toward the hub body during idle rotation to release between the at least one first ratchet tooth and the at least one second ratchet tooth Of a mesh. 如請求項36之自行車後輪轂總成，其中 該導引部分在相對於該鏈輪支撐主體之至少一圓周方向上延伸。The bicycle rear hub assembly of claim 36, wherein the guide portion extends in at least one circumferential direction with respect to the sprocket support body. 如請求項36之自行車後輪轂總成，其中 該導引部分經配置以與該第一螺旋花鍵界定一鈍角。The bicycle rear hub assembly of claim 36, wherein the guide portion is configured to define an obtuse angle with the first spiral spline. 如請求項33之自行車後輪轂總成，其中 該第一棘輪構件及該第二棘輪構件中之每一者具有一環狀形狀。The bicycle rear hub assembly of claim 33, wherein each of the first ratchet member and the second ratchet member has an annular shape. 如請求項1之自行車後輪轂總成，其進一步包含 一制動轉子支撐主體，其包括經構形以與一自行車制動轉子嚙合之至少一個額外外部花鍵齒，其中 該至少一個額外外部花鍵齒具有大於該外部花鍵頂徑之一額外外部花鍵頂徑。The bicycle rear hub assembly of claim 1, further comprising a brake rotor support body including at least one additional external spline tooth configured to mesh with a bicycle brake rotor, wherein the at least one additional external spline tooth Has an extra outer spline tip diameter that is larger than one of the outer spline tip diameters. 如請求項7之自行車後輪轂總成，其中 該至少十個外部花鍵齒中之至少一者相對於一參考線沿圓周對稱，該參考線相對於該旋轉中心軸線在一徑向方向上自該旋轉中心軸線延伸至該至少十個外部花鍵齒中之該至少一者之一徑向最外端的一圓周中心點。For example, the bicycle rear hub assembly of claim 7, wherein at least one of the at least ten external spline teeth is circumferentially symmetrical with respect to a reference line, the reference line is The rotation center axis extends to a circumferential center point on the radially outermost end of one of the at least one of the at least ten external spline teeth. 如請求項42之自行車後輪轂總成，其中 該複數個外部花鍵傳動表面中之至少一個表面具有界定於該外部花鍵傳動表面與一第一徑向線之間的一第一外部花鍵表面角，該第一徑向線自該自行車後輪轂總成之一旋轉中心軸線延伸至該外部花鍵傳動表面之一徑向最外邊緣，且 該第一外部花鍵表面角等於或小於6度。The bicycle rear hub assembly of claim 42, wherein at least one of the plurality of external spline drive surfaces has a first external spline defined between the external spline drive surface and a first radial line A surface angle, the first radial line extending from a rotation center axis of the bicycle rear hub assembly to a radially outermost edge of the external spline transmission surface, and the first external spline surface angle being equal to or less than 6 degree. 如請求項43之自行車後輪轂總成，其中 該等外部花鍵非傳動表面中之至少一者具有界定於該外部花鍵非傳動表面與一第二徑向線之間的一第二外部花鍵表面角，該第二徑向線自該自行車後輪轂總成之該旋轉中心軸線延伸至該外部花鍵非傳動表面之一徑向最外邊緣，且 該第二外部花鍵表面角等於或小於6度。The bicycle rear hub assembly of claim 43, wherein at least one of the external spline non-drive surfaces has a second external flower defined between the external spline non-drive surface and a second radial line Key surface angle, the second radial line extends from the rotation center axis of the bicycle rear hub assembly to a radially outermost edge of the outer spline non-drive surface, and the second outer spline surface angle is equal to or Less than 6 degrees. 一種自行車後輪轂總成，其包含： 一輪轂軸； 一輪轂主體，其圍繞該自行車後輪轂總成之一旋轉中心軸線可旋轉地安裝於該輪轂軸上；及 一鏈輪支撐主體，其圍繞該旋轉中心軸線可旋轉地安裝於該輪轂軸上，該鏈輪支撐主體包括經構形以與一自行車後鏈輪總成嚙合之至少十個外部花鍵齒，該至少十個外部花鍵齒中之每一者具有一外部花鍵傳動表面及一外部花鍵非傳動表面，該至少十個外部花鍵齒中之至少一者相對於一參考線沿圓周對稱，該參考線相對於該旋轉中心軸線在一徑向方向上自該旋轉中心軸線延伸至該至少十個外部花鍵齒中之該至少一者之一徑向最外端的一圓周中心點。A bicycle rear hub assembly includes: a hub shaft; a hub body that is rotatably mounted on the hub shaft around a rotation center axis of the bicycle rear hub assembly; and a sprocket support body that surrounds The rotation center axis is rotatably mounted on the hub shaft, and the sprocket support body includes at least ten external spline teeth configured to mesh with a bicycle rear sprocket assembly, and the at least ten external spline teeth Each of them has an external spline drive surface and an external spline non-drive surface, at least one of the at least ten external spline teeth is circumferentially symmetrical with respect to a reference line, the reference line being relative to the rotation The central axis extends from the rotation central axis in a radial direction to a circumferential center point radially outward of one of the at least one of the at least ten outer spline teeth. 如請求項45之自行車後輪轂總成，其中 該至少十個外部花鍵齒之一總數目等於或大於28。The bicycle rear hub assembly of claim 45, wherein the total number of one of the at least ten external spline teeth is equal to or greater than 28. 如請求項45之自行車後輪轂總成，其中 該等外部花鍵傳動表面中之至少一個表面具有界定於該外部花鍵傳動表面與一第一徑向線之間的一第一外部花鍵表面角，該第一徑向線自該自行車後輪轂總成之一旋轉中心軸線延伸至該外部花鍵傳動表面之一徑向最外邊緣，且 該第一外部花鍵表面角等於或小於6度。The bicycle rear hub assembly of claim 45, wherein at least one of the external spline drive surfaces has a first external spline surface defined between the external spline drive surface and a first radial line Angle, the first radial line extends from a rotation center axis of the bicycle rear hub assembly to a radially outermost edge of the external spline transmission surface, and the first external spline surface angle is equal to or less than 6 degrees . 如請求項47之自行車後輪轂總成，其中 該等外部花鍵非傳動表面中之至少一者具有界定於該外部花鍵非傳動表面與一第二徑向線之間的一第二外部花鍵表面角，該第二徑向線自該自行車後輪轂總成之該旋轉中心軸線延伸至該外部花鍵非傳動表面之一徑向最外邊緣，且 該第二外部花鍵表面角等於或小於6度。The bicycle rear hub assembly of claim 47, wherein at least one of the external spline non-drive surfaces has a second external flower defined between the external spline non-drive surface and a second radial line Key surface angle, the second radial line extends from the rotation center axis of the bicycle rear hub assembly to a radially outermost edge of the outer spline non-drive surface, and the second outer spline surface angle is equal to or Less than 6 degrees. 如請求項45之自行車後輪轂總成，其中 該至少十個外部花鍵齒中之至少一者具有等於或小於27 mm之一軸向花鍵齒長度。The bicycle rear hub assembly of claim 45, wherein at least one of the at least ten outer spline teeth has an axial spline tooth length equal to or less than 27 mm. 如請求項7之自行車後輪轂總成，其中 該至少十個外部花鍵齒中之至少一者具有等於或小於27 mm之一軸向花鍵齒長度。The bicycle rear hub assembly of claim 7, wherein at least one of the at least ten outer spline teeth has an axial spline tooth length equal to or less than 27 mm. 如請求項7之自行車後輪轂總成，其中 該至少十個外部花鍵齒之一總數目範圍介於22至24。The bicycle rear hub assembly of claim 7, wherein the total number of one of the at least ten external spline teeth ranges from 22 to 24. 如請求項13之自行車後輪轂總成，其中 該第一外部周節角範圍介於13度至17度，且 該第二外部周節角範圍介於28度至32度。For example, the bicycle rear hub assembly of claim 13, wherein the first outer perimeter angle ranges from 13 degrees to 17 degrees, and the second outer perimeter angle ranges from 28 degrees to 32 degrees. 如請求項13之自行車後輪轂總成，其中 該第一外部周節角為該第二外部周節角之一半。For example, the bicycle rear hub assembly of claim 13, wherein the first outer perimeter angle is a half of the second outer perimeter angle. 如請求項14之自行車後輪轂總成，其中 該第一外部周節角範圍介於13度至17度。The bicycle rear hub assembly of claim 14, wherein the first outer perimeter angle ranges from 13 degrees to 17 degrees. 如請求項45之自行車後輪轂總成，其中 該至少十個外部花鍵齒之一總數目範圍介於22至24。The bicycle rear hub assembly of claim 45, wherein the total number of one of the at least ten external spline teeth ranges from 22 to 24. 如請求項23之自行車後輪轂總成，其中 該複數個外部花鍵傳動表面之該等徑向長度的該總和範圍介於11 mm至14 mm。If the bicycle rear hub assembly of claim 23, wherein the sum of the radial lengths of the plurality of external spline drive surfaces ranges from 11 mm to 14 mm.
TW107116092A 2017-05-30 2018-05-11 Bicycle rear hub assembly TWI786113B (en)

Applications Claiming Priority (18)

Application Number Priority Date Filing Date Title
US15/608,915 2017-05-30
US15/608,924 US11332213B2 (en) 2017-05-30 2017-05-30 Bicycle rear sprocket assembly and bicycle drive train
US15/608,915 US11059541B2 (en) 2017-05-30 2017-05-30 Bicycle hub assembly
US15/608,924 2017-05-30
US15/673,346 2017-08-09
US15/673,346 US10377174B2 (en) 2017-08-09 2017-08-09 Bicycle hub assembly
US15/686,179 2017-08-25
US15/686,179 US11220309B2 (en) 2017-05-30 2017-08-25 Bicycle rear sprocket assembly
US15/686,177 US11179967B2 (en) 2017-05-30 2017-08-25 Bicycle hub assembly
US15/686,177 2017-08-25
US201715712388A 2017-09-22 2017-09-22
US201715712407A 2017-09-22 2017-09-22
US15/712,388 2017-09-22
US15/712,407 2017-09-22
US15/851,785 2017-12-22
US15/851,781 2017-12-22
US15/851,781 US10946931B2 (en) 2017-09-22 2017-12-22 Bicycle rear sprocket assembly and bicycle drive train
US15/851,785 US10752320B2 (en) 2017-09-22 2017-12-22 Bicycle rear hub assembly

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TW111140394A TW202323129A (en) 2017-05-30 2018-05-11 Bicycle rear sprocket assembly and bicycle drive train
TW107116092A TWI786113B (en) 2017-05-30 2018-05-11 Bicycle rear hub assembly
TW107116090A TWI707802B (en) 2017-05-30 2018-05-11 Bicycle rear sprocket assembly and bicycle drive train
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