TW201900493A - Bicycle rear sprocket assembly - Google Patents

Abstract

A bicycle rear sprocket assembly comprises at least one sprocket having a total tooth number that is equal to or larger than 15. The at least one sprocket includes at least ten internal spline teeth configured to engage with a bicycle hub assembly.

Description

自行車後鏈輪總成Bicycle rear sprocket assembly

本發明係關於一種自行車後鏈輪總成。The invention relates to a bicycle rear sprocket assembly.

騎車正變成更日益流行的消遣形式以及交通方式。此外，騎車已變成業餘及專業人員兩者之非常流行的競技運動。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傳動系統。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 driveline.

根據本發明之第一態樣，一種自行車後鏈輪總成包含具有等於或大於15之一總齒數的至少一個鏈輪。該至少一個鏈輪包括經構形以與一自行車輪轂總成嚙合之至少十個內部花鍵齒。 在根據第一態樣之自行車後鏈輪總成之情況下，相比於包括九個或更少內部花鍵齒之鏈輪，至少十個內部花鍵齒減少施加至至少十個內部花鍵齒中之每一者的旋轉力。此改良至少一個鏈輪之耐久性及/或改良挑選至少一個鏈輪之材料的自由度而不降低至少一個鏈輪之耐久性。 根據本發明之第二態樣，如第一態樣之自行車後鏈輪總成經構形以使得該至少十個內部花鍵齒之一總數目等於或大於20。 在根據第二態樣之自行車後鏈輪總成之情況下，相比於包括九個或更少內部花鍵齒之鏈輪支撐主體，至少二十個內部花鍵齒減少施加至至少二十個內部花鍵齒中之每一者的旋轉力。此改良至少一個鏈輪之耐久性及/或改良挑選至少一個鏈輪之材料的自由度而不降低至少一個鏈輪之耐久性。 根據本發明之第三態樣，如第二態樣之自行車後鏈輪總成經構形以使得該至少十個內部花鍵齒之該總數目等於或大於25。 在根據第三態樣之自行車後鏈輪總成之情況下，相比於包括九個或更少內部花鍵齒之鏈輪，至少二十五個內部花鍵齒進一步減少施加至至少二十五個內部花鍵齒中之每一者的旋轉力。此進一步改良至少一個鏈輪之耐久性及/或改良挑選至少一個鏈輪之材料的自由度而不降低至少一個鏈輪之耐久性。 根據本發明之第四態樣，如第一態樣至第三態樣中任一項之自行車後鏈輪總成經構形以使得該至少十個內部花鍵齒具有一第一內部周節角及不同於該第一內部周節角之一第二內部周節角。 在根據第四態樣之自行車後鏈輪總成之情況下，第一內部周節角與第二內部周節角之間的差異幫助使用者將自行車後鏈輪總成正確地安裝至自行車輪轂總成，尤其是關於自行車後鏈輪總成之每一鏈輪之圓周位置。 根據本發明之第五態樣，如第一態樣至第四態樣中任一項之自行車後鏈輪總成經構形以使得該至少一個鏈輪包括至少十個鏈輪。 在根據第五態樣之自行車後鏈輪總成之情況下，至少十個鏈輪實現自行車後鏈輪之寬範圍。 根據本發明之第六態樣，如第一態樣至第四態樣中任一項之自行車後鏈輪總成經構形以使得該至少一個鏈輪包括至少十一個鏈輪。 在根據第六態樣之自行車後鏈輪總成之情況下，至少十一個鏈輪實現自行車後鏈輪之更寬範圍。 根據本發明之第七態樣，如第一態樣至第四態樣中任一項之自行車後鏈輪總成經構形以使得該至少一個鏈輪包括至少十二個鏈輪。 在根據第七態樣之自行車後鏈輪總成之情況下，至少十二個鏈輪實現自行車後鏈輪之更寬範圍。 根據本發明之第八態樣，如第一態樣至第七態樣中任一項之自行車後鏈輪總成經構形以使得該至少一個鏈輪包括複數個鏈輪及經構形以與一自行車輪轂總成嚙合之至少一個內部花鍵齒。該複數個鏈輪包括具有一齒尖直徑之一最大鏈輪。該至少一個內部花鍵齒具有一內部花鍵底徑。該內部花鍵底徑對該齒尖直徑之一比率在0.1至0.2之範圍內。 在根據第八態樣之自行車後鏈輪總成之情況下，比率實現自行車後鏈輪總成之寬範圍，同時改良至少一個鏈輪之耐久性。 根據本發明之第九態樣，如第一態樣至第八態樣中任一項之自行車後鏈輪總成經構形以使得該至少一個鏈輪包括一第一鏈輪及一第二鏈輪。該第一鏈輪具有一第一總齒數。該第二鏈輪具有小於該第一總齒數之一第二總齒數。該第一鏈輪包括至少一個第一移位促進區域以促進一自行車鏈自該第二鏈輪移位至該第一鏈輪之一第一移位操作，且包括至少一個第二移位促進區域以促進該自行車鏈自該第一鏈輪移位至該第二鏈輪之一第二移位操作。 在根據第九態樣之自行車後鏈輪總成之情況下，至少一個第一移位促進區域及至少一個第二移位促進區域使得第一移位操作及第二移位操作更順利。 根據本發明之第十態樣，如第一態樣至第九態樣中任一項之自行車後鏈輪總成進一步包含一鎖定構件，該鎖定構件經構形以阻止安裝於一自行車輪轂總成上之該至少一個鏈輪相對於該自行車後鏈輪總成之一旋轉中心軸線的一軸向移動。該鎖定構件包括一管狀主體部分及一突出部分。該管狀主體部分具有一中心軸線。該突出部分相對於該管狀主體部分之該中心軸線自該管狀主體部分徑向向外延伸。該管狀主體部分具有經構形以與該自行車輪轂總成之一內部帶螺紋部分嚙合的一外部帶螺紋部分。該突出部分經構形以鄰接該至少一個鏈輪。 在根據第十態樣之自行車後鏈輪總成之情況下，有可能將自行車後鏈輪總成附接至自行車輪轂總成以阻止至少一個鏈輪相對於自行車輪轂總成軸向移動。 根據本發明之第十一態樣，如第十態樣之自行車後鏈輪總成經構形以使得該管狀主體部分具有等於或小於26 mm之一第一外徑。 在根據第十一態樣之自行車後鏈輪總成之情況下，第一外徑實現自行車後鏈輪總成之寬範圍，同時阻止至少一個鏈輪相對於自行車輪轂總成之軸向移動。 根據本發明之第十二態樣，如第十一態樣之自行車後鏈輪總成經構形以使得該第一外徑等於或大於25 mm。 在根據第十二態樣之自行車後鏈輪總成之情況下，第一外徑確保鎖定構件之強度，同時實現自行車後鏈輪總成之寬範圍。 根據本發明之第十三態樣，如第十態樣至第十二態樣中任一項之自行車後鏈輪總成經構形以使得該突出部分具有等於或小於32 mm之一第二外徑。 在根據第十三態樣之自行車後鏈輪總成之情況下，第二外徑實現自行車後鏈輪總成之寬範圍，同時阻止至少一個鏈輪相對於自行車輪轂總成軸向移動。 根據本發明之第十四態樣，如第十三態樣之自行車後鏈輪總成經構形以使得該第二外徑等於或大於30 mm。 在根據第十四態樣之自行車後鏈輪總成之情況下，第二外徑確保鎖定構件之強度，同時實現自行車後鏈輪總成之寬範圍。 根據本發明之第十五態樣，如第十態樣至第十四態樣中任一項之自行車後鏈輪總成經構形以使得該鎖定構件具有一工具嚙合部分。 在根據第十五態樣之自行車後鏈輪總成之情況下，有可能易於將鎖定構件附接至自行車輪轂總成且易於將鎖定構件與自行車輪轂總成脫離。 根據本發明之第十六態樣，如第一態樣至第十五態樣中任一項之自行車後鏈輪總成進一步包含一鏈輪支撐件。該至少一個鏈輪包括附接至該鏈輪支撐件之複數個鏈輪。 在根據第十六態樣之自行車後鏈輪總成之情況下，有可能減輕自行車後鏈輪總成之重量。 根據本發明之第十七態樣，如第十六態樣之自行車後鏈輪總成經構形以使得該複數個鏈輪藉由一黏附劑附接至該鏈輪支撐件。 在根據第十七態樣之自行車後鏈輪總成之情況下，有可能減少或去除金屬緊固件。此有效地減輕自行車後鏈輪總成之重量。 根據本發明之第十八態樣，如第十六態樣或第十七態樣之自行車後鏈輪總成經構形以使得該鏈輪支撐件由包括一樹脂材料之一非金屬材料製成。 在根據第十八態樣之自行車後鏈輪總成之情況下，非金屬材料較有效地減輕自行車後鏈輪總成之重量。 根據本發明之第十九態樣，如第一態樣至第十八態樣中任一項之自行車後鏈輪總成進一步包含一後輪轂鄰接表面，該後輪轂鄰接表面經構形以在該自行車後鏈輪總成安裝至一自行車輪轂總成之一狀態中在相對於該自行車後鏈輪總成之一旋轉中心軸線的一軸向方向上鄰接該自行車輪轂總成。該至少一個鏈輪包括複數個鏈輪，該複數個鏈輪包括一最大鏈輪。該最大鏈輪具有一軸向內表面及在該軸向方向上設置於該軸向內表面之一反向側上的一軸向外表面。相比於該軸向內表面，該軸向外表面在該軸向方向上更接近該後輪轂鄰接表面。在該軸向方向上界定於該軸向內表面與該後輪轂鄰接表面之間的一軸向距離等於或大於7 mm。 在根據第十九態樣之自行車後鏈輪總成之情況下，軸向距離實現自行車後鏈輪之寬範圍。 根據本發明之第二十態樣，如第十九態樣之自行車後鏈輪總成經構形以使得該軸向距離等於或大於10 mm。 在根據第二十態樣之自行車後鏈輪總成之情況下，軸向距離進一步實現自行車後鏈輪之更寬範圍。 根據本發明之第二十一態樣，一種自行車後鏈輪總成包含至少一個鏈輪，該至少一個鏈輪具有等於或大於15之一總齒數。該至少一個鏈輪包括經構形以與一自行車輪轂總成嚙合之至少一個內部花鍵齒。該至少一個內部花鍵齒具有等於或小於30 mm之一內部花鍵底徑。 在根據第二十一態樣之自行車後鏈輪總成之情況下，有可能製造總齒數等於或小於10之自行車後鏈輪。因此，有可能在高速齒輪側上加寬自行車後鏈輪總成之齒輪範圍。第二十一態樣可與第一態樣至第二十態樣中之任一者組合。 根據本發明之第二十二態樣，如第二十一態樣之自行車後鏈輪總成經構形以使得該內部花鍵底徑等於或大於25 mm。 在根據第二十二態樣之自行車後鏈輪總成之情況下，有可能確保至少一個鏈輪之強度，同時在高速齒輪側上加寬自行車後鏈輪總成之齒輪範圍。 根據本發明之第二十三態樣，如第二十一態樣之自行車後鏈輪總成經構形以使得該內部花鍵底徑等於或大於29 mm。 在根據第二十三態樣之自行車後鏈輪總成之情況下，有可能進一步確保至少一個鏈輪之強度，同時在高速齒輪側上加寬自行車後鏈輪總成之齒輪範圍。 根據本發明之第二十四態樣，如第二十一態樣至第二十三態樣中任一項之自行車後鏈輪總成經構形以使得該至少一個內部花鍵齒具有等於或小於28 mm之一內部花鍵頂徑。 在根據第二十四態樣之自行車後鏈輪總成之情況下，內部花鍵頂徑可增大至少一個內部花鍵齒之傳動表面的徑向長度。此改良至少一個鏈輪之強度。 根據本發明之第二十五態樣，如第二十四態樣之自行車後鏈輪總成經構形以使得該內部花鍵頂徑等於或大於25 mm。 在根據第二十五態樣之自行車後鏈輪總成之情況下，有可能確保至少一個鏈輪之強度，同時在高速齒輪側上加寬自行車後鏈輪總成之齒輪範圍。 根據本發明之第二十六態樣，如第二十四態樣或第二十五態樣之自行車後鏈輪總成經構形以使得該內部花鍵頂徑等於或大於27 mm。 在根據第二十六態樣之自行車後鏈輪總成之情況下，有可能確定地確保至少一個鏈輪之強度，同時在高速齒輪側上加寬自行車後鏈輪總成之齒輪範圍。 根據本發明之第二十七態樣，如第二十一態樣至第二十六態樣中任一項之自行車後鏈輪總成經構形以使得該至少一個內部花鍵齒包括複數個內部花鍵齒，該複數個內部花鍵齒包括用以在踩踏期間接收來自該自行車輪轂總成之一傳動旋轉力的複數個內部花鍵傳動表面。該複數個內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。該等徑向長度之一總和等於或大於7 mm。 在根據第二十七態樣之自行車後鏈輪總成之情況下，有可能增大複數個內部花鍵傳動表面之徑向長度。此改良至少一個鏈輪之強度。 根據本發明之第二十八態樣，如第二十七態樣之自行車後鏈輪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。 在根據第二十八態樣之自行車後鏈輪總成之情況下，有可能進一步增大複數個內部花鍵傳動表面之徑向長度。此改良至少一個鏈輪之強度。 根據本發明之第二十九態樣，如第二十七態樣之自行車後鏈輪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。 在根據第二十九態樣之自行車後鏈輪總成之情況下，有可能進一步增大複數個外部花鍵傳動表面之徑向長度。此進一步改良至少一個鏈輪之強度。 根據本發明之第三十態樣，如第二十一態樣至第二十九態樣中任一項之自行車後鏈輪總成經構形以使得該至少一個鏈輪包括至少十個鏈輪。 在根據第三十態樣之自行車後鏈輪總成之情況下，至少十個鏈輪實現自行車後鏈輪總成之寬範圍。 根據本發明之第三十一態樣，如第二十一態樣至第二十九態樣中任一項之自行車後鏈輪總成經構形以使得該至少一個鏈輪包括至少十一個鏈輪。 在根據第三十一態樣之自行車後鏈輪總成之情況下，至少十一個鏈輪實現自行車後鏈輪總成之寬範圍。 根據本發明之第三十二態樣，如第二十一態樣至第二十九態樣中任一項之自行車後鏈輪總成經構形以使得該至少一個鏈輪包括至少十二個鏈輪。 在根據第三十二態樣之自行車後鏈輪總成之情況下，至少十二個鏈輪實現自行車後鏈輪總成之寬範圍。 根據本發明之第三十三態樣，如第二十一態樣至第三十二態樣中任一項之自行車後鏈輪總成經構形以使得該至少一個鏈輪包括複數個鏈輪。該複數個鏈輪包括具有一齒尖直徑之一最大鏈輪。該內部花鍵底徑對該齒尖直徑之一比率在0.1至0.2之範圍內。 在根據第三十三態樣之自行車後鏈輪總成之情況下，比率實現自行車後鏈輪總成之寬範圍，同時改良至少一個鏈輪之耐久性。 根據本發明之第三十四態樣，如第二十一態樣至第三十二態樣中任一項之自行車後鏈輪總成經構形以使得該至少一個鏈輪包括一第一鏈輪及一第二鏈輪。該第一鏈輪具有一第一總齒數。該第二鏈輪具有小於該第一總齒數之一第二總齒數。該第一鏈輪包括至少一個第一移位促進區域以促進一自行車鏈自該第二鏈輪移位至該第一鏈輪之一第一移位操作，且包括至少一個第二移位促進區域以促進該自行車鏈自該第一鏈輪移位至該第二鏈輪之一第二移位操作。 在根據第三十四態樣之自行車後鏈輪總成之情況下，至少一個第一移位促進區域及至少一個第二移位促進區域使得第一移位操作及第二移位操作更順利。 根據本發明之第三十五態樣，如第二十一態樣至第三十四態樣中任一項之自行車後鏈輪總成進一步包含一鎖定構件，該鎖定構件經構形以阻止安裝於一自行車輪轂總成上之該至少一個鏈輪相對於該自行車後鏈輪總成之一旋轉中心軸線的一軸向移動。該鎖定構件包括一管狀主體部分及一突出部分。該管狀主體部分具有一中心軸線。該突出部分相對於該管狀主體部分之該中心軸線自該管狀主體部分徑向向外延伸。該管狀主體部分具有經構形以與該自行車輪轂總成之一內部帶螺紋部分嚙合的一外部帶螺紋部分。該突出部分經構形以鄰接該至少一個鏈輪。 在根據第三十五態樣之自行車後鏈輪總成之情況下，有可能將自行車後鏈輪總成附接至自行車輪轂總成以阻止至少一個鏈輪相對於自行車輪轂總成軸向移動。 根據本發明之第三十六態樣，如第三十五態樣之自行車後鏈輪總成經構形以使得該管狀主體部分具有等於或小於26 mm之一第一外徑。 在根據第三十六態樣之自行車後鏈輪總成之情況下，第一外徑實現自行車後鏈輪總成之寬範圍，同時阻止至少一個鏈輪相對於自行車輪轂總成之軸向移動。 根據本發明之第三十七態樣，如第三十六態樣之自行車後鏈輪總成經構形以使得該第一外徑等於或大於25 mm。 在根據第三十七態樣之自行車後鏈輪總成之情況下，第一外徑確保鎖定構件之強度，同時實現自行車後鏈輪總成之寬範圍。 根據本發明之第三十八態樣，如第三十五態樣至第三十七態樣中任一項之自行車後鏈輪總成經構形以使得該突出部分具有等於或小於32 mm之一第二外徑。 在根據第三十八態樣之自行車後鏈輪總成之情況下，第二外徑實現自行車後鏈輪總成之寬範圍，同時阻止至少一個鏈輪相對於自行車輪轂總成軸向移動。 根據本發明之第三十九態樣，如第三十八態樣之自行車後鏈輪總成經構形以使得該第二外徑等於或大於30 mm。 在根據第三十九態樣之自行車後鏈輪總成之情況下，第二外徑確保鎖定構件之強度，同時實現自行車後鏈輪總成之寬範圍。 根據本發明之第四十態樣，如第三十五態樣至第三十九態樣中任一項之自行車後鏈輪總成經構形以使得該鎖定構件具有一工具嚙合部分。 在根據第四十態樣之自行車後鏈輪總成之情況下，有可能易於將鎖定構件附接至自行車輪轂總成且易於將鎖定構件與自行車輪轂總成脫離。 根據本發明之第四十一態樣，如第二十一態樣至第四十態樣中任一項之自行車後鏈輪總成進一步包含一鏈輪支撐件。該至少一個鏈輪包括附接至該鏈輪支撐件之複數個鏈輪。 在根據第四十一態樣之自行車後鏈輪總成之情況下，有可能減輕自行車後鏈輪總成之重量。 根據本發明之第四十二態樣，如第四十一態樣之自行車後鏈輪總成經構形以使得該複數個鏈輪藉由一黏附劑附接至該鏈輪支撐件。 在根據第四十二態樣之自行車後鏈輪總成之情況下，有可能減少或去除金屬緊固件。此有效地減輕自行車後鏈輪總成之重量。 根據本發明之第四十三態樣，如第四十一態樣或第四十二態樣之自行車後鏈輪總成經構形以使得該鏈輪支撐件由包括一樹脂材料之一非金屬材料製成。 在根據第四十三態樣之自行車後鏈輪總成之情況下，非金屬材料較有效地減輕自行車後鏈輪總成之重量。 根據本發明之第四十四態樣，如第二十一態樣至第四十三態樣中任一項之自行車後鏈輪總成進一步包含一後輪轂鄰接表面，該後輪轂鄰接表面經構形以在該自行車後鏈輪總成安裝至一自行車輪轂總成之一狀態中在相對於該自行車後鏈輪總成之一旋轉中心軸線的一軸向方向上鄰接該自行車輪轂總成。該至少一個鏈輪包括複數個鏈輪，該複數個鏈輪包括一最大鏈輪。該最大鏈輪具有一軸向內表面及在該軸向方向上設置於該軸向內表面之一反向側上的一軸向外表面。相比於該軸向內表面，該軸向外表面在該軸向方向上更接近該後輪轂鄰接表面。在該軸向方向上界定於該軸向內表面與該後輪轂鄰接表面之間的一軸向距離等於或大於7 mm。 在根據第四十四態樣之自行車後鏈輪總成之情況下，軸向距離實現自行車後鏈輪之寬範圍。 根據本發明之第四十五態樣，如第四十四態樣之自行車後鏈輪總成經構形以使得該軸向距離等於或大於10 mm。 在根據第四十五態樣之自行車後鏈輪總成之情況下，軸向距離進一步實現自行車後鏈輪之較寬範圍。 根據本發明之第四十六態樣，一種自行車後鏈輪總成包含複數個鏈輪、一後輪轂鄰接表面及一軸向距離。該複數個鏈輪包括一最大鏈輪。該最大鏈輪具有一軸向內表面及在相對於該自行車後鏈輪總成之一旋轉中心軸線的一軸向方向上設置於該軸向內表面之一反向側上的一軸向外表面。該後輪轂鄰接表面經構形以在該自行車後鏈輪總成安裝至一自行車輪轂總成之一狀態中在該軸向方向上鄰接該自行車輪轂總成，相比於該軸向內表面，該軸向外表面在該軸向方向上更接近該後輪轂鄰接表面。在該軸向方向上界定於該軸向內表面與該後輪轂鄰接表面之間的該軸向距離等於或大於7 mm。 在根據第四十六態樣之自行車後鏈輪總成之情況下，軸向距離實現自行車後鏈輪之寬範圍。 根據本發明之第四十七態樣，如第四十六態樣之自行車後鏈輪總成經構形以使得該軸向距離等於或大於10 mm。 在根據第四十七態樣之自行車後鏈輪總成之情況下，軸向距離進一步實現自行車後鏈輪之較寬範圍。 根據本發明之第四十八態樣，如第四十六態樣或第四十七態樣之自行車後鏈輪總成經構形以使得在該自行車後鏈輪總成安裝至該自行車輪轂總成之一狀態中，相比於該後輪轂鄰接表面，該軸向內表面經定位成更接近該自行車輪轂總成之一軸向中心平面。 在根據第四十八態樣之自行車後鏈輪總成之情況下，軸向距離實現自行車後鏈輪之較寬範圍。 根據本發明之第四十九態樣，如第四十六態樣至第四十八態樣中任一項之自行車後鏈輪總成經構形以使得該複數個鏈輪之一總數目為12。 在根據第四十九態樣之自行車後鏈輪總成之情況下，複數個鏈輪之總數目實現自行車後鏈輪之寬範圍。 根據本發明之第五十態樣，如第四十六態樣至第四十九態樣中任一項之自行車後鏈輪總成經構形以使得該最大鏈輪之一總齒數等於或大於39。 在根據第五十態樣之自行車後鏈輪總成之情況下，最大鏈輪之總齒數實現實現自行車後鏈輪之寬範圍。 根據本發明之第五十一態樣，如第四十六態樣至第四十九態樣中任一項之自行車後鏈輪總成經構形以使得該最大鏈輪之一總齒數等於或大於45。 在根據第五十一態樣之自行車後鏈輪總成之情況下，最大鏈輪之總齒數實現實現自行車後鏈輪之較寬範圍。According to a first aspect of the present invention, a bicycle rear sprocket assembly includes at least one sprocket having a total number of teeth equal to or greater than 15. The at least one sprocket includes at least ten internal spline teeth configured to mesh with a bicycle hub assembly. In the case of the bicycle rear sprocket assembly according to the first aspect, at least ten internal spline teeth are reduced to be applied to at least ten internal splines compared to a sprocket including nine or fewer internal spline teeth The rotational force of each of the teeth. This improves the durability of at least one sprocket and / or improves the freedom of selecting the material of at least one sprocket without reducing the durability of at least one sprocket. According to a second aspect of the invention, the bicycle rear sprocket assembly as in the first aspect is configured such that the total number of one of the at least ten internal spline teeth is equal to or greater than 20. In the case of the bicycle rear sprocket assembly according to the second aspect, at least twenty internal spline teeth are reduced to at least twenty compared to a sprocket support body including nine or fewer internal spline teeth. The rotational force of each of the two internal spline teeth. This improves the durability of at least one sprocket and / or improves the freedom of selecting the material of at least one sprocket without reducing the durability of at least one sprocket. According to a third aspect of the present invention, the bicycle rear sprocket assembly as in the second aspect is configured such that the total number of the at least ten internal spline teeth is equal to or greater than 25. In the case of the bicycle rear sprocket assembly according to the third aspect, at least twenty-five internal spline teeth are further reduced to at least twenty compared to a sprocket including nine or fewer internal spline teeth. Rotating force of each of the five internal spline teeth. This further improves the durability of the at least one sprocket and / or improves the freedom of selecting the material of the at least one sprocket without reducing the durability of the at least one sprocket. According to a fourth aspect of the present invention, the bicycle rear sprocket assembly of any one of the first aspect to the third aspect is configured so that the at least ten internal spline teeth have a first internal section And a second internal perimeter angle different from one of the first internal perimeter angle. In the case of the bicycle rear sprocket assembly according to the fourth aspect, the difference between the first internal sprocket angle and the second internal sprocket angle helps the user to properly install the bicycle rear sprocket assembly to the bicycle hub Assembly, especially regarding the circumferential position of each sprocket of a bicycle rear sprocket assembly. According to a fifth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the first aspect to the fourth aspect is configured such that the at least one sprocket includes at least ten sprocket wheels. In the case of the bicycle rear sprocket assembly according to the fifth aspect, at least ten sprocket wheels realize a wide range of the bicycle rear sprocket. According to a sixth aspect of the present invention, the bicycle rear sprocket assembly according to any one of the first aspect to the fourth aspect is configured such that the at least one sprocket includes at least eleven sprocket wheels. In the case of the bicycle rear sprocket assembly according to the sixth aspect, at least eleven sprocket wheels realize a wider range of bicycle rear sprocket wheels. According to a seventh aspect of the present invention, the bicycle rear sprocket assembly of any one of the first to fourth aspects is configured such that the at least one sprocket includes at least twelve sprocket wheels. In the case of the bicycle rear sprocket assembly according to the seventh aspect, at least twelve sprocket wheels realize a wider range of bicycle rear sprocket wheels. According to an eighth aspect of the present invention, the rear sprocket assembly of a bicycle as in any one of the first aspect to the seventh aspect is configured such that the at least one sprocket includes a plurality of sprockets and the configuration is At least one internal spline tooth meshing with a bicycle hub assembly. The plurality of sprocket wheels include one of the largest sprocket wheels having a tooth tip diameter. The at least one internal spline tooth has an internal spline base diameter. The ratio of the bottom spline diameter to the tooth tip diameter is in the range of 0.1 to 0.2. In the case of the bicycle rear sprocket assembly according to the eighth aspect, the ratio realizes a wide range of the bicycle rear sprocket assembly while improving the durability of at least one sprocket. According to a ninth aspect of the present invention, the bicycle rear sprocket assembly according to any one of the first aspect to the eighth aspect is configured so that the at least one sprocket includes a first sprocket and a second Sprocket. The first sprocket has a first total number of teeth. The second sprocket has a second total number of teeth that is less than one of the first total number of teeth. The first sprocket includes at least one first shift promotion region to facilitate a first shift operation of shifting a bicycle chain from the second sprocket to one of the first sprockets, and includes at least one second shift promotion A region to facilitate a second shift operation of shifting the bicycle chain from the first sprocket to one of the second sprocket. In the case of the bicycle rear sprocket assembly according to the ninth aspect, the at least one first shift promotion region and the at least one second shift promotion region make the first shift operation and the second shift operation smoother. According to a tenth aspect of the present invention, the bicycle rear sprocket assembly according to any one of the first aspect to the ninth aspect further includes a locking member configured to prevent installation on a bicycle hub assembly. An axial movement of the at least one sprocket relative to a center axis of rotation of the bicycle rear sprocket assembly. The locking member includes a tubular body portion and a protruding portion. The tubular body portion has a central axis. The protruding portion extends radially outward from the tubular body portion with respect to the central axis of the tubular body portion. The tubular body portion has an externally threaded portion configured to engage an internally threaded portion of one of the bicycle hub assemblies. The protruding portion is configured to abut the at least one sprocket. In the case of the bicycle rear sprocket assembly according to the tenth aspect, it is possible to attach the bicycle rear sprocket assembly to the bicycle hub assembly to prevent axial movement of at least one sprocket relative to the bicycle hub assembly. According to an eleventh aspect of the present invention, the bicycle rear sprocket assembly of the tenth aspect is configured so that the tubular body portion has a first outer diameter equal to or smaller than 26 mm. In the case of the bicycle rear sprocket assembly according to the eleventh aspect, the first outer diameter achieves a wide range of the bicycle rear sprocket assembly, and at the same time prevents at least one sprocket from moving axially relative to the bicycle hub assembly. According to a twelfth aspect of the present invention, the bicycle rear sprocket assembly according to the eleventh aspect is configured so that the first outer diameter is equal to or greater than 25 mm. In the case of the bicycle rear sprocket assembly according to the twelfth aspect, the first outer diameter ensures the strength of the locking member, while achieving a wide range of the bicycle rear sprocket assembly. According to a thirteenth aspect of the present invention, the bicycle rear sprocket assembly according to any one of the tenth aspect to the twelfth aspect is configured so that the protruding portion has a second equal to or less than 32 mm Outer diameter. In the case of the bicycle rear sprocket assembly according to the thirteenth aspect, the second outer diameter achieves a wide range of the bicycle rear sprocket assembly, while preventing at least one sprocket from moving axially relative to the bicycle hub assembly. According to a fourteenth aspect of the present invention, the bicycle rear sprocket assembly according to the thirteenth aspect is configured so that the second outer diameter is equal to or greater than 30 mm. In the case of the bicycle rear sprocket assembly according to the fourteenth aspect, the second outer diameter ensures the strength of the locking member, while achieving a wide range of the bicycle rear sprocket assembly. According to a fifteenth aspect of the present invention, the bicycle rear sprocket assembly according to any one of the tenth aspect to the fourteenth aspect is configured so that the locking member has a tool engaging portion. In the case of the bicycle rear sprocket assembly according to the fifteenth aspect, it is possible to easily attach the lock member to the bicycle hub assembly and to easily disengage the lock member from the bicycle hub assembly. According to a sixteenth aspect of the present invention, the bicycle rear sprocket assembly according to any one of the first aspect to the fifteenth aspect further includes a sprocket support. The at least one sprocket includes a plurality of sprocket wheels attached to the sprocket support. In the case of the bicycle rear sprocket assembly according to the sixteenth aspect, it is possible to reduce the weight of the bicycle rear sprocket assembly. According to a seventeenth aspect of the present invention, the bicycle rear sprocket assembly of the sixteenth aspect is configured such that the plurality of sprocket wheels are attached to the sprocket support by an adhesive. In the case of the bicycle rear sprocket assembly according to the seventeenth aspect, it is possible to reduce or remove metal fasteners. This effectively reduces the weight of the rear sprocket assembly of the bicycle. According to an eighteenth aspect of the present invention, the bicycle rear sprocket assembly such as the sixteenth aspect or the seventeenth aspect is configured so that the sprocket support is made of a non-metallic material including a resin material. to make. In the case of the bicycle rear sprocket assembly according to the eighteenth aspect, the non-metallic material can effectively reduce the weight of the bicycle rear sprocket assembly. According to a nineteenth aspect of the present invention, the bicycle rear sprocket assembly according to any one of the first aspect to the eighteenth aspect further includes a rear hub abutment surface, the rear hub abutment surface is configured to When the bicycle rear sprocket assembly is mounted to a bicycle hub assembly, the bicycle rear sprocket assembly abuts the bicycle hub assembly in an axial direction relative to a rotation center axis of the bicycle rear sprocket assembly. The at least one sprocket includes a plurality of sprocket wheels, and the plurality of sprocket wheels includes a largest sprocket wheel. The largest sprocket has an axial inner surface and an axial outer surface disposed on an opposite side of the axial inner surface in the axial direction. The axial outer surface is closer to the rear hub abutting surface in the axial direction than the axial inner surface. An axial distance defined between the axial inner surface and the abutting surface of the rear hub in the axial direction is equal to or greater than 7 mm. In the case of the bicycle rear sprocket assembly according to the nineteenth aspect, the axial distance achieves a wide range of the bicycle rear sprocket. According to a twentieth aspect of the present invention, the bicycle rear sprocket assembly of the nineteenth aspect is configured such that the axial distance is equal to or greater than 10 mm. In the case of the bicycle rear sprocket assembly according to the twentieth aspect, the axial distance further realizes a wider range of the bicycle rear sprocket. According to a twenty-first aspect of the present invention, a bicycle rear sprocket assembly includes at least one sprocket, and the at least one sprocket has a total number of teeth equal to or greater than 15. The at least one sprocket includes at least one internal spline tooth configured to mesh with a bicycle hub assembly. The at least one internal spline tooth has an internal spline base diameter equal to or less than 30 mm. In the case of the bicycle rear sprocket assembly according to the twenty-first aspect, it is possible to manufacture a bicycle rear sprocket having a total number of teeth equal to or less than 10. Therefore, it is possible to widen the gear range of the bicycle rear sprocket assembly on the high-speed gear side. The twenty-first aspect may be combined with any one of the first to twentieth aspects. According to the twenty-second aspect of the present invention, the bicycle rear sprocket assembly according to the twenty-first aspect is configured so that the bottom diameter of the internal spline is equal to or greater than 25 mm. In the case of the bicycle rear sprocket assembly according to the twenty-second aspect, it is possible to ensure the strength of at least one sprocket while widening the gear range of the bicycle rear sprocket assembly on the high-speed gear side. According to the twenty-third aspect of the present invention, the bicycle rear sprocket assembly according to the twenty-first aspect is configured so that the bottom diameter of the internal spline is equal to or greater than 29 mm. In the case of the bicycle rear sprocket assembly according to the twenty-third aspect, it is possible to further ensure the strength of at least one sprocket while widening the gear range of the bicycle rear sprocket assembly on the high-speed gear side. According to the twenty-fourth aspect of the present invention, the bicycle rear sprocket assembly of any one of the twenty-first aspect to the twenty-third aspect is configured such that the at least one internal spline tooth has an Or one of the inner spline tip diameters smaller than 28 mm. In the case of the bicycle rear sprocket assembly according to the twenty-fourth aspect, the internal spline top diameter can increase the radial length of the transmission surface of the at least one internal spline tooth. This improves the strength of at least one sprocket. According to the twenty-fifth aspect of the present invention, the bicycle rear sprocket assembly as in the twenty-fourth aspect is configured so that the inner spline top diameter is equal to or greater than 25 mm. In the case of the bicycle rear sprocket assembly according to the twenty-fifth aspect, it is possible to ensure the strength of at least one sprocket while widening the gear range of the bicycle rear sprocket assembly on the high-speed gear side. According to the twenty-sixth aspect of the present invention, the bicycle rear sprocket assembly such as the twenty-fourth aspect or the twenty-fifth aspect is configured so that the inner spline top diameter is equal to or greater than 27 mm. In the case of the bicycle rear sprocket assembly according to the twenty-sixth aspect, it is possible to surely ensure the strength of at least one sprocket while widening the gear range of the bicycle rear sprocket assembly on the high speed gear side. According to a twenty-seventh aspect of the present invention, the bicycle rear sprocket assembly of any one of the twenty-first aspect to the twenty-sixth aspect is configured such that the at least one internal spline tooth includes a plurality Internal spline teeth, the plurality of internal spline teeth including a plurality of internal spline drive surfaces for receiving a driving rotational force from the bicycle hub assembly during pedaling. Each of the plurality of internal 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. The sum of one of these radial lengths is equal to or greater than 7 mm. In the case of the bicycle rear sprocket assembly according to the twenty-seventh aspect, it is possible to increase the radial length of the plurality of internal spline drive surfaces. This improves the strength of at least one sprocket. According to the twenty-eighth aspect of the present invention, the bicycle rear sprocket assembly of the twenty-seventh aspect is configured such that the total of the radial lengths is equal to or greater than 10 mm. In the case of the bicycle rear sprocket assembly according to the twenty-eighth aspect, it is possible to further increase the radial length of the plurality of internal spline drive surfaces. This improves the strength of at least one sprocket. According to a twenty-ninth aspect of the present invention, the bicycle rear sprocket assembly of the twenty-seventh aspect is configured so that the sum of the radial lengths is equal to or greater than 15 mm. In the case of the bicycle rear sprocket assembly according to the twenty-ninth aspect, it is possible to further increase the radial length of the plurality of external spline drive surfaces. This further improves the strength of at least one sprocket. According to a thirty aspect of the present invention, the bicycle rear sprocket assembly of any one of the twenty-first aspect to the twenty-ninth aspect is configured such that the at least one sprocket includes at least ten chains wheel. In the case of the bicycle rear sprocket assembly according to the thirtieth aspect, at least ten sprocket wheels realize a wide range of the bicycle rear sprocket assembly. According to the thirty-first aspect of the present invention, the bicycle rear sprocket assembly of any one of the twenty-first aspect to the twenty-ninth aspect is configured such that the at least one sprocket includes at least eleven Sprocket wheels. In the case of the bicycle rear sprocket assembly according to the thirty-first aspect, at least eleven sprocket wheels realize a wide range of the bicycle rear sprocket assembly. According to the thirty-second aspect of the present invention, the bicycle rear sprocket assembly of any one of the twenty-first aspect to the twenty-ninth aspect is configured such that the at least one sprocket includes at least twelve. Sprocket wheels. In the case of the bicycle rear sprocket assembly according to the thirty-second aspect, at least twelve sprocket wheels realize a wide range of the bicycle rear sprocket assembly. According to the thirty-third aspect of the present invention, the bicycle rear sprocket assembly according to any one of the twenty-first aspect to the thirty-second aspect is configured so that the at least one sprocket includes a plurality of chains wheel. The plurality of sprocket wheels include one of the largest sprocket wheels having a tooth tip diameter. The ratio of the bottom spline diameter to the tooth tip diameter is in the range of 0.1 to 0.2. In the case of the bicycle rear sprocket assembly according to the thirty-third aspect, the ratio realizes a wide range of the bicycle rear sprocket assembly while improving the durability of at least one sprocket. According to the thirty-fourth aspect of the present invention, the bicycle rear sprocket assembly according to any one of the twenty-first aspect to the thirty-second aspect is configured so that the at least one sprocket includes a first A sprocket and a second sprocket. The first sprocket has a first total number of teeth. The second sprocket has a second total number of teeth that is less than one of the first total number of teeth. The first sprocket includes at least one first shift promotion region to facilitate a first shift operation of shifting a bicycle chain from the second sprocket to one of the first sprockets, and includes at least one second shift promotion A region to facilitate a second shift operation of shifting the bicycle chain from the first sprocket to one of the second sprocket. In the case of the bicycle rear sprocket assembly according to the thirty-fourth aspect, at least one first shift promotion area and at least one second shift promotion area make the first shift operation and the second shift operation smoother. . According to a thirty-fifth aspect of the present invention, the bicycle rear sprocket assembly according to any one of the twenty-first aspect to the thirty-fourth aspect further includes a locking member configured to prevent An axial movement of the at least one sprocket mounted on a bicycle hub assembly relative to a rotation center axis of the bicycle rear sprocket assembly. The locking member includes a tubular body portion and a protruding portion. The tubular body portion has a central axis. The protruding portion extends radially outward from the tubular body portion with respect to the central axis of the tubular body portion. The tubular body portion has an externally threaded portion configured to engage an internally threaded portion of one of the bicycle hub assemblies. The protruding portion is configured to abut the at least one sprocket. In the case of the bicycle rear sprocket assembly according to the thirty-fifth aspect, it is possible to attach the bicycle rear sprocket assembly to the bicycle hub assembly to prevent axial movement of at least one sprocket relative to the bicycle hub assembly . According to a thirty-sixth aspect of the present invention, the bicycle rear sprocket assembly of the thirty-fifth aspect is configured so that the tubular body portion has a first outer diameter equal to or smaller than 26 mm. In the case of the bicycle rear sprocket assembly according to the thirty-sixth aspect, the first outer diameter achieves a wide range of the bicycle rear sprocket assembly, while preventing axial movement of at least one sprocket relative to the bicycle hub assembly . According to a thirty-seventh aspect of the present invention, the bicycle rear sprocket assembly according to the thirty-sixth aspect is configured so that the first outer diameter is equal to or greater than 25 mm. In the case of the bicycle rear sprocket assembly according to the thirty-seventh aspect, the first outer diameter ensures the strength of the locking member, while achieving a wide range of the bicycle rear sprocket assembly. According to the thirty-eighth aspect of the present invention, the bicycle rear sprocket assembly according to any one of the thirty-fifth aspect to the thirty-seventh aspect is configured so that the protruding portion has a diameter of 32 mm or less One of the second outer diameter. In the case of the bicycle rear sprocket assembly according to the thirty-eighth aspect, the second outer diameter achieves a wide range of the bicycle rear sprocket assembly while preventing at least one sprocket from moving axially relative to the bicycle hub assembly. According to a thirty-ninth aspect of the present invention, the bicycle rear sprocket assembly according to the thirty-eighth aspect is configured so that the second outer diameter is equal to or greater than 30 mm. In the case of the bicycle rear sprocket assembly according to the thirty-ninth aspect, the second outer diameter ensures the strength of the locking member, while achieving a wide range of the bicycle rear sprocket assembly. According to the fortieth aspect of the present invention, the bicycle rear sprocket assembly according to any one of the thirty-fifth aspect to the thirty-ninth aspect is configured so that the locking member has a tool engaging portion. In the case of the bicycle rear sprocket assembly according to the fortieth aspect, it is possible to easily attach the lock member to the bicycle hub assembly and to easily disengage the lock member from the bicycle hub assembly. According to the forty-first aspect of the present invention, the bicycle rear sprocket assembly according to any one of the twenty-first aspect to the fortieth aspect further includes a sprocket support. The at least one sprocket includes a plurality of sprocket wheels attached to the sprocket support. In the case of the bicycle rear sprocket assembly according to the forty-first aspect, it is possible to reduce the weight of the bicycle rear sprocket assembly. According to the forty-second aspect of the present invention, the bicycle rear sprocket assembly as in the forty-first aspect is configured so that the plurality of sprocket wheels are attached to the sprocket support by an adhesive. In the case of the bicycle rear sprocket assembly according to the forty-second aspect, it is possible to reduce or remove metal fasteners. This effectively reduces the weight of the rear sprocket assembly of the bicycle. According to the forty-third aspect of the present invention, the bicycle rear sprocket assembly such as the forty-first aspect or the forty-second aspect is configured so that the sprocket support is made of a resin material and Made of metal material. In the case of the bicycle rear sprocket assembly according to the forty-third aspect, the non-metallic material can effectively reduce the weight of the bicycle rear sprocket assembly. According to the forty-fourth aspect of the present invention, the bicycle rear sprocket assembly according to any one of the twenty-first aspect to the forty-third aspect further includes a rear hub abutting surface, the rear hub abutting surface It is configured to abut the bicycle hub assembly in an axial direction relative to a rotation center axis of the bicycle rear sprocket assembly in a state where the bicycle rear sprocket assembly is mounted to a bicycle hub assembly. The at least one sprocket includes a plurality of sprocket wheels, and the plurality of sprocket wheels includes a largest sprocket wheel. The largest sprocket has an axial inner surface and an axial outer surface disposed on an opposite side of the axial inner surface in the axial direction. The axial outer surface is closer to the rear hub abutting surface in the axial direction than the axial inner surface. An axial distance defined between the axial inner surface and the abutting surface of the rear hub in the axial direction is equal to or greater than 7 mm. In the case of the bicycle rear sprocket assembly according to the forty-fourth aspect, the axial distance achieves a wide range of the bicycle rear sprocket. According to a forty-fifth aspect of the present invention, the bicycle rear sprocket assembly is configured such that the axial distance is equal to or greater than 10 mm. In the case of the bicycle rear sprocket assembly according to the forty-fifth aspect, the axial distance further realizes a wider range of the bicycle rear sprocket. According to a forty-sixth aspect of the present invention, a bicycle rear sprocket assembly includes a plurality of sprocket wheels, an abutment surface of a rear hub, and an axial distance. The plurality of sprocket wheels include a largest sprocket wheel. The largest sprocket has an axial inner surface and an axial outer portion disposed on an opposite side of the axial inner surface in an axial direction relative to a rotation center axis of the bicycle rear sprocket assembly. surface. The rear hub abutment surface is configured to abut the bicycle hub assembly in the axial direction in a state where the bicycle rear sprocket assembly is mounted to a bicycle hub assembly, compared to the axial inner surface, The axial outer surface is closer to the rear hub abutting surface in the axial direction. The axial distance defined between the axial inner surface and the abutting surface of the rear hub in the axial direction is equal to or greater than 7 mm. In the case of the bicycle rear sprocket assembly according to the forty-sixth aspect, the axial distance achieves a wide range of the bicycle rear sprocket. According to a forty-seventh aspect of the present invention, the bicycle rear sprocket assembly of the forty-sixth aspect is configured so that the axial distance is equal to or greater than 10 mm. In the case of the bicycle rear sprocket assembly according to the forty-seventh aspect, the axial distance further realizes a wider range of the bicycle rear sprocket. According to the forty-eighth aspect of the present invention, the bicycle rear sprocket assembly such as the forty-sixth aspect or the forty-seventh aspect is configured so that the bicycle rear sprocket assembly is mounted to the bicycle hub. In one state of the assembly, the axial inner surface is positioned closer to an axial center plane of the bicycle hub assembly than the rear hub abutting surface. In the case of the bicycle rear sprocket assembly according to the forty-eighth aspect, the axial distance achieves a wider range of the bicycle rear sprocket. According to the forty-ninth aspect of the present invention, the bicycle rear sprocket assembly according to any one of the forty-sixth aspect to the forty-eighth aspect is configured so that the total number of one of the plurality of sprocket wheels is Is 12. In the case of the bicycle rear sprocket assembly according to the forty-ninth aspect, the total number of the plurality of sprocket wheels achieves a wide range of the bicycle rear sprocket. According to the fiftieth aspect of the present invention, the bicycle rear sprocket assembly of any one of the forty-sixth aspect to the forty-ninth aspect is configured so that the total number of teeth of one of the largest sprocket is equal to or Greater than 39. In the case of the bicycle rear sprocket assembly according to the fiftieth aspect, the total number of teeth of the maximum sprocket achieves a wide range of bicycle rear sprocket. According to the fifty-first aspect of the present invention, the bicycle rear sprocket assembly according to any one of the forty-sixth aspect to the forty-ninth aspect is configured so that the total number of teeth of one of the largest sprocket equals Or greater than 45. In the case of the bicycle rear sprocket assembly according to the fifty-first aspect, the total number of teeth of the maximum sprocket achieves a wide range of bicycle rear sprocket.

本申請案為2017年5月30日申請之美國專利申請案第15/608,924號之部分接續申請案。該申請案之內容以全文引用之方式併入本文中。 現將參看附圖描述實施例，其中相似參考數字指定在各種圖式中之對應或相同元件。 首先參考圖1，根據一實施例之自行車傳動系統10包含自行車輪轂總成12及自行車後鏈輪總成14。自行車輪轂總成12緊固至自行車框架BF。自行車後鏈輪總成14安裝於自行車輪轂總成12上。自行車制動轉子16安裝於自行車輪轂總成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傳輸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及圖3中所見，自行車輪轂總成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之間傳輸傳動旋轉力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，自行車輪轂總成12包含鏈輪支撐主體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之間傳輸傳動旋轉力F1。自行車輪轂總成12進一步包含輪轂軸30。鏈輪支撐主體28圍繞旋轉中心軸線A1可旋轉地安裝於輪轂軸30上。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以在平行於旋轉中心軸線A1之軸向方向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4中所見，自行車輪轂總成12藉由車輪緊固結構WS緊固至自行車框架BF。輪轂軸30具有通孔30A。車輪緊固結構WS之緊固桿WS1延伸穿過輪轂軸30之通孔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包括在所申請之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。 如圖4及圖5中所見，自行車輪轂總成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傳輸至制動轉子支撐主體34。 如圖5中所見，自行車輪轂總成12進一步包含輪轂主體36。輪轂主體36圍繞旋轉中心軸線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為來自輪轂主體36之單獨構件。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可為來自輪轂主體36之單獨構件。 輪轂主體36包括第一凸緣36A及第二凸緣36B。第一輪輻(未展示)耦接至第一凸緣36A。第二輪輻(未展示)耦接至第二凸緣36B。第二凸緣36B在軸向方向D2上與第一凸緣36A間隔開。第一凸緣36A在軸向方向D2上設置於鏈輪支撐主體28與第二凸緣36B之間。第二凸緣36B在軸向方向D2上設置於第一凸緣36A與制動轉子支撐主體34之間。 鎖定構件32包括外部帶螺紋部分32A。鏈輪支撐主體28包括內部帶螺紋部分28A。在鎖定構件32緊固至鏈輪支撐主體28之狀態中，外部帶螺紋部分32A與內部帶螺紋部分28A螺紋嚙合。 如圖6中所見，鎖定構件32經構形以阻止安裝於自行車輪轂總成12上之至少一個鏈輪相對於自行車後鏈輪總成14之旋轉中心軸線A1軸向移動。如圖5中所見，鎖定構件32包括管狀主體部分32C及突出部分32B。管狀主體部分32C具有中心軸線A2。突出部分32B相對於管狀主體部分32C之中心軸線A2自管狀主體部分32C徑向向外延伸。管狀主體部分32C具有經構形以與自行車輪轂總成12之內部帶螺紋部分28A嚙合的外部帶螺紋部分32A。 如圖6中所見，突出部分32B經構形以鄰接至少一個鏈輪。在此實施例中，突出部分32B經構形以鄰接鏈輪SP1。管狀主體部分32C具有等於或小於26 mm之第一外徑ED1。第一外徑ED1等於或大於25 mm。在此實施例中，第一外徑ED1為25.45 mm。然而，第一外徑ED1不限於此實施例及以上範圍。突出部分32B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，第二外徑ED2為31.5 mm。然而，第二外徑ED2不限於此實施例及以上範圍。 如圖5中所見，鎖定構件32具有工具嚙合部分32D。工具嚙合部分32D設置於管狀主體部分32C之內周邊表面32C1上以與工具嚙合。工具嚙合部分32D包括設置於管狀主體部分32C之內周邊表面32C1上的複數個工具嚙合凹槽32D1。然而，工具嚙合部分32D之結構不限於此實施例。在所說明之實施例中，工具嚙合部分32D可自鎖定構件32省略，或可具有不同於工具嚙合部分32D之另一形狀。 如圖6中所見，自行車輪轂總成12進一步包含棘輪結構38。鏈輪支撐主體28藉由棘輪結構38可操作地耦接至輪轂主體36。棘輪結構38經構形以將鏈輪支撐主體28耦接至輪轂主體36，從而在踩踏期間使鏈輪支撐主體28連同輪轂主體36在傳動旋轉方向D11 (圖5)上旋轉。棘輪結構38經構形以允許鏈輪支撐主體28在惰轉期間在反向旋轉方向D12 (圖5)上相對於輪轂主體36旋轉。因此，棘輪結構38可解釋為單向聯軸結構38。棘輪結構38包括自行車領域中已知的結構。因此，出於簡潔起見，此處將不作詳細描述。 自行車輪轂總成12包括第一軸承39A及第二軸承39B。第一軸承39A及第二軸承39B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7及圖8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)嚙合之複數個外部花鍵齒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包括經構形以與自行車後鏈輪總成14 (圖6)嚙合之至少九個外部花鍵齒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。 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之突出部分32B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，可自自行車輪轂總成12省略較大直徑部分42。 如圖9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之總數目等於或大於25。在此實施例中，至少十個外部花鍵齒40之總數目為26。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。複數個外部花鍵齒40中之至少兩個外部花鍵齒相對於自行車輪轂總成12之旋轉中心軸線A1以第一外部周節角PA11沿圓周配置。複數個外部花鍵齒40中之至少兩個外部花鍵齒相對於自行車輪轂總成12之旋轉中心軸線A1以第二外部周節角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可實質上等於第一外部周節角PA11。 在此實施例中，外部花鍵齒40係在圓周方向D1上以第一外部周節角PA11配置。外部花鍵齒40中之兩個外部花鍵齒係在圓周方向D1上以第二外部周節角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在10度至20度之範圍內。第一外部周節角PA11在12度至15度之範圍內。第一外部周節角PA11在13度至14度之範圍內。在此實施例中，第一外部周節角PA11為13.3度。然而，第一外部周節角PA11不限於此實施例及以上範圍。 第二部周節角PA12在5度至30度之範圍內。在此實施例中，第二外部周節角PA12為26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具有實質上彼此相同的形狀。外部花鍵齒40具有實質上彼此相同的花鍵大小。當沿旋轉中心軸線A1檢視時，外部花鍵齒40具有實質上彼此相同的輪廓。然而，如圖10中所見，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，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中之另一者之輪廓的輪廓。在圖10中，外部花鍵齒40中之一者具有不同於外部花鍵齒40中之其他齒之花鍵形狀的花鍵形狀。外部花鍵齒40中之一者具有不同於外部花鍵齒40中之其他齒之花鍵大小的花鍵大小。當沿旋轉中心軸線A1檢視時，外部花鍵齒40中之一者具有不同於外部花鍵齒40中之其他齒之輪廓的輪廓。 如圖11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。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。 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與外部花鍵非傳動表面50在參考點50R處相交。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。參考點50R設置於徑向最外邊緣50A與徑向最內邊緣50B之間。然而，參考點50R可與徑向最內邊緣50B重合。 圓周最大寬度MW1之總和等於或大於55 mm。圓周最大寬度MW1之總和等於或大於60 mm。圓周最大寬度MW1之總和等於或大於65 mm。在此實施例中，圓周最大寬度MW1之總和為68 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12中所見，至少一個外部花鍵齒40具有外部花鍵頂徑DM11。外部花鍵頂徑DM11等於或大於25 mm。外部花鍵頂徑DM11等於或大於29 mm。外部花鍵頂徑DM11等於或小於30 mm。在此實施例中，外部花鍵頂徑DM11為29.6 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28 mm。外部花鍵底徑DM12等於或大於25 mm。外部花鍵底徑DM12等於或大於27 mm。在此實施例中，外部花鍵底徑DM12為27.2 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在32 mm至40 mm之範圍內。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11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之總和等於或大於7 mm。徑向長度RL11之總和等於或大於10 mm。徑向長度RL11之總和等於或大於15 mm。在此實施例中，徑向長度RL11之總和為19.5 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具有徑向長度RL12。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。徑向長度RL12之總和等於或大於12 mm。在此實施例中，徑向長度RL12之總和為31.85 mm。然而，徑向長度RL12之總和不限於此實施例。 至少九個外部花鍵齒40中之至少一者相對於圓周齒尖中心線CL1具有不對稱形狀。圓周齒尖中心線CL1為連接旋轉中心軸線A1與外部花鍵齒40之徑向最外端40A之圓周中心點CP1的線。然而，外部花鍵齒40中之至少一者可相對於圓周齒尖中心線CL1具有對稱形狀。至少九個外部花鍵齒40中之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。 外部花鍵傳動表面48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界定於相鄰第一徑向線L11 (參見例如圖9)之間。 外部花鍵非傳動表面50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不同於第一外部花鍵表面角AG11。第一外部花鍵表面角AG11小於第二外部花鍵表面角AG12。然而，第一外部花鍵表面角AG11可等於或大於第二外部花鍵表面角AG12。 第一外部花鍵表面角AG11在0度至10度之範圍內。第二外部花鍵表面角AG12在0度至60度之範圍內。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45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13及圖14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4)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14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15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實質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16中所見，輪轂軸30包括用以接觸自行車框架BF之軸向接觸表面30B1。在此實施例中，軸向接觸表面30B1可與自行車框架BF之第一框架BF1接觸。第一框架BF1包括框架接觸表面BF12。在自行車輪轂總成12藉由車輪緊固結構WS緊固至自行車框架BF之狀態中，軸向接觸表面30B1與框架接觸表面BF12接觸。 第一軸向長度AL11係相對於旋轉中心軸線A1在軸向方向D2上自軸向接觸表面30B1至較大直徑部分42界定。第一軸向長度AL11在35 mm至41 mm之範圍內。第一軸向長度AL11可等於或大於39 mm。第一軸向長度AL11亦可在35 mm至37 mm之範圍內。在此實施例中，第一軸向長度AL11為36.2 mm。然而，第一軸向長度AL11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上離軸向接觸表面30B1最遠的軸向端42A。第二軸向長度AL12係在軸向方向D2上自軸向接觸表面30B1至軸向端42A界定。第二軸向長度AL12在38 mm至47 mm之範圍內。第二軸向長度AL12可在44 mm至45 mm之範圍內。第二軸向長度AL12亦可在40 mm至41 mm之範圍內。在此實施例中，第二軸向長度AL12為40.75 mm。然而，第二軸向長度AL12不限於此實施例及以上範圍。 較大直徑部分42之軸向長度AL13在3 mm至6 mm之範圍內。在此實施例中，軸向長度AL13為4.55 mm。然而，軸向長度AL13不限於此實施例及以上範圍。 如圖17中所見，自行車後鏈輪總成14包含至少一個鏈輪。至少一個鏈輪包括複數個鏈輪。至少一個鏈輪包括至少十個鏈輪。至少一個鏈輪包括至少十一個鏈輪。至少一個鏈輪包括至少十二個鏈輪。複數個鏈輪包括最大鏈輪SP12。最大鏈輪SP12具有齒尖直徑TD1。複數個鏈輪亦包括最小鏈輪SP1。最小鏈輪SP1亦可被稱作鏈輪SP1。最大鏈輪SP12亦可被稱作鏈輪SP12。在此實施例中，至少一個鏈輪進一步包括鏈輪SP2至SP11。鏈輪SP1對應於高速齒輪。鏈輪SP12對應於低速齒輪。在此實施例中，複數個鏈輪之總數目為12。然而，自行車後鏈輪總成14之鏈輪之總數目不限於此實施例。 最小鏈輪SP1包括至少一個鏈輪齒SP1B。最小鏈輪SP1之至少一個鏈輪齒SP1B之總數目等於或小於10。在此實施例中，最小鏈輪SP1之至少一個鏈輪齒SP1B之總數目為10。然而，最小鏈輪SP1之至少一個鏈輪齒SP1B之總數目不限於此實施例及以上範圍。 最大鏈輪SP12包括至少一個鏈輪齒SP12B。最大鏈輪SP12之總齒數等於或大於39。最大鏈輪SP12之總齒數等於或大於45。最大鏈輪SP12之至少一個鏈輪齒SP12B之總數目等於或大於46。最大鏈輪SP12之至少一個鏈輪齒SP12B之總數目等於或大於50。在此實施例中，最大鏈輪SP12之至少一個鏈輪齒SP12B之總數目為51。然而，最大鏈輪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。齒尖直徑TD1為由鏈輪齒SP12B之齒尖界定之圓的直徑。 鏈輪SP2包括至少一個鏈輪齒SP2B。鏈輪SP3包括至少一個鏈輪齒SP3B。鏈輪SP4包括至少一個鏈輪齒SP4B。鏈輪SP5包括至少一個鏈輪齒SP5B。鏈輪SP6包括至少一個鏈輪齒SP6B。鏈輪SP7包括至少一個鏈輪齒SP7B。鏈輪SP8包括至少一個鏈輪齒SP8B。鏈輪SP9包括至少一個鏈輪齒SP9B。鏈輪SP10包括至少一個鏈輪齒SP10B。鏈輪SP11包括至少一個鏈輪齒SP11B。 至少一個鏈輪齒SP2B之總數目為12。至少一個鏈輪齒SP3B之總數目為14。至少一個鏈輪齒SP4B之總數目為16。至少一個鏈輪齒SP5B之總數目為18。至少一個鏈輪齒SP6B之總數目為21。至少一個鏈輪齒SP7B之總數目為24。至少一個鏈輪齒SP8B之總數目為28。至少一個鏈輪齒SP9B之總數目為33。至少一個鏈輪齒SP10B之總數目為39。至少一個鏈輪齒SP11B之總數目為45。至少一個鏈輪具有等於或大於15之總齒數。舉例而言，鏈輪SP4之總齒數為16。鏈輪SP5之總齒數為18。鏈輪SP6之總齒數為21。鏈輪SP7之總齒數為24。鏈輪SP8之總齒數為28。鏈輪SP9之總齒數為33。鏈輪SP10之總齒數為39。鏈輪SP11之總齒數為45。鏈輪SP12之總齒數為51。鏈輪SP2至SP11中之每一者之鏈輪齒的總數目不限於此實施例。鏈輪SP1至SP12中之至少一者可包括等於或大於15之總齒數。 如圖18中所見，鏈輪SP1至SP12為彼此分開的構件。然而，鏈輪SP1至SP12中之至少一者可至少部分地與鏈輪SP1至SP12中之另一者一體地提供。自行車後鏈輪總成14進一步包含鏈輪支撐件56、複數個間隔件58、第一環59A及第二環59B。在所說明之實施例中，複數個鏈輪SP1至SP12附接至鏈輪支撐件56。舉例而言，複數個鏈輪SP1至SP12藉由黏附劑附接至鏈輪支撐件56。 如圖19中所見，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自鏈輪主體SP1A徑向向外延伸。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自鏈輪主體SP2A徑向向外延伸。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自鏈輪主體SP3A徑向向外延伸。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自鏈輪主體SP4A徑向向外延伸。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自鏈輪主體SP5A徑向向外延伸。第一環59A設置於鏈輪SP3與鏈輪SP4之間。第二環59B設置於鏈輪SP4與鏈輪SP5之間。 如圖20中所見，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自鏈輪主體SP6A徑向向外延伸。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自鏈輪主體SP7A徑向向外延伸。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自鏈輪主體SP8A徑向向外延伸。 如圖21中所見，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自鏈輪主體SP9A徑向向外延伸。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自鏈輪主體SP10A徑向向外延伸。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自鏈輪主體SP11A徑向向外延伸。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自鏈輪主體SP12A徑向向外延伸。 如圖22中所見，鏈輪支撐件56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58包括複數個第一間隔件58A、複數個第二間隔件58B、複數個第三間隔件58C、複數個第四間隔件58D、複數個第五間隔件58E、複數個第六間隔件58F及複數個第七間隔件58G。 如圖23中所見，第一間隔件58A設置於鏈輪SP5與鏈輪SP6之間。第二間隔件58B設置於鏈輪SP6與鏈輪SP7之間。第三間隔件58C設置於鏈輪SP7與鏈輪SP8之間。第四間隔件58D設置於鏈輪SP8與鏈輪SP9之間。第五間隔件58E設置於鏈輪SP9與鏈輪SP10之間。第六間隔件58F設置於鏈輪SP10與鏈輪SP11之間。第七間隔件58G設置於鏈輪SP11與鏈輪SP12之間。 鏈輪SP6及第一間隔件58A藉由諸如黏附劑之黏合結構附接至第一附接部分62A。鏈輪SP7及第二間隔件58B藉由諸如黏附劑之黏合結構附接至第二附接部分62B。鏈輪SP8及第三間隔件58C藉由諸如黏附劑之黏合結構附接至第三附接部分62C。鏈輪SP9及第四間隔件58D藉由諸如黏附劑之黏合結構附接至第四附接部分62D。鏈輪SP10及第五間隔件58E藉由諸如黏附劑之黏合結構附接至第五附接部分62E。鏈輪SP11及第六間隔件58F藉由諸如黏附劑之黏合結構附接至第六附接部分62F。鏈輪SP12及第七間隔件58G藉由諸如黏附劑之黏合結構附接至第七附接部分62G。鏈輪SP5及第二環59B藉由諸如黏附劑之黏合結構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59A及第二環59B在軸向方向D2上固持於較大直徑部分42與鎖定構件32之突出部分32B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。鏈輪支撐件56、第一間隔件58A至第七間隔件58G、第一環59A及第二環59B中之每一者由諸如樹脂材料之非金屬材料製成。鏈輪支撐件56由包括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。鏈輪支撐件56、第一間隔件58A至第七間隔件58G、第一環59A及第二環59B中之至少一者可至少部分地由諸如鋁、鐵或鈦之金屬材料製成。 至少一個鏈輪包括經構形以與自行車輪轂總成12嚙合之至少一個內部花鍵齒。如圖24及圖25中所見，至少一個鏈輪包括經構形以與自行車輪轂總成12嚙合之至少十個內部花鍵齒。至少一個內部花鍵齒包括複數個內部花鍵齒。因此，至少一個鏈輪包括經構形以與自行車輪轂總成12嚙合之複數個內部花鍵齒。在此實施例中，鏈輪SP1包括經構形以與自行車輪轂總成12嚙合之至少十個內部花鍵齒64。在此實施例中，鏈輪SP1包括經構形以與自行車輪轂總成12之鏈輪支撐主體28之外部花鍵齒40嚙合的內部花鍵齒64。鏈輪主體SP1A具有環狀形狀。內部花鍵齒64自鏈輪主體SP1A徑向向內延伸。 如圖26中所見，至少十個內部花鍵齒64之總數目等於或大於20。至少十個內部花鍵齒64之總數目等於或大於25。在此實施例中，內部花鍵齒64之總數目為26。然而，內部花鍵齒64之總數目不限於此實施例及以上範圍。 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。複數個內部花鍵齒64中之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以第一內部周節角PA21沿圓周配置。複數個內部花鍵齒64中之至少兩個內部花鍵齒相對於旋轉中心軸線A1以第二內部周節角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可實質上等於第一內部周節角PA21。 在此實施例中，內部花鍵齒64係在圓周方向D1上以第一內部周節角PA21沿圓周配置。內部花鍵齒64中之兩個內部花鍵齒係在圓周方向D1上以第二內部周節角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在10度至20度之範圍內。第一內部周節角PA21在12度至15度之範圍內。第一內部周節角PA21在13度至14度之範圍內。在此實施例中，第一內部周節角PA21為13.3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在5度至30度之範圍內。在此實施例中，第二內部周節角PA22為26度。然而，第二內部周節角PA22不限於此實施例及以上範圍。 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。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27中所見，內部花鍵齒64可具有彼此相同的形狀。內部花鍵齒64可具有彼此相同的大小。內部花鍵齒64可具有彼此相同的橫截面形狀。 如圖28中所見，至少一個內部花鍵齒64包含內部花鍵傳動表面66及內部花鍵非傳動表面68。至少一個內部花鍵齒64包括複數個內部花鍵齒64。複數個內部花鍵齒64包括用以在踩踏期間接收來自自行車輪轂總成12 (圖6)之傳動旋轉力F1的複數個內部花鍵傳動表面66。複數個內部花鍵齒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傳輸至鏈輪支撐主體28。內部花鍵傳動表面66面向傳動旋轉方向D11。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傳輸至鏈輪支撐主體28。 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。 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。內部花鍵傳動表面66自徑向最外邊緣66A延伸至徑向最內邊緣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與內部花鍵非傳動表面68在參考點68R處相交。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之總和等於或大於45 mm。圓周最大寬度MW2之總和等於或大於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29中所見，至少一個內部花鍵齒64具有內部花鍵底徑DM21。至少一個內部花鍵齒64具有內部花鍵齒根圓RC22，內部花鍵齒根圓RC22具有內部花鍵底徑DM21。然而，內部花鍵齒根圓RC22可具有不同於內部花鍵底徑DM21之另一直徑。內部花鍵底徑DM21等於或小於30 mm。內部花鍵底徑DM21等於或大於25 mm。內部花鍵底徑DM21等於或大於29 mm。在此實施例中，內部花鍵底徑DM21為29.6 mm。然而，內部花鍵底徑DM21不限於此實施例及以上範圍。在此實施例中，內部花鍵底徑DM21對齒尖直徑TD1之比率在0.1至0.2之範圍內。最大鏈輪SP12之齒尖直徑TD1 (圖1)在183.7 mm至207.9 mm之範圍內。內部花鍵底徑DM21對齒尖直徑TD1之比率在0.14至0.17之範圍內。然而，內部花鍵底徑DM21對齒尖直徑TD1之比率不限於以上範圍。 至少一個內部花鍵齒64具有等於或小於28 mm之內部花鍵頂徑DM22。內部花鍵頂徑DM22等於或大於25 mm。內部花鍵頂徑DM22等於或大於27 mm。在此實施例中，內部花鍵頂徑DM22為27.7 mm。然而，內部花鍵頂徑DM22不限於此實施例及以上範圍。 如圖28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之總和為19.5 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27.95 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。 內部花鍵齒64中之至少一者相對於圓周齒尖中心線CL2具有不對稱形狀。圓周齒尖中心線CL2為連接旋轉中心軸線A1及內部花鍵齒64之徑向最內端64A之圓周中心點CP2的線。然而，內部花鍵齒64中之至少一者可相對於圓周齒尖中心線CL2具有對稱形狀。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 (參見例如圖26)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不同於第一內部花鍵表面角AG21。第一內部花鍵表面角AG21小於第二內部花鍵表面角AG22。然而第一內部花鍵表面角AG21可等於或大於第二內部花鍵表面角AG22。 第一內部花鍵表面角AG21在0度至10度之範圍內。第二內部花鍵表面角AG22在0度至60度之範圍內。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45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30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自鏈輪SP1傳輸至鏈輪支撐主體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自鏈輪SP1傳輸至鏈輪支撐主體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。 如圖31中所見，鏈輪SP2包括複數個內部花鍵齒70。鏈輪SP3包括複數個內部花鍵齒72。鏈輪SP4包括複數個內部花鍵齒74。第一環59A包括複數個內部花鍵齒76。如圖32中所見，鏈輪支撐件56之輪轂嚙合部分60包括複數個內部花鍵齒78。複數個內部花鍵齒70具有與複數個內部花鍵齒64之結構實質上相同的結構。複數個內部花鍵齒72具有與複數個內部花鍵齒64之結構實質上相同的結構。複數個內部花鍵齒74具有與複數個內部花鍵齒64之結構實質上相同的結構。複數個內部花鍵齒76具有與複數個內部花鍵齒64之結構實質上相同的結構。複數個內部花鍵齒78具有與複數個內部花鍵齒64之結構實質上相同的結構。因此，出於簡潔起見，此處將不作詳細描述。 如圖6中所見，自行車後鏈輪總成14進一步包含後輪轂鄰接表面80。後輪轂鄰接表面80經構形以在自行車後鏈輪總成14安裝至自行車輪轂總成12之狀態中在相對於自行車後鏈輪總成14之旋轉中心軸線A1的軸向方向D2上鄰接自行車輪轂總成12。在此實施例中，後輪轂鄰接表面80在軸向方向D2上鄰接鏈輪支撐主體28之較大直徑部分42。後輪轂鄰接表面80設置於鏈輪支撐件56之輪轂嚙合部分60上。然而，後輪轂鄰接表面80之位置不限於此實施例。 最大鏈輪SP12具有軸向內表面SP12C及在相對於自行車後鏈輪總成14之旋轉中心軸線A1的軸向方向D2上設置於軸向內表面SP12C之反向側上的軸向外表面SP12D。相比於軸向內表面SP12C，軸向外表面SP12D在軸向方向D2上更接近後輪轂鄰接表面80。 如圖15中所見，自行車輪轂總成12具有在軸向方向D2上將自行車輪轂總成12二等分之軸向中心平面CPL。自行車輪轂總成12之軸向中心平面CPL垂直於旋轉中心軸線A1。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，相比於後輪轂鄰接表面80，軸向內表面SP12C經定位成更接近自行車後輪轂總成12之軸向中心平面CPL。在軸向方向D2上界定於軸向內表面SP12C與後輪轂鄰接表面80之間的軸向距離AD1等於或大於7 mm。軸向距離AD1等於或大於10 mm。然而，軸向距離AD1不限於以上範圍。 如圖9及圖10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，輪轂指示符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。此外，輪轂指示器28I可為例如藉由諸如黏附劑之黏合結構附接至鏈輪支撐主體28的單獨構件。輪轂指示器28I之位置不限於此實施例。 如圖26及圖27中所見，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。當沿旋轉中心軸線A1檢視時，鏈輪指示器SP1I設置於第二內部周節角PA22之區域中。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。此外，鏈輪指示器SP1I可為例如藉由諸如黏附劑之黏合結構附接至鏈輪SP1的單獨構件。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件56。 修改圖33說明根據自行車後鏈輪總成14之修改的自行車後鏈輪總成214。如圖33中所見，自行車後鏈輪總成214包含鏈輪SP1及複數個鏈輪SP202至SP212。鏈輪SP202至SP212具有與鏈輪SP2至SP12之結構實質上相同的結構。如圖33及圖34中所見，舉例而言，鏈輪SP212包括鏈輪主體SP12A及複數個鏈輪齒SP12B。 鏈輪SP202至SP212中之一者亦可被稱作第一鏈輪。鄰近於第一鏈輪之另一鏈輪亦可被稱作第二鏈輪。亦即，自行車後鏈輪總成214之至少一個鏈輪包括第一鏈輪及第二鏈輪。第一鏈輪具有第一總齒數。第二鏈輪具有小於第一總齒數之第二總齒數。第二鏈輪在軸向方向D2上鄰近於第一鏈輪，且第一鏈輪與第二鏈輪之間無另一鏈輪。 如圖33中所見，舉例而言，第一鏈輪SP212具有為51之第一總齒數。第二鏈輪SP211具有為45之第二總齒數。鏈輪SP212及SP211亦可被稱作第一鏈輪SP212及第二鏈輪SP211。鏈輪SP211及SP210亦可被稱作第一鏈輪SP211及第二鏈輪SP210。鏈輪SP210及SP209亦可被稱作第一鏈輪SP210及第二鏈輪SP209。鏈輪SP209及SP208亦可被稱作第一鏈輪SP209及第二鏈輪SP208。鏈輪SP208及SP207亦可被稱作第一鏈輪SP208及第二鏈輪SP207。鏈輪SP207及SP206亦可被稱作第一鏈輪SP207及第二鏈輪SP206。鏈輪SP206及SP205亦可被稱作第一鏈輪SP206及第二鏈輪SP205。鏈輪SP205及SP204亦可被稱作第一鏈輪SP205及第二鏈輪SP204。鏈輪SP204及SP203亦可被稱作第一鏈輪SP204及第二鏈輪SP203。鏈輪SP203及SP202亦可被稱作第一鏈輪SP203及第二鏈輪SP202。鏈輪SP202及SP1亦可被稱作第一鏈輪SP202及第二鏈輪SP1。 如圖34中所見，舉例而言，第一鏈輪SP212包括至少一個第一移位促進區域SP212X以促進自行車鏈20自第二鏈輪SP211移位至第一鏈輪SP212之第一移位操作。第一鏈輪SP212包括至少一個第二移位促進區域SP212Y以促進自行車鏈20自第一鏈輪SP212移位至第二鏈輪SP211之第二移位操作。在此實施例中，第一鏈輪SP212包括複數個第一移位促進區域SP212X以促進自行車鏈20自第二鏈輪SP211移位至第一鏈輪SP212之第一移位操作。第一鏈輪SP212包括複數個第二移位促進區域SP212Y以促進自行車鏈20自第一鏈輪SP212移位該第二鏈輪SP211之第二移位操作。 第一鏈輪SP212包括複數個第一移位促進凹槽SP212X1及複數個第二移位促進凹槽SP212Y1。第一移位促進凹槽SP212X1設置於第一移位促進區域SP212X中。第二移位促進凹槽SP212Y1設置於第二移位促進區域SP212Y中。 如圖35中所見，第一移位促進凹槽SP212X1設置於軸向外表面SP12D上以減少第一移位操作中第一鏈輪SP212與自行車鏈20 (圖33)之間的干擾。第二移位促進凹槽SP212Y1設置於軸向外表面SP12D上以減少第二移位操作中第一鏈輪SP212與自行車鏈20 (圖33)之間的干擾。第二移位促進凹槽SP212Y1在圓周方向D1上與第一移位促進凹槽SP212X1間隔開。 如圖36中所見，第一鏈輪SP212之複數個鏈輪齒SP12B包括複數個移位促進齒SP212B1至SP212B3。移位促進齒SP212B1至SP212B3設置於第二移位促進區域SP212Y中。如圖34中所見，第二移位促進區域SP212Y在圓周方向D1上由第二移位促進凹槽SP212Y1及移位促進齒SP212B3界定。 如圖37中所見，移位促進齒SP212B1包括促進凹槽SP212R1。移位促進齒SP212B2包括促進凹槽SP212R2。移位促進齒SP212B3包括促進凹槽SP212R3。促進凹槽SP212R1設置於軸向內表面SP12C上以促進在第二移位操作中使自行車鏈20與第一鏈輪SP212脫軌。促進凹槽SP212R2設置於軸向內表面SP12C上以促進在第二移位操作中使自行車鏈20與第一鏈輪SP212脫軌。促進凹槽SP212R3設置於軸向內表面SP12C上以促進在第二移位操作中使自行車鏈20與第一鏈輪SP212脫軌。 鏈輪SP202至SP211中之每一者的第一移位促進區域及第二移位促進區域分別具有與第一鏈輪SP212之第一移位促進區域SP212X及第二移位促進區域SP212Y之結構實質上相同的結構。出於簡潔起見，此處將不對其進行詳細描述。如本文中所使用，術語「移位促進區域」意欲為經有意設計以促進自行車鏈在區域中自一鏈輪至另一軸向鄰近鏈輪之移位操作的區域。 如圖38中所見，在上述實施例中，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之間的溝槽40G。溝槽40G減少自行車輪轂總成12之重量。 如圖39中所見，在上述實施例中，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之間的溝槽64G。溝槽64G減少自行車後鏈輪總成14之重量。 如本文中所使用之術語「包含」及其派生詞意欲為指定所陳述特徵、元件、組件、群組、整數及/或步驟之存在但不排除其他未陳述特徵、元件、組件、群組、整數及/或步驟之存在的開放術語。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」當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，例如特定次序及類似者。此外，例如，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的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」及「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「實質上」、「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「實質上」、「大約」及「大致」之術語。 顯然，鑒於以上教示，本發明之眾多修改及變化係可能的。因此應理解，在所附申請專利範圍之範疇內，可以不同於如本文中特定描述之方式的其他方式實踐本發明。This application is a continuation of US Patent Application No. 15 / 608,924, filed on May 30, 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 hub assembly 12 and a bicycle rear sprocket assembly 14. The bicycle hub assembly 12 is fastened to the bicycle frame BF. The bicycle rear sprocket assembly 14 is mounted on the bicycle hub assembly 12. The bicycle brake rotor 16 is mounted on the bicycle 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 the bicycle drive system 10, the bicycle hub assembly 12 or the bicycle rear sprocket assembly 14, should be related to the bicycle drive system 10 equipped as used in an upright riding position on a horizontal surface , Bicycle hub assembly 12 or bicycle rear sprocket assembly 14 to interpret. As seen in FIGS. 2 and 3, the bicycle 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 hub assembly 12 about a rotation center axis A1 with respect to the bicycle frame BF (FIG. 1). 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 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 hub assembly 12 includes a sprocket support body 28. 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 hub assembly 12 further includes a hub shaft 30. The sprocket support body 28 is rotatably mounted on the 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 an axial direction D2 parallel to the rotation center axis A1. As seen in FIG. 4, the bicycle hub assembly 12 is fastened to the bicycle frame BF by a wheel fastening structure WS. The hub shaft 30 has a through hole 30A. The fastening rod WS1 of the wheel fastening structure WS extends through the 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. As seen in FIGS. 4 and 5, the bicycle 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. 5, the bicycle hub assembly 12 further includes a hub body 36. The hub body 36 is rotatably mounted on the hub shaft 30 about a rotation center axis A1. 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 support body 34 may be a separate member from the hub body 36. The hub body 36 includes a first flange 36A and a second flange 36B. A first spoke (not shown) is coupled to the first flange 36A. A second spoke (not shown) is coupled to the second flange 36B. The second flange 36B is spaced from the first flange 36A in the axial direction D2. The first flange 36A is provided between the sprocket support body 28 and the second flange 36B in the axial direction D2. The second flange 36B is provided between the first flange 36A and the brake rotor support body 34 in the axial direction D2. The locking member 32 includes an externally threaded portion 32A. The sprocket support body 28 includes an internally threaded portion 28A. In a state where the lock member 32 is fastened to the sprocket support body 28, the externally threaded portion 32A is in threaded engagement with the internally threaded portion 28A. As seen in FIG. 6, the locking member 32 is configured to prevent axial movement of at least one sprocket mounted on the bicycle hub assembly 12 relative to the rotation center axis A1 of the bicycle rear sprocket assembly 14. As seen in FIG. 5, the locking member 32 includes a tubular body portion 32C and a protruding portion 32B. The tubular body portion 32C has a central axis A2. The protruding portion 32B extends radially outward from the tubular body portion 32C with respect to the central axis A2 of the tubular body portion 32C. The tubular body portion 32C has an outer threaded portion 32A that is configured to engage the inner threaded portion 28A of the bicycle hub assembly 12. As seen in Figure 6, the protruding portion 32B is configured to abut at least one sprocket. In this embodiment, the protruding portion 32B is configured to abut the sprocket SP1. The tubular body portion 32C has a first outer diameter ED1 equal to or smaller than 26 mm. The first outer diameter ED1 is equal to or greater than 25 mm. In this embodiment, the first outer diameter ED1 is 25.45 mm. However, the first outer diameter ED1 is not limited to this embodiment and the above range. The protruding portion 32B 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 second outer diameter ED2 is 31.5 mm. However, the second outer diameter ED2 is not limited to this embodiment and the above range. As seen in FIG. 5, the locking member 32 has a tool engaging portion 32D. A tool engaging portion 32D is provided on the inner peripheral surface 32C1 of the tubular body portion 32C to engage with a tool. The tool engaging portion 32D includes a plurality of tool engaging grooves 32D1 provided on the inner peripheral surface 32C1 of the tubular body portion 32C. However, the structure of the tool engaging portion 32D is not limited to this embodiment. In the illustrated embodiment, the tool engaging portion 32D may be omitted from the locking member 32 or may have another shape different from the tool engaging portion 32D. As seen in FIG. 6, the bicycle hub assembly 12 further includes a ratchet structure 38. The sprocket support body 28 is operatively coupled to the hub body 36 by a ratchet structure 38. The ratchet structure 38 is configured to couple the sprocket support body 28 to the hub body 36, thereby rotating the sprocket support body 28 together with the hub body 36 in the transmission rotation direction D11 (FIG. 5) during stepping. The ratchet structure 38 is configured to allow the sprocket support body 28 to rotate relative to the hub body 36 in the reverse rotation direction D12 (FIG. 5) during idle rotation. Therefore, the ratchet structure 38 can be interpreted as a unidirectional coupling structure 38. The ratchet structure 38 includes a structure known in the bicycle field. Therefore, for brevity, it will not be described in detail here. The bicycle hub assembly 12 includes a first bearing 39A and a second bearing 39B. The first bearing 39A and the second bearing 39B are provided 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 FIGS. 7 and 8, the sprocket support body 28 includes at least one outer spline tooth 40 configured to mesh with the bicycle rear sprocket assembly 14 (FIG. 6). The sprocket support body 28 includes a plurality of 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 at least nine external spline teeth 40 configured to mesh with the bicycle rear sprocket assembly 14 (FIG. 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). 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 protruding portion 32B 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. As needed, the larger diameter portion 42 may be omitted from the bicycle hub assembly 12. As seen in FIG. 9, 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 equal to or greater than 25. In this embodiment, the total number of at least ten external spline teeth 40 is 26. 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 plurality of outer spline teeth 40 are arranged circumferentially at a first outer pitch angle PA11 with respect to the rotation center axis A1 of the bicycle hub assembly 12. At least two outer spline teeth of the plurality of outer spline teeth 40 are arranged circumferentially at a second outer pitch angle PA12 with respect to the rotation center axis A1 of the bicycle hub assembly 12. 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 external spline teeth 40 are arranged at a first external pitch angle PA11 in the circumferential direction D1. Two of the outer spline teeth 40 are arranged at a 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 is in a range of 10 degrees to 20 degrees. The first outer perimeter angle PA11 is in a range of 12 degrees to 15 degrees. The first outer perimeter angle PA11 is in a range of 13 degrees to 14 degrees. In this embodiment, the first outer perimeter angle PA11 is 13.3 degrees. However, the first outer perimeter angle PA11 is not limited to this embodiment and above. The second section angle PA12 is in the range of 5 to 30 degrees. In this embodiment, the second outer perimeter angle PA12 is 26 degrees. However, the second outer perimeter angle PA12 is not limited to this embodiment and above. The outer spline teeth 40 have substantially the same shape as each other. The outer spline teeth 40 have spline sizes that are substantially the same as each other. When viewed along the rotation center axis A1, the outer spline teeth 40 have substantially the same contours as each other. However, as seen in FIG. 10, at least one of the at least ten external spline teeth 40 may have a first spline shape that is different from a second spline shape of the other of the at least ten 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 at least ten outer spline teeth 40 may have a profile different from that of the other of the at least ten outer spline teeth 40. In FIG. 10, one of the external spline teeth 40 has a spline shape different from that of the other teeth of the external spline teeth 40. One of the external spline teeth 40 has a spline size different from the spline size of the other teeth in the external spline teeth 40. When viewed along the rotation center axis A1, one of the external spline teeth 40 has a profile different from that of the other teeth in the external spline teeth 40. As seen in FIG. 11, 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. 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. 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 outer 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. The reference point 50R is disposed between the radially outermost edge 50A and the radially innermost edge 50B. However, the reference point 50R may coincide with 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 equal to or greater than 60 mm. The sum of the maximum circumferential width MW1 is equal to or greater than 65 mm. In this embodiment, the sum of the maximum circumferential widths MW1 is 68 mm. However, the sum of the maximum circumferential width MW1 is not limited to this embodiment and the above range. As seen in FIG. 12, at least one outer spline tooth 40 has an outer spline tip diameter DM11. The external spline top diameter DM11 is equal to or greater than 25 mm. The external spline top diameter DM11 is equal to or greater than 29 mm. The external spline top diameter DM11 is 30 mm or less. In this embodiment, the outer spline top diameter DM11 is 29.6 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 28 mm. The outer spline diameter DM12 is equal to or greater than 25 mm. The outer spline diameter DM12 is equal to or greater than 27 mm. In this embodiment, the outer diameter DM12 of the external spline is 27.2 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 is in the range of 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. 11, the plurality of external 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 of the radial length RL11 is equal to or greater than 15 mm. In this embodiment, the sum of the radial lengths RL11 is 19.5 mm. However, the sum of the radial lengths RL11 is not limited to this embodiment. The plurality of outer spline teeth 40 have a radial length RL12. The 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 radial lengths RL12 is equal to or greater than 12 mm. In this embodiment, the total of the radial length RL12 is 31.85 mm. However, the sum of the radial lengths RL12 is not limited to this embodiment. At least one of the at least nine outer spline teeth 40 has an asymmetric shape with respect to the circumferential tooth tip center line CL1. The circumferential tooth tip center line CL1 is a line connecting the rotation center axis A1 and the circumferential center point CP1 of the radially outermost end 40A of the external spline tooth 40. However, at least one of the outer spline teeth 40 may have a symmetrical shape with respect to the circumferential tooth tip center line CL1. At least one of the at least nine external spline teeth 40 includes an external spline drive surface 48 and an external spline non-drive surface 50. The external spline drive surface 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 hub assembly 12 to the radially outermost edge 48A of the outer 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. 9). The external spline non-drive surface 50 has a second external 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 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 different from the first external spline surface angle AG11. The first external spline surface angle AG11 is smaller than the second external spline surface angle AG12. However, the first external spline surface angle AG11 may be equal to or larger than the second external spline surface angle AG12. The first external spline surface angle AG11 is in a range of 0 to 10 degrees. The second external spline surface angle AG12 is in the range of 0 to 60 degrees. In this embodiment, the first external spline surface angle AG11 is 5 degrees. The second external spline surface angle AG12 is 45 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 FIGS. 13 and 14, the brake rotor support body 34 includes at least one additional external spline tooth 52 configured to mesh with the bicycle brake rotor 16 (FIG. 4). 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 14, at least one additional external spline tooth 52 has an additional external spline tip diameter DM14. As seen in Figure 15, 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. 16, the hub shaft 30 includes an axial contact surface 30B1 to contact the bicycle frame BF. In this embodiment, the axial contact surface 30B1 may be in contact with the first frame BF1 of the bicycle frame BF. The first frame BF1 includes a frame contact surface BF12. In a state where the bicycle hub assembly 12 is fastened to the bicycle frame BF by the wheel fastening structure WS, the axial contact surface 30B1 is in contact with the frame contact surface BF12. The first axial length AL11 is defined from the axial contact surface 30B1 to the larger diameter portion 42 in the axial direction D2 with respect to the rotation center axis A1. The first axial length AL11 is in the range of 35 mm to 41 mm. The first axial length AL11 may be equal to or greater than 39 mm. The first axial length AL11 can also be in the range of 35 mm to 37 mm. In this embodiment, the first axial length AL11 is 36.2 mm. However, the first axial length AL11 is not limited to this embodiment and the above range. The larger-diameter portion 42 has an axial end 42A furthest from the axial contact surface 30B1 in the axial direction D2. The second axial length AL12 is defined in the axial direction D2 from the axial contact surface 30B1 to the axial end 42A. The second axial length AL12 is in the range of 38 mm to 47 mm. The second axial length AL12 can be in the range of 44 mm to 45 mm. The second axial length AL12 can also be in the range of 40 mm to 41 mm. In this embodiment, the second axial length AL12 is 40.75 mm. However, the second axial length AL12 is not limited to this embodiment and the above range. The axial length AL13 of the larger diameter portion 42 is in the range of 3 mm to 6 mm. In this embodiment, the axial length AL13 is 4.55 mm. However, the axial length AL13 is not limited to this embodiment and the above range. As seen in FIG. 17, the bicycle rear sprocket assembly 14 includes at least one sprocket. At least one sprocket includes a plurality of sprocket wheels. The at least one sprocket includes at least ten sprocket wheels. The at least one sprocket includes at least eleven sprocket. The at least one sprocket includes at least twelve sprocket. The plurality of sprockets includes a maximum sprocket SP12. The largest sprocket SP12 has a tooth tip diameter TD1. The plurality of sprockets also includes the smallest sprocket SP1. The smallest sprocket SP1 may also be referred to as a sprocket SP1. The largest sprocket SP12 can also be called a sprocket SP12. In this embodiment, at least one sprocket further includes sprocket SP2 to SP11. The sprocket SP1 corresponds to a high-speed gear. The sprocket SP12 corresponds to a low-speed gear. In this embodiment, the total number of the plurality of sprockets is twelve. However, the total number of sprocket wheels of the bicycle rear sprocket assembly 14 is not limited to this embodiment. The smallest sprocket SP1 includes at least one sprocket tooth SP1B. The total number of at least one sprocket tooth SP1B of the smallest sprocket SP1 is equal to or less than ten. In this embodiment, the total number of at least one sprocket tooth SP1B of the smallest sprocket SP1 is ten. However, the total number of at least one sprocket tooth SP1B of the smallest sprocket SP1 is not limited to this embodiment and the above range. The largest sprocket SP12 includes at least one sprocket tooth SP12B. The total number of teeth of the largest sprocket SP12 is equal to or greater than 39. The total number of teeth of the largest sprocket SP12 is equal to or greater than 45. The total number of at least one sprocket tooth SP12B of the largest sprocket SP12 is equal to or greater than 46. The total number of at least one sprocket tooth SP12B of the largest sprocket SP12 is equal to or greater than 50. In this embodiment, the total number of at least one sprocket tooth SP12B of the largest sprocket SP12 is 51. However, the total number of at least one sprocket tooth SP12B of the largest sprocket SP12 is not limited to this embodiment and the above range. The tooth tip diameter TD1 is the diameter of a circle defined by the tooth tip of the sprocket tooth SP12B. The sprocket SP2 includes at least one sprocket tooth SP2B. The sprocket SP3 includes at least one sprocket tooth SP3B. The sprocket SP4 includes at least one sprocket tooth SP4B. The sprocket SP5 includes at least one sprocket tooth SP5B. The sprocket SP6 includes at least one sprocket tooth SP6B. The sprocket SP7 includes at least one sprocket tooth SP7B. The sprocket SP8 includes at least one sprocket tooth SP8B. The sprocket SP9 includes at least one sprocket tooth SP9B. The sprocket SP10 includes at least one sprocket tooth SP10B. The sprocket SP11 includes at least one sprocket tooth SP11B. The total number of at least one sprocket tooth SP2B is twelve. The total number of at least one sprocket tooth SP3B is fourteen. The total number of at least one sprocket tooth SP4B is sixteen. The total number of at least one sprocket tooth SP5B is 18. The total number of at least one sprocket tooth SP6B is 21. The total number of at least one sprocket tooth SP7B is 24. The total number of at least one sprocket tooth SP8B is 28. The total number of at least one sprocket tooth SP9B is 33. The total number of at least one sprocket tooth SP10B is 39. The total number of at least one sprocket tooth SP11B is 45. At least one sprocket has a total number of teeth equal to or greater than 15. For example, the total number of teeth of the sprocket SP4 is 16. The total number of teeth of sprocket SP5 is 18. The total number of teeth of sprocket SP6 is 21. The total number of teeth of the sprocket SP7 is 24. The total number of teeth of sprocket SP8 is 28. The total number of teeth of sprocket SP9 is 33. The total number of teeth of the sprocket SP10 is 39. The total number of teeth of sprocket SP11 is 45. The total number of teeth of sprocket SP12 is 51. The total number of sprocket teeth of each of the sprocket SP2 to SP11 is not limited to this embodiment. At least one of the sprockets SP1 to SP12 may include a total number of teeth equal to or greater than 15. As seen in FIG. 18, 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. The bicycle rear sprocket assembly 14 further includes a sprocket support 56, a plurality of spacers 58, a first ring 59A, and a second ring 59B. In the illustrated embodiment, a plurality of sprockets SP1 to SP12 are attached to the sprocket support 56. For example, a plurality of sprockets SP1 to SP12 are attached to the sprocket support 56 by an adhesive. As seen in FIG. 19, the sprocket SP1 includes a sprocket body SP1A and a plurality of sprocket teeth SP1B. A plurality of sprocket teeth SP1B extend radially outward from the sprocket body SP1A. The sprocket SP2 includes a sprocket body SP2A and a plurality of sprocket teeth SP2B. A plurality of sprocket teeth SP2B extend radially outward from the sprocket body SP2A. The sprocket SP3 includes a sprocket body SP3A and a plurality of sprocket teeth SP3B. A plurality of sprocket teeth SP3B extend radially outward from the sprocket body SP3A. The sprocket SP4 includes a sprocket body SP4A and a plurality of sprocket teeth SP4B. A plurality of sprocket teeth SP4B extend radially outward from the sprocket body SP4A. The sprocket SP5 includes a sprocket body SP5A and a plurality of sprocket teeth SP5B. A plurality of sprocket teeth SP5B extend radially outward from the sprocket body SP5A. The first ring 59A is provided between the sprocket SP3 and the sprocket SP4. The second ring 59B is provided between the sprocket SP4 and the sprocket SP5. As seen in FIG. 20, the sprocket SP6 includes a sprocket body SP6A and a plurality of sprocket teeth SP6B. A plurality of sprocket teeth SP6B extend radially outward from the sprocket body SP6A. The sprocket SP7 includes a sprocket body SP7A and a plurality of sprocket teeth SP7B. A plurality of sprocket teeth SP7B extend radially outward from the sprocket body SP7A. The sprocket SP8 includes a sprocket body SP8A and a plurality of sprocket teeth SP8B. A plurality of sprocket teeth SP8B extend radially outward from the sprocket body SP8A. As seen in FIG. 21, the sprocket SP9 includes a sprocket body SP9A and a plurality of sprocket teeth SP9B. A plurality of sprocket teeth SP9B extend radially outward from the sprocket body SP9A. The sprocket SP10 includes a sprocket body SP10A and a plurality of sprocket teeth SP10B. A plurality of sprocket teeth SP10B extend radially outward from the sprocket body SP10A. The sprocket SP11 includes a sprocket body SP11A and a plurality of sprocket teeth SP11B. A plurality of sprocket teeth SP11B extend radially outward from the sprocket body SP11A. The sprocket SP12 includes a sprocket body SP12A and a plurality of sprocket teeth SP12B. A plurality of sprocket teeth SP12B extend radially outward from the sprocket body SP12A. As seen in FIG. 22, the sprocket support 56 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 58 include a plurality of first spacers 58A, a plurality of second spacers 58B, a plurality of third spacers 58C, a plurality of fourth spacers 58D, a plurality of fifth spacers 58E, and a plurality of sixths. The spacer 58F and the plurality of seventh spacers 58G. As seen in FIG. 23, the first spacer 58A is disposed between the sprocket SP5 and the sprocket SP6. The second spacer 58B is provided between the sprocket SP6 and the sprocket SP7. The third spacer 58C is provided between the sprocket SP7 and the sprocket SP8. The fourth spacer 58D is provided between the sprocket SP8 and the sprocket SP9. The fifth spacer 58E is provided between the sprocket SP9 and the sprocket SP10. The sixth spacer 58F is provided between the sprocket SP10 and the sprocket SP11. The seventh spacer 58G is provided between the sprocket SP11 and the sprocket SP12. The sprocket SP6 and the first spacer 58A are attached to the first attachment portion 62A by an adhesive structure such as an adhesive. The sprocket SP7 and the second spacer 58B are attached to the second attachment portion 62B by an adhesive structure such as an adhesive. The sprocket SP8 and the third spacer 58C are attached to the third attachment portion 62C by an adhesive structure such as an adhesive. The sprocket SP9 and the fourth spacer 58D are attached to the fourth attachment portion 62D by an adhesive structure such as an adhesive. The sprocket SP10 and the fifth spacer 58E are attached to the fifth attachment portion 62E by an adhesive structure such as an adhesive. The sprocket SP11 and the sixth spacer 58F are attached to the sixth attachment portion 62F by an adhesive structure such as an adhesive. The sprocket SP12 and the seventh spacer 58G are attached to the seventh attachment portion 62G by an adhesive structure such as an adhesive. The sprocket SP5 and the second ring 59B are attached to the eighth attachment portion 62H by an adhesive structure such as an adhesive. The hub engaging portion 60, the sprockets SP1 to SP4, the first ring 59A, and the second ring 59B are held between the larger-diameter portion 42 and the protruding portion 32B 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. Each of the sprocket support 56, the first to seventh spacers 58A to 58G, the first ring 59A, and the second ring 59B is made of a non-metal material such as a resin material. The sprocket support 56 is made of a non-metal material including a resin material. However, at least one of the sprockets SP1 to SP12 may be made at least partially of a non-metal material. At least one of the sprocket support 56, the first to seventh spacers 58A to 58G, the first ring 59A, and the second ring 59B may be made at least partially of a metal material such as aluminum, iron, or titanium. The at least one sprocket includes at least one internal spline tooth configured to mesh with the bicycle hub assembly 12. As seen in Figures 24 and 25, at least one sprocket includes at least ten internal spline teeth configured to mesh with the bicycle hub assembly 12. At least one internal spline tooth includes a plurality of internal spline teeth. Thus, at least one sprocket includes a plurality of internal spline teeth configured to mesh with the bicycle hub assembly 12. In this embodiment, the sprocket SP1 includes at least ten internal spline teeth 64 configured to mesh with the bicycle hub assembly 12. In this embodiment, the sprocket SP1 includes an internal spline tooth 64 configured to mesh with the external spline tooth 40 of the sprocket support body 28 of the bicycle hub assembly 12. The sprocket body SP1A has a ring shape. The internal spline teeth 64 extend radially inward from the sprocket body SP1A. As seen in FIG. 26, the total number of at least ten internal spline teeth 64 is equal to or greater than 20. The total number of at least ten internal spline teeth 64 is equal to or greater than 25. In this embodiment, the total number of internal spline teeth 64 is 26. However, the total number of internal spline teeth 64 is not limited to this embodiment and the above range. At least ten internal spline teeth 64 have a first internal peripheral angle PA21 and a second internal peripheral angle PA22. At least two of the plurality of internal spline teeth 64 are arranged circumferentially with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14 at the first internal pitch angle PA21. At least two of the plurality of internal spline teeth 64 are arranged circumferentially at a 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 circumferentially 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 is in a range of 10 to 20 degrees. The first internal perimeter angle PA21 is in a range of 12 degrees to 15 degrees. The first internal perimeter angle PA21 is in a range of 13 degrees to 14 degrees. In this embodiment, the first internal perimeter angle PA21 is 13.3 degrees. However, the first internal perimeter angle PA21 is not limited to this embodiment and above. The second inner perimeter angle PA22 is in a range of 5 to 30 degrees. In this embodiment, the second inner perimeter angle PA22 is 26 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 has a first spline shape that is 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 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. 27, the internal spline teeth 64 may have the same shape as each other. The internal spline teeth 64 may have the same size as each other. The internal spline teeth 64 may have the same cross-sectional shape as each other. As seen in FIG. 28, at least one internal spline tooth 64 includes an internal spline drive surface 66 and an internal spline non-drive surface 68. At least one internal spline tooth 64 includes a plurality of internal spline teeth 64. The plurality of internal spline teeth 64 include a plurality of internal spline transmission surfaces 66 to receive a transmission rotational force F1 from the bicycle hub assembly 12 (FIG. 6) during pedaling. The plurality of 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. 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 stepping. 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. The internal spline drive surface 66 includes a radially outermost edge 66A and a radially innermost edge 66B. The internal spline drive surface 66 extends from the radially outermost edge 66A to the 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 is equal to or greater than 45 mm. The sum of the maximum circumferential width MW2 is equal to or greater than 50 mm. In this embodiment, the sum of the maximum circumferential widths MW2 is 50.8 mm. However, the total of the maximum circumferential width MW2 is not limited to this embodiment. As seen in FIG. 29, at least one internal spline tooth 64 has an internal spline base diameter DM21. At least one internal spline tooth 64 has an internal spline tooth root circle RC22, and the internal spline tooth root circle RC22 has an internal spline base diameter DM21. However, the internal spline tooth root circle RC22 may have another diameter different from the internal spline base diameter DM21. The internal spline diameter DM21 is 30 mm or less. The internal spline diameter DM21 is equal to or greater than 25 mm. The internal spline diameter DM21 is equal to or greater than 29 mm. In this embodiment, the bottom spline diameter DM21 is 29.6 mm. However, the bottom spline diameter DM21 is not limited to this embodiment and the above range. In this embodiment, the ratio of the internal spline bottom diameter DM21 to the tooth tip diameter TD1 is in the range of 0.1 to 0.2. The diameter TD1 (Figure 1) of the largest sprocket SP12 is in the range of 183.7 mm to 207.9 mm. The ratio of the internal spline bottom diameter DM21 to the tooth tip diameter TD1 is in the range of 0.14 to 0.17. However, the ratio of the internal spline bottom diameter DM21 to the tooth tip diameter TD1 is not limited to the above range. At least one internal spline tooth 64 has an internal spline top diameter DM22 equal to or less than 28 mm. The internal spline top diameter DM22 is equal to or greater than 25 mm. The internal spline top diameter DM22 is equal to or greater than 27 mm. In this embodiment, the internal spline top diameter DM22 is 27.7 mm. However, the internal spline tip diameter DM22 is not limited to this embodiment and above. As seen in FIG. 28, 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 total of the radial length RL21 is 19.5 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 lengths RL22 is 27.95 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 internal spline teeth 64 has an asymmetric shape with respect to the circumferential tooth tip center line CL2. The circumferential tooth tip center line CL2 is a line connecting the rotation center axis A1 and the circumferential center point CP2 of the radially innermost end 64A of the internal spline tooth 64. However, at least one of the internal spline teeth 64 may have a symmetrical shape with respect to the circumferential tooth tip center 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. 26). 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 different from the first internal spline surface angle AG21. The first internal spline surface angle AG21 is smaller than the second internal spline surface angle AG22. However, the first internal spline surface angle AG21 may be equal to or larger than the second internal spline surface angle AG22. The first internal spline surface angle AG21 is in a range of 0 to 10 degrees. The second internal spline surface angle AG22 is in a range of 0 to 60 degrees. In this embodiment, the first internal spline surface angle AG21 is 5 degrees. The second internal spline surface angle AG22 is 45 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. 30, the internal spline teeth 64 mesh with the external spline teeth 40 to transmit the transmission rotational force F1 from the sprocket SP1 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 sprocket SP1 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. As seen in FIG. 31, the sprocket SP2 includes a plurality of internal spline teeth 70. The sprocket SP3 includes a plurality of internal spline teeth 72. The sprocket SP4 includes a plurality of internal spline teeth 74. The first ring 59A includes a plurality of internal spline teeth 76. As seen in FIG. 32, the hub engaging portion 60 of the sprocket support 56 includes a plurality of internal spline teeth 78. The plurality of internal spline teeth 70 have substantially the same structure as the structure of the plurality of internal spline teeth 64. The plurality of internal spline teeth 72 have substantially the same structure as the structure of the plurality of internal spline teeth 64. The plurality of internal spline teeth 74 have substantially the same structure as the structure of the plurality of internal spline teeth 64. The plurality of internal spline teeth 76 have substantially the same structure as the structure of the plurality of internal spline teeth 64. The plurality of internal spline teeth 78 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. 6, the bicycle rear sprocket assembly 14 further includes a rear hub abutment surface 80. The rear hub abutment surface 80 is configured to abut the bicycle in the axial direction D2 with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14 in a state where the bicycle rear sprocket assembly 14 is mounted to the bicycle hub assembly 12 Wheel Assembly 12. In this embodiment, the rear hub abutment surface 80 abuts the larger diameter portion 42 of the sprocket support body 28 in the axial direction D2. The rear hub abutment surface 80 is provided on the hub engaging portion 60 of the sprocket support 56. However, the position of the rear hub abutting surface 80 is not limited to this embodiment. The largest sprocket SP12 has an axial inner surface SP12C and an axial outer surface SP12D provided on the reverse side of the axial inner surface SP12C in the axial direction D2 with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14 . The axial outer surface SP12D is closer to the rear hub abutting surface 80 in the axial direction D2 than the axial inner surface SP12C. As seen in FIG. 15, the bicycle hub assembly 12 has an axial center plane CPL that bisects the bicycle hub assembly 12 in the axial direction D2. The axial center plane CPL of the bicycle hub assembly 12 is perpendicular to the rotation center axis A1. 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 axially inner surface SP12C is positioned closer to the bicycle rear hub assembly than the rear hub abutment surface 80. The axial center plane CPL of 12. The axial distance AD1 defined in the axial direction D2 between the axial inner surface SP12C and the rear hub abutting surface 80 is equal to or greater than 7 mm. The axial distance AD1 is equal to or greater than 10 mm. However, the axial distance AD1 is not limited to the above range. As seen in FIGS. 9 and 10, 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. Further, the hub indicator 28I may be a separate member attached to the sprocket support body 28 by, for example, an adhesive structure such as an adhesive. The position of the hub indicator 28I is not limited to this embodiment. As seen in FIGS. 26 and 27, the sprocket SP1 includes a sprocket indicator SP1I provided at an axial end of the sprocket body SP1A. When viewed along the rotation center axis A1, the sprocket indicator SP1I is set in the area of the second inner peripheral angle PA22. 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. Further, the sprocket indicator SP1I may be a separate member attached to the sprocket SP1 by, for example, an adhesive 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 56. Modification FIG. 33 illustrates a bicycle rear sprocket assembly 214 modified according to the bicycle rear sprocket assembly 14. As seen in FIG. 33, the bicycle rear sprocket assembly 214 includes a sprocket SP1 and a plurality of sprocket SP202 to SP212. The sprocket SP202 to SP212 have substantially the same structure as that of the sprocket SP2 to SP12. As seen in FIGS. 33 and 34, for example, the sprocket SP212 includes a sprocket body SP12A and a plurality of sprocket teeth SP12B. One of the sprockets SP202 to SP212 may also be referred to as a first sprocket. Another sprocket adjacent to the first sprocket may also be referred to as a second sprocket. That is, at least one sprocket of the bicycle rear sprocket assembly 214 includes a first sprocket and a second sprocket. The first sprocket has a first total number of teeth. The second sprocket has a second total number of teeth that is less than the first total number of teeth. The second sprocket is adjacent to the first sprocket in the axial direction D2, and there is no other sprocket between the first and second sprocket. As seen in FIG. 33, for example, the first sprocket SP212 has a first total number of teeth of 51. The second sprocket SP211 has a second total number of teeth of 45. The sprocket SP212 and SP211 may also be referred to as a first sprocket SP212 and a second sprocket SP211. The sprocket SP211 and SP210 may also be referred to as a first sprocket SP211 and a second sprocket SP210. The sprocket SP210 and SP209 can also be referred to as a first sprocket SP210 and a second sprocket SP209. The sprocket SP209 and SP208 may also be referred to as a first sprocket SP209 and a second sprocket SP208. The sprocket SP208 and SP207 may also be referred to as a first sprocket SP208 and a second sprocket SP207. The sprocket SP207 and SP206 can also be referred to as a first sprocket SP207 and a second sprocket SP206. The sprocket SP206 and SP205 may also be referred to as a first sprocket SP206 and a second sprocket SP205. The sprocket SP205 and SP204 may also be referred to as a first sprocket SP205 and a second sprocket SP204. The sprocket SP204 and SP203 may also be referred to as a first sprocket SP204 and a second sprocket SP203. The sprocket SP203 and SP202 may also be referred to as a first sprocket SP203 and a second sprocket SP202. The sprocket SP202 and SP1 may also be referred to as a first sprocket SP202 and a second sprocket SP1. As seen in FIG. 34, for example, the first sprocket SP212 includes at least one first shift promotion area SP212X to facilitate the first shift operation of the bicycle chain 20 from the second sprocket SP211 to the first sprocket SP212 . The first sprocket SP212 includes at least one second shift promotion area SP212Y to facilitate the second shift operation of shifting the bicycle chain 20 from the first sprocket SP212 to the second sprocket SP211. In this embodiment, the first sprocket SP212 includes a plurality of first shift promotion areas SP212X to facilitate the first shift operation of shifting the bicycle chain 20 from the second sprocket SP211 to the first sprocket SP212. The first sprocket SP212 includes a plurality of second shift promotion areas SP212Y to facilitate the second shift operation of the bicycle chain 20 from the first sprocket SP212 to the second sprocket SP211. The first sprocket SP212 includes a plurality of first shift promotion grooves SP212X1 and a plurality of second shift promotion grooves SP212Y1. The first shift promotion groove SP212X1 is provided in the first shift promotion region SP212X. The second shift promotion groove SP212Y1 is provided in the second shift promotion region SP212Y. As seen in FIG. 35, the first shift promotion groove SP212X1 is provided on the axial outer surface SP12D to reduce interference between the first sprocket SP212 and the bicycle chain 20 (FIG. 33) in the first shift operation. The second shift promotion groove SP212Y1 is provided on the axial outer surface SP12D to reduce interference between the first sprocket SP212 and the bicycle chain 20 (FIG. 33) in the second shift operation. The second shift promotion groove SP212Y1 is spaced from the first shift promotion groove SP212X1 in the circumferential direction D1. As seen in FIG. 36, the plurality of sprocket teeth SP12B of the first sprocket SP212 include a plurality of shift promoting teeth SP212B1 to SP212B3. The displacement promotion teeth SP212B1 to SP212B3 are provided in the second displacement promotion area SP212Y. As seen in FIG. 34, the second displacement promotion area SP212Y is defined by the second displacement promotion groove SP212Y1 and the displacement promotion teeth SP212B3 in the circumferential direction D1. As seen in FIG. 37, the displacement promotion tooth SP212B1 includes a promotion groove SP212R1. The displacement promotion tooth SP212B2 includes a promotion groove SP212R2. The displacement promotion tooth SP212B3 includes a promotion groove SP212R3. The promotion groove SP212R1 is provided on the axial inner surface SP12C to facilitate derailment of the bicycle chain 20 from the first sprocket SP212 in the second shift operation. The promotion groove SP212R2 is provided on the axial inner surface SP12C to facilitate derailment of the bicycle chain 20 from the first sprocket SP212 in the second shift operation. The promotion groove SP212R3 is provided on the axial inner surface SP12C to facilitate derailment of the bicycle chain 20 from the first sprocket SP212 in the second shift operation. The first shift promotion region and the second shift promotion region of each of the sprockets SP202 to SP211 have a structure that is the same as the first shift promotion region SP212X and the second shift promotion region SP212Y of the first sprocket SP212. Substantially the same structure. For brevity, they will not be described in detail here. As used herein, the term "shift promotion area" is intended to be an area that is intentionally designed to facilitate the shifting operation of a bicycle chain from one sprocket to another axially adjacent sprocket in the area. As seen in FIG. 38, in the above embodiment, the external spline teeth 40 may include a groove 40G provided between the external spline driving surface 48 and the external spline non-driving surface 50 in the circumferential direction D1. The groove 40G reduces the weight of the bicycle hub assembly 12. As seen in FIG. 39, in the above embodiment, the internal spline teeth 64 may include a groove 64G provided between the internal spline driving surface 66 and the internal spline non-driving surface 68 in the circumferential direction D1. The groove 64G reduces the weight of the bicycle rear sprocket assembly 14. The term "comprising" and its derivatives, as used herein, are intended to specify the existence of stated features, elements, components, groups, integers, and / or steps but do not exclude other unstated features, components, components, groups, groups, Open term for the presence of integers and / or 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. 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 the like. 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", "about" and "approximately". Obviously, many modifications and variations of the present invention are possible in light of 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‧‧‧自行車輪轂總成12‧‧‧ Bicycle 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‧‧‧自行車鏈條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‧‧‧內部帶螺紋部分28A‧‧‧Internal threaded part

30‧‧‧輪轂軸30‧‧‧ hub axle

30A‧‧‧通孔30A‧‧‧through hole

30B‧‧‧第一軸端30B‧‧‧First shaft end

30B1‧‧‧軸向接觸表面30B1‧‧‧ axial contact surface

30C‧‧‧第二軸端30C‧‧‧Second shaft end

32‧‧‧鎖定構件32‧‧‧ lock member

32A‧‧‧外部帶螺紋部分32A‧‧‧External threaded part

32B‧‧‧突出部分32B‧‧‧ Highlight

32C‧‧‧管狀主體部分32C‧‧‧Tubular body part

32C1‧‧‧內周邊表面32C1‧‧‧Inner peripheral surface

32D‧‧‧工具嚙合部分32D‧‧‧Tool engagement part

32D1‧‧‧工具嚙合凹槽32D1‧‧‧Tool engagement groove

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

36‧‧‧輪轂主體36‧‧‧Wheel body

36A‧‧‧第一凸緣36A‧‧‧First flange

36B‧‧‧第二凸緣36B‧‧‧Second flange

38‧‧‧棘輪結構/單向聯軸結構38‧‧‧ Ratchet structure / one-way coupling structure

39A‧‧‧第一軸承39A‧‧‧First bearing

39B‧‧‧第二軸承39B‧‧‧Second bearing

40‧‧‧外部花鍵齒40‧‧‧ external spline teeth

40A‧‧‧徑向最外端40A‧‧‧ Radial outermost

40G‧‧‧溝槽40G‧‧‧Trench

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

56‧‧‧鏈輪支撐件56‧‧‧Sprocket support

58‧‧‧間隔件58‧‧‧ spacer

58A‧‧‧第一間隔件58A‧‧‧First spacer

58B‧‧‧第二間隔件58B‧‧‧Second spacer

58C‧‧‧第三間隔件58C‧‧‧The third spacer

58D‧‧‧第四間隔件58D‧‧‧Fourth spacer

58E‧‧‧第五間隔件58E‧‧‧Fifth spacer

58F‧‧‧第六間隔件58F‧‧‧ Sixth spacer

58G‧‧‧第七間隔件58G‧‧‧Seventh spacer

59A‧‧‧第一環59A‧‧‧First Ring

59B‧‧‧第二環59B‧‧‧Second Ring

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

64‧‧‧內部花鍵齒64‧‧‧ Internal spline teeth

64A‧‧‧徑向最內端64A‧‧‧ Radial innermost

64G‧‧‧溝槽64G‧‧‧Trench

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

70‧‧‧內部花鍵齒70‧‧‧ Internal spline teeth

72‧‧‧內部花鍵齒72‧‧‧ Internal spline teeth

74‧‧‧內部花鍵齒74‧‧‧ Internal spline teeth

76‧‧‧內部花鍵齒76‧‧‧ Internal spline teeth

78‧‧‧內部花鍵齒78‧‧‧ Internal spline teeth

80‧‧‧後輪轂鄰接表面80‧‧‧ rear hub abutment surface

214‧‧‧自行車後鏈輪總成214‧‧‧ Bicycle rear sprocket assembly

A1‧‧‧旋轉中心軸線A1‧‧‧rotation center axis

A2‧‧‧中心軸線A2‧‧‧center axis

AD1‧‧‧軸向距離AD1‧‧‧Axial distance

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

AL11‧‧‧第一軸向長度AL11‧‧‧First axial length

AL12‧‧‧第二軸向長度AL12‧‧‧Second axial length

AL13‧‧‧軸向長度AL13‧‧‧Axial length

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‧‧‧框架接觸表面BF12‧‧‧Frame contact surface

BF21‧‧‧第二凹槽BF21‧‧‧Second groove

CL1‧‧‧圓周齒尖中心線CL1‧‧‧Circular tooth tip centerline

CL2‧‧‧圓周齒尖中心線CL2‧‧‧Circular tooth tip centerline

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

D2‧‧‧軸向方向D2‧‧‧ axial direction

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

D12‧‧‧反向旋轉方向D12‧‧‧Reverse rotation 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

F1‧‧‧傳動旋轉力F1‧‧‧Drive rotation force

F2‧‧‧推力F2‧‧‧thrust

F3‧‧‧推力F3‧‧‧thrust

IV-IV‧‧‧線IV-IV‧‧‧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

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

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‧‧‧徑向長度RL12‧‧‧Radial length

RL21‧‧‧徑向長度RL21‧‧‧Radial length

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

SP1‧‧‧鏈輪SP1‧‧‧Sprocket

SP1A‧‧‧鏈輪主體SP1A‧‧‧Sprocket body

SP1B‧‧‧鏈輪齒SP1B‧‧‧Sprocket teeth

SP2‧‧‧鏈輪SP2‧‧‧Sprocket

SP2A‧‧‧鏈輪主體SP2A‧‧‧Sprocket body

SP2B‧‧‧鏈輪齒SP2B‧‧‧Sprocket Teeth

SP3‧‧‧鏈輪SP3‧‧‧Sprocket

SP3A‧‧‧鏈輪主體SP3A‧‧‧Sprocket body

SP3B‧‧‧鏈輪齒SP3B‧‧‧Sprocket Teeth

SP4‧‧‧鏈輪SP4‧‧‧Sprocket

SP4A‧‧‧鏈輪主體SP4A‧‧‧Sprocket body

SP4B‧‧‧鏈輪齒SP4B‧‧‧Sprocket teeth

SP5‧‧‧鏈輪SP5‧‧‧Sprocket

SP5A‧‧‧鏈輪主體SP5A‧‧‧Sprocket body

SP5B‧‧‧鏈輪齒SP5B‧‧‧Sprocket Teeth

SP6‧‧‧鏈輪SP6‧‧‧Sprocket

SP6A‧‧‧鏈輪主體SP6A‧‧‧Sprocket body

SP6B‧‧‧鏈輪齒SP6B‧‧‧Sprocket teeth

SP7‧‧‧鏈輪SP7‧‧‧Sprocket

SP7A‧‧‧鏈輪主體SP7A‧‧‧Sprocket body

SP7B‧‧‧鏈輪齒SP7B‧‧‧Sprocket teeth

SP8‧‧‧鏈輪SP8‧‧‧Sprocket

SP8A‧‧‧鏈輪主體SP8A‧‧‧Sprocket body

SP8B‧‧‧鏈輪齒SP8B‧‧‧Sprocket teeth

SP9‧‧‧鏈輪SP9‧‧‧Sprocket

SP9A‧‧‧鏈輪主體SP9A‧‧‧Sprocket body

SP9B‧‧‧鏈輪齒SP9B‧‧‧Sprocket teeth

SP10‧‧‧鏈輪SP10‧‧‧Sprocket

SP10A‧‧‧鏈輪主體SP10A‧‧‧Sprocket body

SP10B‧‧‧鏈輪齒SP10B‧‧‧Sprocket teeth

SP11‧‧‧鏈輪SP11‧‧‧Sprocket

SP11A‧‧‧鏈輪主體SP11A‧‧‧Sprocket body

SP11B‧‧‧鏈輪齒SP11B‧‧‧Sprocket teeth

SP12‧‧‧鏈輪SP12‧‧‧Sprocket

SP12A‧‧‧鏈輪主體SP12A‧‧‧Sprocket body

SP12B‧‧‧鏈輪齒SP12B‧‧‧Sprocket teeth

SP12C‧‧‧軸向內表面SP12C‧‧‧Axial inner surface

SP12D‧‧‧軸向外表面SP12D‧‧‧Axial outer surface

SP202‧‧‧鏈輪SP202‧‧‧Sprocket

SP203‧‧‧鏈輪SP203‧‧‧Sprocket

SP204‧‧‧鏈輪SP204‧‧‧Sprocket

SP205‧‧‧鏈輪SP205‧‧‧Sprocket

SP206‧‧‧鏈輪SP206‧‧‧Sprocket

SP207‧‧‧鏈輪SP207‧‧‧Sprocket

SP208‧‧‧鏈輪SP208‧‧‧Sprocket

SP209‧‧‧鏈輪SP209‧‧‧Sprocket

SP210‧‧‧鏈輪SP210‧‧‧Sprocket

SP211‧‧‧鏈輪SP211‧‧‧Sprocket

SP212‧‧‧鏈輪SP212‧‧‧Sprocket

SP212B1‧‧‧移位促進齒SP212B1‧‧‧Shift promotion teeth

SP212B2‧‧‧移位促進齒SP212B2 ‧‧‧ Shift Promoting Teeth

SP212B3‧‧‧移位促進齒SP212B3‧‧‧Shift promotion teeth

SP212R1‧‧‧促進凹槽SP212R1‧‧‧Promotion groove

SP212R2‧‧‧促進凹槽SP212R2 ‧‧‧ promote groove

SP212R3‧‧‧促進凹槽SP212R3 ‧‧‧ promote groove

SP212X‧‧‧第一移位促進區域SP212X‧‧‧First shift promotion area

SP212X1‧‧‧第一移位促進凹槽SP212X1‧‧‧First shift promotion groove

SP212Y‧‧‧第二移位促進區域SP212Y‧‧‧Second shift promotion area

SP212Y1‧‧‧第二移位促進凹槽SP212Y1‧‧‧Second shift promotion groove

TD1‧‧‧齒尖直徑TD1‧‧‧Tooth Tip Diameter

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

WS1‧‧‧緊固桿WS1‧‧‧Fastening lever

XVI-XVI‧‧‧線XVI-XVI‧‧‧line

XXIII-XXIII‧‧‧線XXIII-XXIII‧‧‧line

當結合附圖考慮時，參考以下詳細描述，本發明之更完整評價及其許多伴隨優點將易於獲得，同樣變得更好理解，其中： 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為圖2中所說明之自行車傳動系統的另一透視圖。 圖4為沿圖2之線IV-IV截取之自行車傳動系統的橫截面圖。 圖5為圖2中所說明之自行車傳動系統之自行車輪轂總成的分解透視圖。 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2中所說明之自行車傳動系統之自行車輪轂總成之鏈輪支撐主體的透視圖。 圖8為圖2中所說明之自行車傳動系統之自行車輪轂總成之鏈輪支撐主體的另一透視圖。 圖9為圖7中所說明之鏈輪支撐主體的側視圖。 圖10為根據修改之自行車輪轂總成之鏈輪支撐主體的側視圖。 圖11為圖7中所說明之鏈輪支撐主體的放大橫截面圖。 圖12為圖7中所說明之鏈輪支撐主體的橫截面圖。 圖13為圖2中所說明之自行車傳動系統之自行車輪轂總成的透視圖。 圖14為圖2中所說明之自行車傳動系統之自行車輪轂總成的側視圖。 圖15為圖2中所說明之自行車傳動系統之自行車輪轂總成的後視圖。 圖16為沿圖5之線XVI-XVI截取之自行車輪轂總成的橫截面圖。 圖17為圖2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18為圖17中所說明之自行車後鏈輪總成的分解透視圖。 圖19為圖17中所說明之自行車後鏈輪總成的部分分解透視圖。 圖20為圖17中所說明之自行車後鏈輪總成的另一部分分解透視圖。 圖21為圖17中所說明之自行車後鏈輪總成的另一部分分解透視圖。 圖22為圖17中所說明之自行車後鏈輪總成的另一部分分解透視圖。 圖23為沿圖17之線XXIII-XXIII截取之自行車後鏈輪總成的透視橫截面圖。 圖24為圖17中所說明之自行車後鏈輪總成之最小鏈輪的透視圖。 圖25為圖17中所說明之自行車後鏈輪總成之最小鏈輪的另一透視圖。 圖26為圖17中所說明之自行車後鏈輪總成之最小鏈輪的側視圖。 圖27為根據修改之最小鏈輪的側視圖。 圖28為圖24中所說明之最小鏈輪的放大截面視圖。 圖29為圖24中所說明之最小鏈輪的橫截面圖。 圖30為圖2中所說明之自行車傳動系統之鏈輪支撐主體及最小鏈輪的橫截面圖。 圖31為圖17中所說明之自行車後鏈輪總成的部分分解透視圖。 圖32為圖17中所說明之自行車後鏈輪總成之鏈輪支撐件的透視圖。 圖33為根據修改之自行車後鏈輪總成的側視圖。 圖34為圖33中所說明之自行車後鏈輪總成之第一鏈輪的側視圖。 圖35為圖33中所說明之自行車後鏈輪總成之第一鏈輪的部分透視圖。 圖36為圖33中所說明之自行車後鏈輪總成之第一鏈輪的另一側視圖。 圖37為圖33中所說明之自行車後鏈輪總成之第一鏈輪的另一部分透視圖。 圖38為根據修改之鏈輪支撐主體的放大橫截面圖。 圖39為根據修改之最小鏈輪的放大橫截面圖。When considered in conjunction with the drawings, with reference to the following detailed description, a more complete evaluation of the present invention and many of its accompanying advantages will be readily available and also better understood, where: 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 another perspective view of the bicycle transmission system illustrated in FIG. 2. 4 is a cross-sectional view of the bicycle transmission system taken along line IV-IV of FIG. 2. FIG. 5 is an exploded perspective view of a bicycle hub assembly of the bicycle transmission system illustrated in FIG. 2. FIG. 6 is an enlarged cross-sectional view of the bicycle transmission system illustrated in FIG. 4. 7 is a perspective view of a sprocket support body of a bicycle hub assembly of the bicycle transmission system illustrated in FIG. 2. 8 is another perspective view of a sprocket support body of a bicycle hub assembly of the bicycle transmission system illustrated in FIG. 2. FIG. 9 is a side view of the sprocket support body illustrated in FIG. 7. FIG. 10 is a side view of a sprocket support body of a bicycle hub assembly according to a modification. FIG. 11 is an enlarged cross-sectional view of the sprocket support body illustrated in FIG. 7. FIG. 12 is a cross-sectional view of the sprocket support body illustrated in FIG. 7. FIG. 13 is a perspective view of a bicycle hub assembly of the bicycle transmission system illustrated in FIG. 2. 14 is a side view of a bicycle hub assembly of the bicycle transmission system illustrated in FIG. 2. FIG. 15 is a rear view of the bicycle hub assembly of the bicycle transmission system illustrated in FIG. 2. FIG. 16 is a cross-sectional view of the bicycle hub assembly taken along the line XVI-XVI of FIG. 5. 17 is a side view of a bicycle rear sprocket assembly of the bicycle transmission system illustrated in FIG. 2. FIG. 18 is an exploded perspective view of the bicycle rear sprocket assembly illustrated in FIG. 17. FIG. 19 is a partially exploded perspective view of the bicycle rear sprocket assembly illustrated in FIG. 17. 20 is an exploded perspective view of another portion of the bicycle rear sprocket assembly illustrated in FIG. 17. 21 is an exploded perspective view of another part of the bicycle rear sprocket assembly illustrated in FIG. 17. 22 is an exploded perspective view of another portion of the bicycle rear sprocket assembly illustrated in FIG. 17. FIG. 23 is a perspective cross-sectional view of the bicycle rear sprocket assembly taken along the line XXIII-XXIII of FIG. 17. FIG. 24 is a perspective view of the smallest sprocket of the bicycle rear sprocket assembly illustrated in FIG. 17. 25 is another perspective view of the smallest sprocket of the bicycle rear sprocket assembly illustrated in FIG. 17. FIG. 26 is a side view of the smallest sprocket of the bicycle rear sprocket assembly illustrated in FIG. 17. Figure 27 is a side view of the smallest sprocket according to the modification. FIG. 28 is an enlarged cross-sectional view of the smallest sprocket illustrated in FIG. 24. FIG. 29 is a cross-sectional view of the smallest sprocket illustrated in FIG. 24. FIG. 30 is a cross-sectional view of the sprocket support body and the smallest sprocket of the bicycle transmission system illustrated in FIG. 2. FIG. 31 is a partially exploded perspective view of the bicycle rear sprocket assembly illustrated in FIG. 17. 32 is a perspective view of a sprocket support of the bicycle rear sprocket assembly illustrated in FIG. 17. FIG. 33 is a side view of a bicycle rear sprocket assembly according to a modification. FIG. 34 is a side view of the first sprocket of the bicycle rear sprocket assembly illustrated in FIG. 33. FIG. 35 is a partial perspective view of a first sprocket of the bicycle rear sprocket assembly illustrated in FIG. 33. FIG. 36 is another side view of the first sprocket of the bicycle rear sprocket assembly illustrated in FIG. 33. FIG. 37 is another perspective view of the first sprocket of the bicycle rear sprocket assembly illustrated in FIG. 33. FIG. 38 is an enlarged cross-sectional view of a sprocket support body according to a modification. Figure 39 is an enlarged cross-sectional view of the smallest sprocket according to the modification.

Claims (51)

一種自行車後鏈輪總成，其包含： 至少一個鏈輪，其具有等於或大於15之一總齒數，該至少一個鏈輪包括經構形以與一自行車輪轂總成嚙合之至少十個內部花鍵齒。A bicycle rear sprocket assembly comprising: at least one sprocket having a total number of teeth equal to or greater than 15, the at least one sprocket including at least ten internal flowers configured to mesh with a bicycle hub assembly Key teeth. 如請求項1之自行車後鏈輪總成，其中 該至少十個內部花鍵齒之一總數目等於或大於20。For example, the bicycle rear sprocket assembly of claim 1, wherein the total number of one of the at least ten internal spline teeth is equal to or greater than 20. 如請求項2之自行車後鏈輪總成，其中 該至少十個內部花鍵齒之該總數目等於或大於25。For example, the bicycle rear sprocket assembly of claim 2, wherein the total number of the at least ten internal spline teeth is equal to or greater than 25. 如請求項1之自行車後鏈輪總成，其中 該至少十個內部花鍵齒具有一第一內部周節角及不同於該第一內部周節角之一第二內部周節角。For example, the bicycle rear sprocket assembly of claim 1, wherein the at least ten internal spline teeth have a first internal peripheral angle and a second internal peripheral angle different from the first internal peripheral angle. 如請求項1之自行車後鏈輪總成，其中 該至少一個鏈輪包括至少十個鏈輪。As in the bicycle rear sprocket assembly of claim 1, wherein the at least one sprocket includes at least ten sprocket wheels. 如請求項1之自行車後鏈輪總成，其中 該至少一個鏈輪包括至少十一個鏈輪。The bicycle rear sprocket assembly of claim 1, wherein the at least one sprocket includes at least eleven sprockets. 如請求項1之自行車後鏈輪總成，其中 該至少一個鏈輪包括至少十二個鏈輪。The bicycle rear sprocket assembly of claim 1, wherein the at least one sprocket includes at least twelve sprocket wheels. 如請求項1之自行車後鏈輪總成，其中 該至少一個鏈輪包括複數個鏈輪及經構形以與一自行車輪轂總成嚙合之至少一個內部花鍵齒， 該複數個鏈輪包括具有一齒尖直徑之一最大鏈輪， 該至少一個內部花鍵齒具有一內部花鍵底徑，且 該內部花鍵底徑對該齒尖直徑之一比率在0.1至0.2之範圍內。If the bicycle rear sprocket assembly of claim 1, wherein the at least one sprocket includes a plurality of sprockets and at least one internal spline tooth configured to mesh with a bicycle hub assembly, the plurality of sprocket includes One of the largest sprocket wheels with a tooth tip diameter, the at least one inner spline tooth has an inner spline base diameter, and a ratio of the inner spline base diameter to one of the tooth tip diameters is in a range of 0.1 to 0.2. 如請求項1之自行車後鏈輪總成，其中 該至少一個鏈輪包括： 一第一鏈輪，其具有一第一總齒數；及 一第二鏈輪，其具有小於該第一總齒數之一第二總齒數， 該第一鏈輪包括： 至少一個第一移位促進區域，其用以促進一自行車鏈自該第二鏈輪移位至該第一鏈輪之一第一移位操作，及 至少一個第二移位促進區域，其用以促進該自行車鏈自該第一鏈輪移位至該第二鏈輪之一第二移位操作。The bicycle rear sprocket assembly of claim 1, wherein the at least one sprocket includes: a first sprocket having a first total number of teeth; and a second sprocket having a number less than the first total number of teeth. A second total number of teeth, the first sprocket includes: at least one first displacement promotion area for promoting a first displacement operation of a bicycle chain from the second sprocket to one of the first sprocket , And at least one second shift promotion area for promoting the second shift operation of shifting the bicycle chain from the first sprocket to one of the second sprocket. 如請求項1之自行車後鏈輪總成，其進一步包含 一鎖定構件，其經構形以阻止安裝於一自行車輪轂總成上之該至少一個鏈輪相對於該自行車後鏈輪總成之一旋轉中心軸線的一軸向移動，其中 該鎖定構件包括： 一管狀主體部分，其具有一中心軸線；及 一突出部分，其相對於該管狀主體部分之該中心軸線自該管狀主體部分徑向向外延伸， 該管狀主體部分具有經構形以與該自行車輪轂總成之一內部帶螺紋部分嚙合的一外部帶螺紋部分，且 該突出部分經構形以鄰接該至少一個鏈輪。If the bicycle rear sprocket assembly of claim 1, further comprising a locking member configured to prevent one of the at least one sprocket mounted on a bicycle hub assembly relative to one of the bicycle rear sprocket assembly An axial movement of the rotation central axis, wherein the locking member includes: a tubular body portion having a central axis; and a protruding portion radially from the tubular body portion with respect to the central axis of the tubular body portion. Extending outward, the tubular body portion has an externally threaded portion configured to engage an internally threaded portion of one of the bicycle hub assemblies, and the protruding portion is configured to abut the at least one sprocket. 如請求項10之自行車後鏈輪總成，其中 該管狀主體部分具有等於或小於26 mm之一第一外徑。The bicycle rear sprocket assembly of claim 10, wherein the tubular body portion has a first outer diameter equal to or smaller than 26 mm. 如請求項11之自行車後鏈輪總成，其中 該第一外徑等於或大於25 mm。The bicycle rear sprocket assembly of claim 11, wherein the first outer diameter is equal to or greater than 25 mm. 如請求項10之自行車後鏈輪總成，其中 該突出部分具有等於或小於32 mm之一第二外徑。The bicycle rear sprocket assembly of claim 10, wherein the protruding portion has a second outer diameter equal to or smaller than 32 mm. 如請求項13之自行車後鏈輪總成，其中 該第二外徑等於或大於30 mm。The bicycle rear sprocket assembly of claim 13, wherein the second outer diameter is equal to or greater than 30 mm. 如請求項10之自行車後鏈輪總成，其中 該鎖定構件具有一工具嚙合部分。A bicycle rear sprocket assembly as claimed in claim 10, wherein the lock member has a tool engaging portion. 如請求項1之自行車後鏈輪總成，其進一步包含 一鏈輪支撐件，其中 該至少一個鏈輪包括附接至該鏈輪支撐件之複數個鏈輪。If the bicycle rear sprocket assembly of claim 1, further comprising a sprocket support, wherein the at least one sprocket includes a plurality of sprocket wheels attached to the sprocket support. 如請求項16之自行車後鏈輪總成，其中 該複數個鏈輪藉由一黏附劑附接至該鏈輪支撐件。The bicycle rear sprocket assembly of claim 16, wherein the plurality of sprocket wheels are attached to the sprocket support by an adhesive. 如請求項16之自行車後鏈輪總成，其中 該鏈輪支撐件由包括一樹脂材料之一非金屬材料製成。The bicycle rear sprocket assembly of claim 16, wherein the sprocket support is made of a non-metallic material including a resin material. 如請求項1之自行車後鏈輪總成，其進一步包含 一後輪轂鄰接表面，其經構形以在該自行車後鏈輪總成安裝至一自行車輪轂總成之一狀態中在相對於該自行車後鏈輪總成之一旋轉中心軸線的一軸向方向上鄰接該自行車輪轂總成，其中 該至少一個鏈輪包括複數個鏈輪，該複數個鏈輪包括一最大鏈輪，該最大鏈輪具有一軸向內表面及在該軸向方向上設置於該軸向內表面之一反向側上的一軸向外表面，相比於該軸向內表面，該軸向外表面在該軸向方向上更接近該後輪轂鄰接表面，且 在該軸向方向上界定於該軸向內表面與該後輪轂鄰接表面之間的一軸向距離等於或大於7 mm。The bicycle rear sprocket assembly of claim 1, further comprising a rear hub abutment surface configured to be relative to the bicycle in a state in which the bicycle rear sprocket assembly is mounted to a bicycle hub assembly. One of the rear sprocket assemblies is adjacent to the bicycle hub assembly in an axial direction of a rotation center axis, wherein the at least one sprocket includes a plurality of sprocket wheels, the plurality of sprocket wheels includes a largest sprocket wheel, and the largest sprocket wheel It has an axial inner surface and an axial outer surface disposed on an opposite side of the axial inner surface in the axial direction. Compared with the axial inner surface, the axial outer surface is on the shaft The rear hub abutting surface is closer in the direction, and an axial distance defined between the axial inner surface and the rear hub abutting surface in the axial direction is equal to or greater than 7 mm. 如請求項19之自行車後鏈輪總成，其中 該軸向距離等於或大於10 mm。The bicycle rear sprocket assembly of claim 19, wherein the axial distance is equal to or greater than 10 mm. 一種自行車後鏈輪總成，其包含： 至少一個鏈輪，其具有等於或大於15之一總齒數，該至少一個鏈輪包括經構形以與一自行車輪轂總成嚙合之至少一個內部花鍵齒，該至少一個內部花鍵齒具有等於或小於30 mm之一內部花鍵底徑。A bicycle rear sprocket assembly comprising: at least one sprocket having a total number of teeth equal to or greater than 15, the at least one sprocket including at least one internal spline configured to mesh with a bicycle hub assembly Tooth, the at least one internal spline tooth has an internal spline base diameter equal to or less than 30 mm. 如請求項21之自行車後鏈輪總成，其中 該內部花鍵底徑等於或大於25 mm。For example, the bicycle rear sprocket assembly of claim 21, wherein the bottom diameter of the internal spline is equal to or greater than 25 mm. 如請求項21之自行車後鏈輪總成，其中 該內部花鍵底徑等於或大於29 mm。For example, the bicycle rear sprocket assembly of item 21, wherein the bottom diameter of the internal spline is equal to or greater than 29 mm. 如請求項21之自行車後鏈輪總成，其中 該至少一個內部花鍵齒具有等於或小於28 mm之一內部花鍵頂徑。The bicycle rear sprocket assembly of claim 21, wherein the at least one internal spline tooth has an internal spline top diameter equal to or less than 28 mm. 如請求項24之自行車後鏈輪總成，其中 該內部花鍵頂徑等於或大於25 mm。For example, the bicycle rear sprocket assembly of claim 24, wherein the internal spline top diameter is equal to or greater than 25 mm. 如請求項24之自行車後鏈輪總成，其中 該內部花鍵頂徑等於或大於27 mm。For example, the bicycle rear sprocket assembly of claim 24, wherein the internal spline top diameter is equal to or greater than 27 mm. 如請求項21之自行車後鏈輪總成，其中 該至少一個內部花鍵齒包括複數個內部花鍵齒，該複數個內部花鍵齒包括用以在踩踏期間接收來自該自行車輪轂總成之一傳動旋轉力的複數個內部花鍵傳動表面， 該複數個內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 該等徑向長度之一總和等於或大於7 mm。If the bicycle rear sprocket assembly of claim 21, wherein the at least one internal spline tooth includes a plurality of internal spline teeth, the plurality of internal spline teeth includes one for receiving from the bicycle hub assembly during pedaling A plurality of internal spline drive surfaces for transmitting rotational force, each of the plurality of internal spline drive surfaces includes a radial outermost edge, a radial innermost edge, and a radial length from the radial outermost The edge is defined to the radially innermost edge, and the sum of one of the radial lengths is equal to or greater than 7 mm. 如請求項27之自行車後鏈輪總成，其中 該等徑向長度之該總和等於或大於10 mm。If the bicycle rear sprocket assembly of claim 27, wherein the sum of the radial lengths is equal to or greater than 10 mm. 如請求項27之自行車後鏈輪總成，其中 該等徑向長度之該總和等於或大於15 mm。If the bicycle rear sprocket assembly of claim 27, wherein the sum of the radial lengths is equal to or greater than 15 mm. 如請求項21之自行車後鏈輪總成，其中 該至少一個鏈輪包括至少十個鏈輪。The bicycle rear sprocket assembly of claim 21, wherein the at least one sprocket includes at least ten sprocket wheels. 如請求項21之自行車後鏈輪總成，其中 該至少一個鏈輪包括至少十一個鏈輪。The bicycle rear sprocket assembly of claim 21, wherein the at least one sprocket includes at least eleven sprockets. 如請求項21之自行車後鏈輪總成，其中 該至少一個鏈輪包括至少十二個鏈輪。The bicycle rear sprocket assembly of claim 21, wherein the at least one sprocket includes at least twelve sprocket wheels. 如請求項21之自行車後鏈輪總成，其中 該至少一個鏈輪包括複數個鏈輪， 該複數個鏈輪包括具有一齒尖直徑之一最大鏈輪，且 該內部花鍵底徑對該齒尖直徑之一比率在0.1至0.2之範圍內。For example, the bicycle rear sprocket assembly of claim 21, wherein the at least one sprocket includes a plurality of sprocket wheels, the plurality of sprocket wheels includes one of the largest sprocket wheels having a tooth tip diameter, and the bottom diameter of the internal spline is opposite to One ratio of the diameter of the tooth tip is in the range of 0.1 to 0.2. 如請求項21之自行車後鏈輪總成，其中 該至少一個鏈輪包括： 一第一鏈輪，其具有一第一總齒數；及 一第二鏈輪，其具有小於該第一總齒數之一第二總齒數， 該第一鏈輪包括： 至少一個第一移位促進區域，其用以促進一自行車鏈自該第二鏈輪移位至該第一鏈輪之一第一移位操作；及 至少一個第二移位促進區域，其用以促進該自行車鏈自該第一鏈輪移位至該第二鏈輪之一第二移位操作。The bicycle rear sprocket assembly of claim 21, wherein the at least one sprocket includes: a first sprocket having a first total number of teeth; and a second sprocket having a number less than the first total number of teeth. A second total number of teeth, the first sprocket includes: at least one first shift promotion area for promoting a first shift operation of a bicycle chain from the second sprocket to one of the first sprocket And at least one second shift promotion area for promoting a second shift operation of shifting the bicycle chain from the first sprocket to one of the second sprocket. 如請求項21之自行車後鏈輪總成，其進一步包含 一鎖定構件，其經構形以阻止安裝於一自行車輪轂總成上之該至少一個鏈輪相對於該自行車後鏈輪總成之一旋轉中心軸線的一軸向移動，其中 該鎖定構件包括： 一管狀主體部分，其具有一中心軸線；及 一突出部分，其相對於該管狀主體部分之該中心軸線自該管狀主體部分徑向向外延伸， 該管狀主體部分具有經構形以與該自行車輪轂總成之一內部帶螺紋部分嚙合的一外部帶螺紋部分，且 該突出部分經構形以鄰接該至少一個鏈輪。The bicycle rear sprocket assembly of claim 21, further comprising a locking member configured to prevent one of the at least one sprocket mounted on a bicycle hub assembly relative to the bicycle rear sprocket assembly. An axial movement of the rotation central axis, wherein the locking member includes: a tubular body portion having a central axis; and a protruding portion radially from the tubular body portion with respect to the central axis of the tubular body portion. Extending outward, the tubular body portion has an externally threaded portion configured to engage an internally threaded portion of one of the bicycle hub assemblies, and the protruding portion is configured to abut the at least one sprocket. 如請求項35之自行車後鏈輪總成，其中 該管狀主體部分具有等於或小於26 mm之一第一外徑。The bicycle rear sprocket assembly of claim 35, wherein the tubular body portion has a first outer diameter equal to or smaller than 26 mm. 如請求項36之自行車後鏈輪總成，其中 該第一外徑等於或大於25 mm。The bicycle rear sprocket assembly of claim 36, wherein the first outer diameter is equal to or greater than 25 mm. 如請求項35之自行車後鏈輪總成，其中 該突出部分具有等於或小於32 mm之一第二外徑。The bicycle rear sprocket assembly of claim 35, wherein the protruding portion has a second outer diameter equal to or smaller than 32 mm. 如請求項38之自行車後鏈輪總成，其中 該第二外徑等於或大於30 mm。The bicycle rear sprocket assembly of claim 38, wherein the second outer diameter is equal to or greater than 30 mm. 如請求項35之自行車後鏈輪總成，其中 該鎖定構件具有一工具嚙合部分。A bicycle rear sprocket assembly as claimed in claim 35, wherein the lock member has a tool engaging portion. 如請求項21之自行車後鏈輪總成，其進一步包含 一鏈輪支撐件，其中 該至少一個鏈輪包括附接至該鏈輪支撐件之複數個鏈輪。The bicycle rear sprocket assembly of claim 21, further comprising a sprocket support, wherein the at least one sprocket includes a plurality of sprocket wheels attached to the sprocket support. 如請求項41之自行車後鏈輪總成，其中 該複數個鏈輪藉由一黏附劑附接至該鏈輪支撐件。The bicycle rear sprocket assembly of claim 41, wherein the plurality of sprocket wheels are attached to the sprocket support by an adhesive. 如請求項41之自行車後鏈輪總成，其中 該鏈輪支撐件由包括一樹脂材料之一非金屬材料製成。The bicycle rear sprocket assembly of claim 41, wherein the sprocket support is made of a non-metallic material including a resin material. 如請求項21之自行車後鏈輪總成，其進一步包含 一後輪轂鄰接表面，其經構形以在該自行車後鏈輪總成安裝至一自行車輪轂總成之一狀態中在相對於該自行車後鏈輪總成之一旋轉中心軸線的一軸向方向上鄰接該自行車輪轂總成，其中 該至少一個鏈輪包括複數個鏈輪，該複數個鏈輪包括一最大鏈輪，該最大鏈輪具有一軸向內表面及在該軸向方向上設置於該軸向內表面之一反向側上的一軸向外表面，相比於該軸向內表面，該軸向外表面在該軸向方向上更接近該後輪轂鄰接表面，且 在該軸向方向上界定於該軸向內表面與該後輪轂鄰接表面之間的一軸向距離等於或大於7 mm。The bicycle rear sprocket assembly of claim 21, further comprising a rear hub abutment surface configured to be relative to the bicycle in a state in which the bicycle rear sprocket assembly is mounted to a bicycle hub assembly. One of the rear sprocket assemblies is adjacent to the bicycle hub assembly in an axial direction of a rotation center axis, wherein the at least one sprocket includes a plurality of sprocket wheels, the plurality of sprocket wheels includes a largest sprocket wheel, and the largest sprocket wheel It has an axial inner surface and an axial outer surface disposed on an opposite side of the axial inner surface in the axial direction. Compared with the axial inner surface, the axial outer surface is on the shaft The rear hub abutting surface is closer in the direction, and an axial distance defined between the axial inner surface and the rear hub abutting surface in the axial direction is equal to or greater than 7 mm. 如請求項44之自行車後鏈輪總成，其中 該軸向距離等於或大於10 mm。As in the bicycle rear sprocket assembly of claim 44, wherein the axial distance is equal to or greater than 10 mm. 一種自行車後鏈輪總成，其包含： 複數個鏈輪，其包括一最大鏈輪，該最大鏈輪具有一軸向內表面及在相對於該自行車後鏈輪總成之一旋轉中心軸線的一軸向方向上設置於該軸向內表面之一反向側上的一軸向外表面； 一後輪轂鄰接表面，其經構形以在該自行車後鏈輪總成安裝至一自行車輪轂總成之一狀態中在該軸向方向上鄰接該自行車輪轂總成，相比於該軸向內表面，該軸向外表面在該軸向方向上更接近該後輪轂鄰接表面；及 在該軸向方向上界定於該軸向內表面與該後輪轂鄰接表面之間的一軸向距離等於或大於7 mm。A bicycle rear sprocket assembly includes: a plurality of sprocket wheels including a largest sprocket, the largest sprocket having an axial inner surface and a center axis of rotation relative to one of the bicycle rear sprocket assembly An axial outer surface disposed on an opposite side of the axial inner surface in an axial direction; a rear hub abutting surface configured to be mounted to a bicycle hub assembly at the bicycle rear sprocket assembly Adjoining the bicycle hub assembly in the axial direction in one of the states, the axial outer surface is closer to the rear hub abutting surface in the axial direction than the axial inner surface; and at the shaft An axial distance defined in the axial direction between the axial inner surface and the abutting surface of the rear hub is equal to or greater than 7 mm. 如請求項46之自行車後鏈輪總成，其中 該軸向距離等於或大於10 mm。The bicycle rear sprocket assembly of claim 46, wherein the axial distance is equal to or greater than 10 mm. 如請求項46之自行車後鏈輪總成，其中 在該自行車後鏈輪總成安裝至該自行車輪轂總成之一狀態中，相比於該後輪轂鄰接表面，該軸向內表面經定位成更接近該自行車輪轂總成之一軸向中心平面。For example, the bicycle rear sprocket assembly of item 46, wherein in the state where the bicycle rear sprocket assembly is mounted to one of the bicycle hub assemblies, the axially inner surface is positioned to be Closer to one of the axial center planes of the bicycle hub assembly. 如請求項46之自行車後鏈輪總成，其中 該複數個鏈輪之一總數目為12。For example, the bicycle rear sprocket assembly of item 46, wherein the total number of one of the plurality of sprocket wheels is twelve. 如請求項46之自行車後鏈輪總成，其中 該最大鏈輪之一總齒數等於或大於39。For example, the bicycle rear sprocket assembly of item 46, wherein the total number of teeth of one of the largest sprocket wheels is equal to or greater than 39. 如請求項46之自行車後鏈輪總成，其中 該最大鏈輪之一總齒數等於或大於45。For example, the bicycle rear sprocket assembly of claim 46, wherein the total number of teeth of one of the largest sprocket wheels is equal to or greater than 45.