YBR125 motorcycle gearbox spindle assembly, shaft length of 165.8MM, number of gear teeth (24T/18T/19T/22T/14T) and the original car gearbox completely match, direct replacement without adjusting the gear clearance; Equipped with various gear transmission gears, one-stop replacement of transmission power input shaft, save the trouble of purchasing gear separately; Gear tooth surface quenching treatment, high wear resistance, anti-tooth damage, to ensure the gear meshing smoothness and durability; The size error of the journal is small, and the bearing/bushing is closely cooperated, and the operation is not loose or abnormal. After replacing the old spindle, only need to adjust the gear gap can be used, strong adaptability.