YBR125 motorcycle shift shaft assembly, shaft diameter, shift dial interface and YBR125 transmission fully match, directly replace the original shift shaft, no need to modify the shift mechanism; The shaft body adopts the titanium alloy plating process, which has high hardness and corrosion resistance, and is suitable for the friction condition of frequent gearshift. Equipped with shift fork assembly, no additional matching after installation, shift action transfer more direct, no virtual bit; The built-in reset spring can automatically return to position after shifting, ensuring the smoothness and accuracy of gear switching; Precise clearance between shaft teeth and fork, clear hand feel when shifting, reduce the probability of misoperation.