428 ybr125 motorcycle rear sprocket 1)wide in variety 2)quality ... /46T/47T/48T/49T/50T/51T/52T/53T/54TChain:420,428,428H,415,520,530MaterialA3 steel45#steelHeat treatmentHigh frequency quenchingCarburizationSurface treatmentSand ... , GT0110, GARELLIESTR 10R, JUKI DRIB, SMASH110428 ybr125 motorcycle rear sprocket 428 ybr125 motorcycle rear sprocket