... use2)Deliver in time3)Iso9001certificate of quality and quantity motorcycle sprocket SpecificationsFront:12T/13T/14T/15T/16T/17TRear:35T/36T ... 49T/50T/51T/52T/53T/54TChain:420,428,428H,415,520,530MaterialA3 steel45#steelHeat treatmentHigh frequency quenchingCarburizationSurface treatmentSand blastingDull ... B series (9.525-50.8mm pitches)2)motorcycle chains :415,415H,420,420H,428,428H,520,520H,6303)short ...