... P12.7MMRoller Diameter: Dr8.51MMAdaptive ISO Chain Number:0/8BAdaptive Chain: Chain 428 production informationspecificationback gear:38T/41T/43Tfront ... a motorcycle drive wheel, and power to the drive wheel through the chain.Generally speaking, the initiative chain wheel is ... design, develop, produce and trade including motorcycle chain wheel, driving chain, shock absorber, brake shoe, lights, pump ...