... P12.7MMRoller Diameter: Dr8.51MMAdaptive ISO Chain Number:0/8BAdaptive Chain: Chain 428 production informationspecificationback gear:38T/41T/43Tfront ... quality carbon structural steel, precision hobbing , their dimensions and machining accuracy was identified by the Technical ... design, develop, produce and trade including motorcycle chain wheel, driving chain, shock absorber, brake shoe, lights, pump ...