Motorcycle Roller Chain 1.material: 40Mn 2.heat-treatment 3.competitive price 4.OEM service Motorcycle Roller Chain 1.material: 40Mn 2.heat-treatment 3.competitive price 4.OEM servicesize:25H,415H,420,420H,428,520,520H,525,525H,530,530H,630,428HV-O,520HV-O,525HV-O,530HV-O,428HV-X,520HV-X,525HV-X,530HV-X. 420/428 motorcycle chain