... hardening Dear customers, motorcycle roller chain 520 is for motorcycle TRANSMISSION SYSTEM.Roller chain Quality is vital for riding safety. As motorcycle ... 25000~30000kms, which is strict quality test result. 1.Motorcycle Roller Chains:25H (04CH), 415, 415H, 420, 420H, 428, ... chains Model428 428H 420 520 520h 530 etc ItemMotorcycle Roller chain Motorcycle drive chain GearFront 13T 14T 15T 16T ...