... guaranteed 3 order one-stop service All parts of 520 roller chains are by special surface treatment On the tailor-made special ... 25000~30000kms, which is strict quality test result. 1.Motorcycle Roller Chains:25H (04CH), 415, 415H, 420, 420H, 428, 428H, 520, 520H ... , 06MC 2. O-Ring Motorcycle chains: 428SO,520SO,525SO,530SO3. Roller chains: A series and B series4. Silent chains: SC3,SC4,SC5,SC6,SC8 ...