power transmission chain 420H as motorbike; 1)OEM offered 2)chain type:ISO/ ANSI/JIS/B series 3)suitable for many motorcycle Roller chains1,chain material:40mn2,the roller chain quality have A,B,C three grade3,Original Equipment ManufactureIndustrial chain&Motorcycle chainWe are manufacturing all kinds of motorcycle chains ,satandard or OEM are accepted 1)Type :420,420H,428,428H,530,630 and so on ...