Motorcycle chains and sprockets Rear gear:34T--57T Thickness: 6.5-7.0mm Motorcycle model: Yamaha, Honda, Suzuki. Motorcycle chains and sprockets Material: A3 steel, 45# steelSpecificationsModel:415,420,428,428H,520Front gear:13T--17TRear gear:34T--57TMotorcycle model: Yamaha, Honda, Suzuki.Heat treatmentHigh frequency quenching, CarburizationSurface treatmentSandblasting, painting, galvanized, ...