520UO O-Ring Colored Red Motorcycle Chain Our motorcycle chain meet or exceed DIN, ANSI,ISO,BS,JS standard ... , and stand up to the Our motorcycle chain meet or exceed DIN, ANSI,ISO,BS,JS standard, ... with you in the near futureGeneral Standard for Roller Chain:ROLLERSolid RollerMaterial 1035,1045 or 1050Through harden with surface ... peening per the spec 520UO O-Ring Colored Red Motorcycle Chain