Renthal R1 MX Chain 520Renthal R1 Chain is a high performance, lightweight, low friction, non o ring chain specifically engineered for racing at the highest levels. Often described as "the best motocross chain available", the R1 Chain has high resistance to elongation and severe abrupt stresses encountered in MX & SX racing. This is achieved by manipulating raw material composition to increase tensile strength and yield strength Each R1 Works Chain features chamfered inner