Renthal C270 R1 Non-O-Ring Chain 428-126L Works ChainRenthal C270 R1 Non O Ring Chain 428 126L Works Chain R1 MX Chain Renthal 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