RK ZXW Series were developed to meet the spec of the latest models of extreme superbike 1000cc and above. RK ZXW series features RK's only technology of XW-Ring, which has 2 lubrication pools and 3 contact lips, a triple barrier structure to further seal the lubrication and prevent debris to enter the chain. RK ZXW Series are designed to be the strongest, long-lasting chain available on today's market, with highest tensile strength of RK series and high rigidity for instant respond on acceleration.