RK CHAIN RK520ZXW GG 118R GB520ZXW-118-CLFDeveloped to meet the spec of the latest models of extreme superbike., Features RKs only technology of XW Ring., 2 lubrication pools and 3 contact lips., Triple barrier structure to further seal the lubrication and prevent debris to enter the chain., Designed to be the strongest, long lasting chain available on todays market., Highest tensile strength of all RK series and high rigidity for instant respond on acceleration.