D.I.D Chain - 525ZVMX Racetrack ChainThe ZVMX X Ring Series with Greater Rigidity D. I. Ds ZVM X Series has greater strength than the VX Series and is designed for heavy weight motorcycles with tremendous Torque and horsepower. The twisting action of the X Ring increases its sealing performance and its four contact points minimize power loss. The ZVM X Series' Direct Energy Transfer, born from our experience in MotoGP, means greater stretch resistance under load.