Twisting action of the X-Ring increases its sealing performance and its four contact points minimizes power loss, ZVM-X Series utilizes D.I.D's patented X-Ring seal and has greater strength than the VX Series and is designed for heavyweight motorcycles with tremendous torque and horsepower, ZVM-X Seriesﾒ Direct Energy Transfer, born from our experience in MotoGP, means greater stretch resistance under load, ZVM-X chain is a great chain for high powered street bikes but may also be utilized on adventure bikes