ZVM-X2 ChainThe D.I.D ZVM-X Series utilizes our patented X-Ring seal and has greater strength than the VX Series and is designed for heavyweight motorcycles with tremendous torque and horsepower.The twisting action of the X-Ring® increases its sealing performance and its four contact points minimizes power loss.The ZVM-X Series’ Direct Energy Transfer, born from our experience in MotoGP, means greater stretch resistance under load.The ZVM-X chain is a great chain for high powered street bikes but may also be utilized on adventure bikes. ZVM-X and ZVM-X2 CONNECTING LINKS AREN'T INTERCHANGABLE** (Varying pin lengths)