D.I.D 520Vm X-Ring Sealed Chains

1.5 to 2 Times Longer Wear Resistance
(Compared with normal O-Ring) The X-Ring's four contact points greatly increase its sealing performance. This keeps the dirt out and the lubrication in much better than any other O-Ring. X-Rings have the greatest wear resistance of any other type of O-Ring or Non-O-Ring chain.

Half the Power Loss
(Compared with normal O-Ring) D.I.D's patented X-Ring? construction reduces friction by twisting between the side plates instead of being squashed. Normal O-Rings and other makers' modified O-Rings have squashed points that increase friction. The twisting action of the X-Ring? disperses the pressure and minimizes power loss.

Available Sizes:

• 520VMX 120 Gold/Black - W/ 690-34120
• 520VM X 130 Gold/Black - W/ 690-34130
• 520VM x 150 Gold/Black - W/ 690-34150