DID Chain 525 Pitch * 108 Links

We strongly recommend the X-Ring for most purposes:- Here is some info towards help you selecting your chain:- 

Compared with Normal O-Ring, X Ring has:- 

• Half the Power Loss  
• 1.5 to 2 Times Longer Wear Resistance

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. X-Ring is a U.S.A. Registered Trademark of D.I.D; Daido Kogyo Co. Ltd. Japan

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.

D.I.D’S SUPER STREET SERIES (ZVM-X):- 

Designed with increased power transfer from the engine to the ground, greater resistance to stretching under load and overall improved performance that meets the demands of current large displacement street bikes and the people who ride them. D.I.D's ZVM-X chains are the strongest high mileage chains.