DID motorcycle drive chain in 520 pitch with 116 links, carrying power from the front sprocket to the rear sprocket. The X-Ring is recommended for most purposes. D.I.D's patented X-Ring construction reduces friction by twisting between the side plates instead of being squashed, as normal O-Rings and other makers' modified O-Rings are. The twisting action disperses the pressure and minimizes power loss. Compared with a normal O-Ring, the X-Ring has half the power loss and 1.5 to 2 times longer wear resistance. Its four contact points greatly increase sealing performance, keeping dirt out and lubrication in, and X-Rings have the greatest wear resistance of any other type of O-Ring or Non-O-Ring chain. X-Ring is a U.S.A. Registered Trademark of D.I.D; Daido Kogyo Co. Ltd. Japan. Part numbers: VX3