... .OEM 1.The service life of O-Ring or X-Ring Chain is greatly depended on the wearing ... -shaft and the sleeve. The "O" ring or “X” ring will greatly reduce the wearing and thus prolongthe ... ,630VM-X,420HZ,428HZ,520NZ,525HZ,530HZ,630HT3.Color:self,gold,nickel,blue,red,orange,green,yellow ... 9.The sealing performance of X-ring is better than O-ring. color O-ring motorcycle chain for racing motorcycles Verified ...