Drive chain RK ZXW pitch 525 colour black-scale for sport motorcycles. The ZXW chain is a development of the GXW series to meet the needs of the latest generation large displacement road bikes. It is built with the best materials in all its parts, including a high thermal resistance lubricant and “XW” type sealing rings, with six contact points, four lubricant deposit zones and two central stabilizing reinforcement ribs. These advanced solutions ensure longer chain life, up to 50% longer than O-Ring chains. It is the best RK chain available today for use at high speeds and operating temperatures.