RK Gold 520 ZXW Series Chain and Sprocket Kit. For more than 40 years, RK has been supplying all major Japanese motorcycle manufacturers with original equipment. Even in racing, RK is the first choice of many teams in the MotoGP, the motocross or the Paris-Dakar Rally. The ZXW chain is a further development of the GXW series to meet the needs of PS-strong street motorcycles of the latest generation and is characterized by an extremely high tensile strength. The special shape of the XW rings seals the chain at six sealing points, avoiding the loss of lubricant under all conditions - extending the service life by up to 50% compared to an O-ring chain.1x Gold RK 520 ZXW Series Chain. Product Type: Chain and Sprocket Kit. Plate Thickness - Inner: 2.2mm. Plate Thickness - Outer: 2.2mm. Tensile Strength (kN): 42.8kN. Weight per 100 links: 1.78kg. You can send us a message by using the "Questions and answers" section towards the bottom of the page.