RK Gold 530 XSO-Z1 Series Chain. 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. This is an improved form of the O-ring chains. Due to the special shape of the X-rings, the chain is sealed at four sealing points, the lubricant can not escape. In addition, the X-ring serves as an additional lubricant reservoir. The life of the chain is extended by about 30%. This technique has been further developed into the XW ring chain at RK. 1x Gold RK 530 XSO-Z1 Series Chain. Pin Length: 24.9mm. Pin Diameter: 5.24mm. Plate Thickness – Inner: 2.4mm. Plate Thickness – Outer: 2.3mm. Tensile Strength (kgf): 4070kgf. Tensile Strength (kN): 40.7kN. Weight per 100 links: 1.98kg. You can send us a message by using the “Questions and answers” section towards the bottom of the page.