RK is one of the leading manufacturers of motorcycle transmission chains in Japan. For over 40 years, RK has been supplying original equipment to all major Japanese motorcycle manufacturers. In racing, RK is the top choice for many MotoGP, motocross, and even Paris-Dakar Rally teams. RK XSO: This is an improved form of O-ring chains.
The unique shape of the X-ring chain is sealed at four sealing points, preventing lubricant from escaping. Additionally, the X-ring is used as an additional lubricant reservoir, extending the chain's lifespan by approximately 30%. This technique has been further developed in the RK XW-Ring chain. X-Ring chain - four sealing points - lubricant cannot escape.