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RK is the leading manufacturer of drive chains for motorcycles in Japan.
For more than 40 years, RK has supplied all well-known Japanese motorcycle manufacturers as original equipment.
Also in racing, RK is the first choice of many teams in MotoGP, motocross or even in the Paris-Dakar Rally.
RK XSO:
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 service life of the chain is extended by about 30%. This technology was further developed at RK to the XW-Ring chain.
- X-Ring chain
- Four sealing points
- Lubricant cannot escape
- Lifetime is extended by 30% compared to the O-ring chain
- Further development of the X-rings are the XW-rings




