"text-align:Leftfont-family:Tahomafont-style:normalfont-weight:normalfont-size:11px000000" RK is the leading manufacturer of drive chains for motorcycles in Japan. For more than 40 years RK has supplied all the major Japanese motorcycle manufacturers as original equipment. Even in RC racing it is the first choice of many teams in MotoGP, motocross or even at the Paris-Dakar rally. RK XSO: Here is an improved form of O-ring chains. Due to the special shape of the X-rings, the chain is sealed at four sealing points, the lubricant cannot escape. Furthermore, the X-ring is used as an additional lubricant reservoir. Chain life extends by approximately 30%. This technique was developed in RK for XW-Ring chain. - X-ring chain - Four sealing points - Lubricant cannot escape - Life is compared to O-ring chain extended by 30% - Further development of the X-rings are the XW-rings