RK is the leading manufacturer of motorcycle drive chains in Japan. For more than 40 years, RK has supplied original equipment to all of the best-known Japanese motorcycle manufacturers. Also in racing, RK is the first choice of many teams in MotoGP, Motocross and the Paris-Dakar Rally.
RK MXU:
A special shape of the o-ring for MX racing. Due to the flat shape of the ring and the small dimensions, the chain remains very thin and light, however, lubricant is prevented from escaping during the stroke.