RK is the leading manufacturer of motorbike drive chains in Japan. For more than 40 years, RK supplies all well-known Japanese motorcycle manufacturers as original equipment. Also in racing RK is the first choice of many teams in the MotoGP, in motocross or at the Paris-Dakar Rally. RK EXW: The high load on modern road machines led to the development of XW-Ring chains. The XW ring has six sealing points, as well as two stabilizers that prevent the ring from turning under extreme load. This avoids the loss of lubricant under all conditions - the service life is extended by up to 50% compared to an O-ring chain. - with XW-rings for a longer life in the field - Six sealing points, two stabilizers prevent twisting of the rings - Loss of lubricant is avoided - 50% longer life than O-ring chain - for the ATV / quad and off-road area