Rk gb520ruwr uw-ringchain (only for racing -600cc) | RK Japan

Product description

RK Racing Chain Series apply RK’s only technology of Ultra Thin Seal, U-Rings or UW-Rings, where the thickness of seal is less than 50% of the common seal, make it possible to design a Sealed Chain with the weight of a Non-Sealed Chain.
RK Racing Chain Series are designed strictly for Racing ONLY, Do not apply them for Street Use.