RK BL420MRU U-ringchain Black&Gold +CL (Connect.link)

RK 420MRU and 428MRU2 chains are designed to be the Premium Replacement for OE Non-sealed Chain, featuring RK`s only technology of Ultra-Thin Seal, U Ring, make possible to design a Sealed Chain with the width of a Non-Sealed Chain.
RK 420MRU and 428MRU2 are an long lasting solution for daily business use vehicle or commute motorcycle.
RK 520MRU is the Lightest Multipurpose Sealed Chain specially designed for ~450cc, applicable to both Street Usage, securing 15,000[km] of chain life, and Track Usage, featuring high performance for the best lap time.
RK 520MRU features RK’s only technology of Ultra-Thin Seal, UW-Rings, minimizing the chain weight and friction loss possible.
Also, by narrowing the application from 125cc~450cc, each chain components are shaped up to its limit, making RK 520MRU as light as 13.8g/link, 10% lighter compare to RK 520XSO.
Converting Non-Sealed to a Sealed Chain result at least 4 times chain life and minimum chain adjustment after initial stretch, while ensuring high efficient horsepower transmission from the engine to the rear wheel throughout the chain life.