RK 520 chain clip hook

RK is the leading manufacturer of motorcycle drive chains in Japan.

For over 40 years RK has supplied all major Japanese motorcycle manufacturers as original equipment.

It is also the first choice of many teams in RC racing, MotoGP, Motocross, or even the Paris-Dakar Rally.

RK XSO:

This is an improved version of O-ring chains. The special shape of the X-rings seals the chain at four points, preventing lubricant from escaping.

In addition, the X-ring serves as an extra lubricant reservoir. Chain life is extended by approximately 30%. This technology was developed by RR for the XW-Ring chain.

The X-ring chain

Four sealing points

Lubricant cannot escape

Life is compared to a chain of seals extended by 30%.

A further development of the X-rings are the XW-rings.