The Renthal R4 chain has been specifically tailored for high-powered Sportbikes and street motorcycle applications. Available in 530, 525 and 520 pitches and a variety of link lengths, Renthal has a chain application for most street motorcycles.Renthal’s R4 SRS Road chain is a specially developed sealed ring chain utilizing Renthal’s Self Regulating Seal (SRS) technology to increase the service life of the chain in Street applications. The special SRS ring is pre-loaded during assembly creating a spring effect.