RK's XRE series chains are the successor to XSO chains. Compared to XSO, XRE series chains feature a 20% longer wear life. XRE chains include XW-sealing rings, which provide two lubrication pools that help protect against high-speed abrasion and prevent dirt and debris from penetrating the inner rollers/bushings of the chain. XRE series chains are available in 428, 520, 525, & 530 pitches. XRE's features create a perfect balance between high tensile strength and lightweight while maximising wear life.