When conditions turn muddy, sandy, wet, or if riders just want a long lasting racing chain, RK offers a sealed supercross, motocross and off-road racing chain called MXU. RK's GB520MXU features ultra-thin UW-seals which is perfect for bikes with narrow...

Cannot be used with the CRF250R/X due to clearance

Advanced RK XW-ring offers three lubrication barriers to reduce friction and heat to offer longer wear resistance.

Anti-stretch chromium pin treatment 10% higher tensile strength

Heavy duty MXZ Mini Racing chains made for mini MX and SX racing. MXZ chains feature Chromoly steel construction with seamless rollers and bushings, and oversized special alloy pins for added strength.

Maximum tensile strength of 5,800 lbs

Used by professional SX and MX race teams the MXZ chain features high-quality pins, bushings and rollers for maximum durability. Narrow, lightweight chain with 4-point riveted pins. Longer wear life than RK Standard Chain.

Rivet-type connecting link for 520ZXW chains.

Features XW type seals, which provide better internal lubrication sealing for extended chain life.

RK's XRE series chains are the successor to XSO chains. Compared to XSO, XRE series chains feature a 20% longer wearlife. XRE chains include XW-sealing rings which provide two lubrication pools which help protect against high speed abrasion and prevent...

Connecting Link for 530 KS - Ring Chain.

RK non-sealed chains perfect for low displacement motorcycles that did not come from the factory with sealed chains. If the motorcycle came from the factory with a sealed chain, then RK recommends always replacing it with a sealed chain.