RK Racing Chain 525GXW-122 122-Links XW-Ring Chain with Connecting Link Sealed XW-ring chain features heat treated hi-carbon alloy steel components with seamless rollers and shouldered bushings XW-ring is made of an advanced Nitrile Butadiene composite featuring three contact lips and two convex outer stabilizers. This means three lubrication pools to protect against high speed abrasion, extreme heat build up, torsional flex and loss of lubricant XW-Ring chains are the best high-speed, extreme heat performance chains available today The XW-ring provides the user with a 50% longer wear life than basic o-ring chains 525GXW has a maximum tensile strength rated at 9,300 foot lbs and is suitable for up to 1100cc street bikes and 800cc dirt bikes