RK's ZXW series is used for both racing and general use, featuring MotoGP and FIM Suzuka 8 Hour Endurance technology and has proven superiority by winning 35 first place finishes out of 39 races at the FIM Suzuki 8 Hour Endurance Race.. RK's ZXW series chains are ideal for high-speed, high-horsepower performance applications, large displacement and extended swingarm machines. RK's XW-Ring seals provides three contact lips and two lubrication pools to protect against dirt and debris, high-speed abrasion, heat buildup and the loss of lubricant under extreme conditions (That's a fancy way of saying XW-Ring seals make your chain last longer). Available in 520, 525 and 530 pitch and choose from either Gold, Black Scale, Chrome, Red, Blue or Green finish. 520ZXW XW-Ring Specs: Tensile Strength: 9,450 lbs, MAX CC Racing: 1,200cc, MAX Horsepower: 200 HP, Weight: 3.92 lbs, Max Chain Width: 20.9mm, Master Link Included: Rivet Type.