RK Racing Chain 1102-048RB Black Aluminum Rear Sprocket and 520GXW Chain 520 Race Conversion Kit Fits: Honda CBR1000RR 04-05/06-07 520 Race Conversion Kit contains: 15 tooth chromoly front sprocket; 41 tooth black 7075 T6 aluminum rear sprocket; RK 520GXW-114 link chain Sealed XW-ring chain features heat treated hi-carbon alloy steel components with seamless rollers and shouldered bushings providing the user with a 50 percent longer wear life than basic O-ring chains XW-ring uses an advanced Nitrile Butadiene composite and features 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 and include a clip type master link