Rear Sprocket - Aluminum - 51 Tooth - Yamaha Introducing the combination of style, performance, and exclusivity, the Renthal? Limited Edition Hard Anodised Rear Chainwheel ing, With a limited edition run of Ultralight* Chainwheels, you can be sure that you are getting a truly unique product that will stand out from the crowd, As seen and used with top Renthal? riders at Round 14 of the Monster Energy Supercross Series in East Rutherford, NJ, Don't miss out on this exclusive opportunity to own a piece of Renthal? history, these parts are to sell out fast, and with available, once they're gone, they're gone, Order your limited edition Renthal? Hard Anodised Rear Chainwheels today and experience the in style, performance, and exclusivity, Renthal? UltraLight Rear Chainwheels are CNC machines from 7075 T6 aluminum to extremely tight tolerances, 66% lighter than steel, Computer engineered and tested to ensure a precise fitment, concentricity and load dispersion with tooth profiling to provide maximum power transfer