Rear Sprocket - Aluminum - 51 Tooth - KTM/Husqvarna/Gas Gas 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, 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