Renthal UltraLight rear wheels are CNC-machined from 7075 T6 aluminum to extremely tight tolerances, 66% lighter than steel. Computer-engineered and tested to ensure precise fit, concentricity, and load dispersion with tooth profiles for maximum power transfer. A combination of high-strength base material, cutting-edge manufacturing methods, and exceptional surface treatments, it's clear to see why Renthal's lightweight aluminum front wheels can be found on the rear wheels of many factory team machines.