This is a replacement JQ Products 49 Tooth Main Gear. This gear is part of the next evolution of JQ gearing, now called "THE Even Smoother Gearing Set" (JQP-S-0036). This gearing has even smoother and more controllable acceleration, less wheel spin and better overall throttle control. A must have for all racers! Developed to help drivers apply the power of their engine in the efficient way possible.