This GPM chrome steel front gear is specified for the Traxxas X-MAXX and engineered for durability, featuring a hardness rating of 50 and a 13-tooth spiral design to reduce tooth stress during launch and braking. The spiral profile provides predictable engagement and extends service life compared with lower grade steels. Intended for use with the spiral main gear (STXM1200FR/G); it will not fit stock low-grade steel gears.