The TRAXXAS X-MAXX Chrome Steel Rear Gear by GPM STXM1200R/G1 is produced from high-grade chrome steel with a measured hardness of 50 to provide consistent wear characteristics. Its 13-tooth spiral profile offers controlled tooth engagement and reduces shock loads during aggressive starts and sudden braking. Intended as a performance upgrade, this gear is compatible only with the spiral main gear (STXM1200FR/G) and is not compatible with conventional low-grade steel main gears, ensuring correct gear geometry and extended component life.