The GPM TRX4010T 10T steel pinion is engineered to strengthen the TRX4 drivetrain while preserving accurate gear engagement. Manufactured from hardened steel #45, the pinion is specified for improved wear resistance and sustained performance under repetitive load cycles. It is compatible with motors that have a middle hole of 3.175mm, a tooth distance of 0.8mm, and a 32 pitch gear train.