The GPM TRX4013T is a hardened steel #45 13T pinion engineered for robust service in TRX4 crawlers. Its centre bore measures 3.175mm, tooth spacing is 0.8mm and it is cut to a 32 pitch to ensure correct engagement with standard TRX4 motor shafts. Use this pinion where increased wear resistance and repeatable gear mesh are required for dependable drivetrain performance.