Robinson Racing 2039 Hard 5mm Bore 48 Pitch Machined Pinion 39T

HARD STEEL PINION GEARS Hard steel pinions are precision machined and stamped with the number of teeth. One 4 m/m set screw included. 2 m/m allen wrench (NOT INLUDED) fits the 4 m/m set screw. Can be run on cars using a 5 m/m motor shaft including Traxxas, Associated, and HPI models. TECH NOTE: RRP#1200 5 m/m to 1/8 inch Reducer Sleeve required for 1/8 inch shaft motors.