Traxxas Gear 21-T Pinion 48-Pitch Screw SetGear, 21 T pinion (48 pitch) set screw. Optional Traxxas pinion gears allow you to increase or decrease the final drive ratio and tune for different applications. Larger gears will result in higher speeds while smaller gears provide more torque. These are designed for use with 48 pitch spur gears and 3mm motor shafts. Use Traxxas stock and hop up replacement parts to get the most out of your Traxxas RTR vehicles. This product is made from high quality