Product overview precision 48DP pinion gear set for RC cars, offered in 16T, 17T, 18T, and 19T options to give you precise control over gear ratio and vehicle performance. Machined for low noise and smooth engagement. Key specifications Pitch: 48DP (48P). Ensure spur gear uses the same pitch or teeth will not mesh. Teeth options: 16T, 17T, 18T, 19T. Choose the tooth count to adjust acceleration and speed. Gear aperture: 3.175 mm / 1/8 inch. Gear height: 9 mm / 0.35 inch. Material: quality 7075 aluminum for durability and repeated use. Note: some hardened steel pinions are intended to work only with steel spur gears and will not work with plastic or aluminum spur gears. Fitment and compatibility: Designed for RC car applications that accept 48DP pinion gears and a 3.175 mm bore. Always confirm spur gear pitch and material compatibility before installation. What makes this set useful Direct control of gear ratio: Multiple tooth counts let you fine tune acceleration versus speed for different tracks and driving styles. Smooth, quiet operation: Precise machining reduces roughness and noise for more consistent engagement and less drivetrain vibration. Durable construction: 7075 aluminum resists wear while remaining lightweight, helping maintain drivetrain balance and responsiveness. Complete mounting hardware: Includes grub screws and a hex key so you can install or swap pinions quickly. Installation and use tips Verify pitch: The pinion and spur gear must share the same 48DP pitch to mesh correctly. Start conservative: Begin with the smallest tooth count, run briefly, and monitor motor temperature. Gradually move to larger pinions if motor temperature and performance remain safe. Material pairing: If you are using hardened steel pinions, pair them with steel spur gears only. Do not use hardened steel pinions with plastic or aluminum spur gears to avoid damage. Practical applications Track tuning: Swap between the 16T to 19T pinions to tune an onroad RC car for tighter acceleration on short circuits or higher speed for long straights. Trail or basher setups: Use different pinion sizes to optimize torque and throttle response for offroad runs or heavier vehicles. Maintenance and replacement: worn pinions to restore smooth gear engagement and reduce drivetrain noise. Package contents 4 x 48DP pinion gears (16T, 17T, 18T, or 19T as selected) 4 x grub screws 1 x hex key Ordering notes Confirm spur gear pitch is 48DP and the bore size matches 3.175 mm / 1/8 inch before . Monitor motor temperature when changing gear ratios to avoid overheating and to achieve the desired balance of speed and reliability.