Surpass Hobby 48P Pinion Gear Set 5-Pack (18T-22T) for 1/10 RC Cars with Hex Key
Surpass Hobby 48P Pinion Gear Set 5-Pack (18T-22T) for 1/10 RC Cars with Hex Key
This Surpass Hobby pinion gear set includes five 48-pitch gears with tooth counts from 18 to 22, each with a 3.175mm bore designed for 1/10 scale RC car motors. The set comes with matching grub screws and a hex key for straightforward installation. It's a flexible way to test different gear ratios on your RC car.
What does the Surpass 48P pinion gear set include?
You get five hardened steel pinion gears: 18T, 19T, 20T, 21T, and 22T. Each gear has a 48 DP (diametral pitch) and a 3.175mm shaft hole. The package also contains five grub screws and one hex key, so you have everything needed to swap gears on your RC car's motor shaft.
Understanding 48 pitch and 3.175mm bore
Pinion gears must match the pitch of your spur gear for proper meshing. A 48-pitch (48P) pinion works only with 48-pitch spur gears. The 3.175mm bore fits standard 1/10 scale RC car motor shafts. Before installing, confirm that your spur gear is also 48 pitch and your motor shaft diameter is 3.175mm.
Technical specifications
| Pitch | 48 DP |
| Bore diameter | 3.175mm |
| Tooth counts | 18, 19, 20, 21, 22 |
| Material | Hardened steel |
| Machining | CNC |
| Quantity | 5 gears, 5 grub screws, 1 hex key |
How to choose the right tooth count for your RC car?
Changing the pinion gear alters your gear ratio, which directly affects acceleration and top speed. A smaller pinion (like 18T) gives more torque for quicker acceleration but lower top speed. A larger pinion (like 22T) does the opposite, increasing speed while reducing torque. Starting with the 18T gear and moving up lets you experiment to find the balance that suits your driving style and track conditions.
Frequently asked questions
Will these gears fit my Traxxas or Arrma RC car?
These pinions are designed for 1/10 scale cars with 48-pitch spur gears and 3.175mm motor shafts. Many brands like Traxxas, Redcat, Tamiya, Losi, and Arrma use this standard on certain models, but always double-check your spur gear's pitch and shaft size before buying.
What's the difference between 48P and 32P gears?
48P (48 pitch) means more teeth per inch of diameter, resulting in smaller teeth. 32P has fewer, larger teeth. They are not interchangeable; your spur gear must match the pinion pitch. This set is 48P only.
Are the grub screws and hex key included?
Yes. Each gear comes with a grub screw, and the set includes a hex key for tightening them onto the motor shaft.