AIMROCK 5-Pack Mod 1 RC Motor Pinion Gears (15T-19T) for 5mm Shaft, Hardened Steel Upgrade
AIMROCK 5-Pack Mod 1 RC Motor Pinion Gears (15T-19T) for 5mm Shaft, Hardened Steel Upgrade
This AIMROCK 5-pack includes five Mod 1 pinion gears with 15, 16, 17, 18, and 19 teeth, each with a 5mm bore designed for 1/8 RC car motors. Made from hardened steel, they are intended for use with steel spur gears only. Ideal for upgrading or tuning the speed of Arrma Typhon, Kraton, Outcast 6s and similar 1/8 or 1/10 RC vehicles that use Mod 1 spur gears and a 5mm motor shaft.
Why the Material and Compatibility Matter
These pinion gears are constructed from hardened steel, a material chosen for its durability and resistance to wear under high loads. However, the manufacturer explicitly warns against assembling them with plastic or aluminum spur gears. Doing so can quickly damage or destroy your spur gear because the hardened steel teeth are much harder than those softer materials. For best results and longevity, pair these pinions with a steel spur gear of the same Mod 1 pitch.
Which Teeth Count for Your Setup?
The set provides five different tooth counts: 15T, 16T, 17T, 18T, and 19T. Changing the pinion gear is one of the easiest ways to adjust your RC car’s speed and acceleration. A lower tooth count (like 15T) gives more torque and quicker acceleration, while a higher tooth count (like 19T) increases top speed. Having five options lets you fine-tune your vehicle for different tracks, terrain, or driving styles without buying individual gears.
Pinion Gear Measurements at a Glance
| Pitch | Mod 1 (Module 1) |
| Inner Diameter (bore) | 5 mm |
| Teeth Options | 15, 16, 17, 18, 19 |
| Material | Hardened steel |
| Set Includes | 5 pinion gears, 5 grub screws, 1 steel hex key |
What Buyers Often Ask
Can I use these pinion gears with plastic or aluminum spur gears?
No. Because these are hardened steel, they should only be used with steel spur gears. Using them with plastic or aluminum spur gears will likely damage the spur gear.
Will these fit a 5mm motor shaft?
Yes, each pinion has a 5mm inner diameter bore, so they fit motors with a 5mm shaft.
What pitch must my spur gear be?
These pinions are Mod 1 pitch. They will only mesh properly with a Mod 1 spur gear. Check your spur gear’s pitch before ordering.
What comes in the package?
The set includes five pinion gears, five grub screws, and one steel hex key for installation.