GPM Racing 40CR Steel Motor Gear 20T (MG5020TS)

Aftermarket 1/8 pinion overview

The MG5020TS serves as an aftermarket replacement pinion for 1/8-scale ARRMA and TRAXXAS applications, intended to provide reliable power transfer in model drivetrains. It is produced from 20Cr steel and given a hardened black finish to improve resistance to wear compared with some softer pinion options.

Manufacturer details indicate a 20-tooth configuration, a 1.0mm module, and a 5.0mm round motor bore. The part uses two 4x4 set screws to clamp onto the motor shaft; check your motor and spur gear parameters before fitting to ensure proper fitment.

As a tuning component this pinion offers a durable choice for those prioritising consistent mesh and longevity. Confirm module, bore, and tooth count compatibility with your current spur and motor flange before installation.

Compatible Models

• 1/8-scale ARRMA models
• 1/8-scale TRAXXAS models

Can I adapt this pinion if my motor bore differs from 5.0mm?

If your motor bore differs you can use a suitable adapter or hub that matches the 5.0mm round-bore pinion, or consider modifying the motor flange where safe. Always ensure the finished assembly runs true to avoid premature wear.

What routine checks help prolong pinion life?

Regularly inspect gear teeth for wear, confirm set screw tightness after initial runs, and maintain correct mesh clearance. These simple checks help the hardened finish perform as intended. Write Product Review Please sign in your account before you can write any review. Sign In Close

Made to order: GPM Racing parts are shipped to us from GPM's factory, so please allow around 14 days for dispatch.