ARRMA/TRAXXAS 1/8-scale 20T Pinion Gear by GPM MG5020TS  [MG5020TS]

Pinion gear for 1/8-scale ARRMA/TRAXXAS

This GPM MG5020TS pinion is an RC-scale replacement designed for 1/8-scale ARRMA and TRAXXAS applications, focused on durable, consistent power transfer in model drivetrains. The gear is manufactured from 20Cr steel and finished with a hardened black treatment to increase wear resistance compared with standard stamped or softer alloys.

Key mechanical details provided by the source include a 20-tooth count, 1.0mm module, and a motor tooth diameter (bore) of 5.0mm in a round-hole format. The part secures to the motor shaft using two set screws sized 4x4, making it compatible with motors that accept that bore and module combination. Before purchasing, verify your motor and gearbox pinion parameters to ensure correct fitment.

In tuning and gearing changes this pinion serves as a straightforward, robust option where higher wear resistance and consistent mesh are priorities. It is intended for model-level use only and should be selected based on matching module, bore, and tooth count to your existing spur gear and motor flange setup.