Pinion Gear 21T, RC drivetrain accessory

A 21T pinion gear is a small part with a direct effect on how an RC drivetrain comes together. This version uses a module 0.6 tooth profile and steel construction, giving model-building enthusiasts a clearly defined replacement part for compatible drive systems. The gear is designed with a central bore for mounting on a shaft and a side threaded hole for the included grub screw. That fastening method matters in practice, because the screw fixes the gear on the shaft instead of relying on a push fit alone. The evenly cut teeth are made to mesh with a matching module 0.6 gear, which is the key detail when replacing a worn drivetrain part or preparing a fresh setup. In workshop use, the 21T count is also a concrete selection point when an existing transmission calls for the same specification. This accessory fits naturally into repair work, maintenance sessions and parts storage for RC models that use the matching format. On the bench, it supports a clean swap when a drive component needs replacement, and in a tuning collection it serves as a defined steel gear option for compatible assemblies.

 

Warning! Not suitable for children under 14 years.