HPI Baja steel pinion 16T & 18T with 5mm bore by GPM SBJ01618TO  [SBJ01618TO]

Steel pinion set for HPI Baja

This is an RC-scale steel pinion set intended for HPI Baja platforms, supplied as a 2pcs set. Each pinion matches common motor shaft standards with a 5mm bore and is profile regraded to mesh with the stock spur gear or the referenced SBJ057T spur. The parts are intended to alter gear ratio choices for tuning acceleration versus top speed while keeping installation straightforward on compatible motor outputs.

The set contains one 16T and one 18T steel pinion, allowing a quick swap to test small changes in final drive ratio without modifying the spur gear. As steel pinions, they are suited for typical on-road and off-road RC torque loads where hardened material is preferred for wear resistance compared with softer materials.

Use these pinions to fine-tune acceleration and motor load on HPI Baja setups, verify gear mesh and set correct backlash before full-speed runs, and replace worn pinions with like-for-like steel replacements.