HPI Baja Steel Pinion 16T & 18T 5mm Bore - SBJ01618TO by GPM  [SBJ01618TO]

Steel pinion pair for HPI Baja tuning

This 2-piece steel pinion set is made for HPI Baja chassis use, supplied as one 16T and one 18T pinion. Each gear uses a 5mm bore to fit standard motor shafts and is profile regraded to mesh cleanly with the stock spur gear or the SBJ057T reference spur. These pinions let you tweak motor to spur ratio for a balance between sharper acceleration and higher top speed while keeping installation simple on compatible motor outputs.

The pair provides quick on-car swaps to test small ratio changes without altering the spur gear. Built in steel for improved wear resistance, these pinions suit common on-road and off-road torque loads where a hardened material performs better than softer alternatives.

Fit these pinions to fine-tune acceleration and motor loading on HPI Baja setups, confirm gear mesh and backlash before high-speed runs, and replace worn pinions with like-for-like steel items.