HPI Baja 16T & 18T Hardened Pinions 5mm Shaft - SBJ01618TO by GPM  [SBJ01618TO]

HPI Baja Steel Pinion 16T & 18T With 5mm Bore, Profile Regraded, Both For Use With Stock Spur Gear Or Sbj057T - 2pcs set - GPM SBJ01618TO
Price:
AUD$28.26
Brand:
GPM
Model:
SBJ01618TO
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Pair of hardened pinions for HPI Baja

This two-piece set contains a 16-tooth and an 18-tooth steel pinion made for HPI Baja style drivetrains. Each pinion has a 5mm bore and a regraded profile to engage the stock spur gear or SBJ057T in typical installations. The set is ideal for quick swaps to experiment with acceleration and top speed without changing the spur gear itself.

Steel gears offer improved resistance to wear versus softer alternatives and are suitable for standard torque ranges encountered in mixed off-road use. The small tooth-count difference between the two pinions provides a practical way to dial in final drive on the bench or at the track.

Compatible Models

  • Stock Spur Gear
  • Sbj057T

Install these pinions to adjust drive ratio on HPI Baja setups, confirm proper mesh and backlash before running, and replace degraded pinions with hardened-steel units.

Will these work with my stock motor shaft?

If your motor has a 5mm shaft these pinions will fit; confirm the shaft diameter before pressing the gear on.

Do I need a new spur to use them?

No, they are regraded to mesh with the stock spur or SBJ057T, though you should always set correct pinion height and backlash.

What maintenance do steel pinions need?

Check mesh and wear periodically, keep bearings and motor shaft clean, and replace pinions when teeth show rounding or chipping.

Are shims required for fitment?

Some motor mounts require small shims to set ideal mesh; use a thin shim or adjust the motor plate until a smooth gear engagement is achieved.

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