HPI Baja 18T Steel Pinion Gear by GPM SBJ018T  [SBJ018T]

Pinion gear for HPI Baja

The GPM SBJ018T is an aftermarket 18-tooth steel pinion gear designed for HPI Baja models, offered as a direct replacement part for drivetrain maintenance and tuning. Built in steel, this pinion focuses on wear resistance and consistent tooth engagement to support reliable power transfer between the motor and spur gear in off-road RC setups.

Compatibility with HPI Baja platforms makes this pinion suitable for hobbyists who perform regular drivetrain servicing or who adjust gear ratios for different surfaces. The 18T tooth count is commonly used for balanced acceleration and top speed; selecting this pinion is part of matching motor characteristics, spur gear size, and final drive requirements.

Installation notes: ensure the pinion meshes cleanly with the spur gear, check center-to-center spacing, and confirm motor shaft fitment before final mounting. Inspect tooth contact across several wheel rotations at low speed and tighten set screws to manufacturer torque recommendations for the motor shaft material. Periodic inspection of tooth wear and runout will help maintain drivetrain efficiency.

Use this steel pinion when you need a durable replacement for HPI Baja drivetrains and when testing alternate gear ratios for performance tuning.