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

Replacement pinion tailored to HPI Baja

The SBJ018T is an 18-tooth steel pinion supplied as an aftermarket replacement for HPI Baja vehicles. Its steel construction emphasises longevity and consistent gear engagement to ensure steady transfer of drive torque from motor to spur in off-road conditions.

Designed with HPI Baja compatibility in mind, this pinion is ideal for model owners who change gear ratios for different surfaces or who routinely maintain their driveline. The 18T sizing is chosen for a balanced mix of acceleration and peak speed when paired with an appropriate spur and motor setup.

Fitting tips: check that the pinion meshes evenly with the spur, verify correct centre distance, and confirm motor shaft fit before locking the pinion in place. Slowly rotate wheels to observe tooth contact and tighten grub screws to the correct torque for your shaft material. Regular wear checks will keep the driveline running smoothly.

Choose this steel 18T pinion for durable replacement use on HPI Baja drivetrains and for controlled testing of alternate gear ratios.