HPI Baja Rear Wheel Shaft Steel SBJ039R by GPM  [SBJ039R]

Rear axle shaft designed for HPI Baja

This steel rear wheel shaft, SBJ039R, is an aftermarket replacement part for HPI Baja models. It functions as the rotating axle interface at the rear hub, providing a robust mounting point for the wheel and transferring hub loads into the suspension and drivetrain.

The part is intended as a direct mechanical replacement to reduce axial play at the hub and to help maintain consistent wheel alignment under load. Inspect mating surfaces and wheel hexes during fit-up to confirm runout and clearance match your chassis requirements.

Installation notes: verify fit with the existing rear hub and wheel hex, swap any worn retaining pins or set screws, and confirm free rotation of the hub and bearings after fitment. Regular checks for wear and corrosion will keep handling predictable.

Choose this steel shaft when replacing worn rear axle hardware or when you need a straightforward aftermarket option for HPI Baja rear hub assemblies; always confirm fit before heavy use.