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

Rear wheel shaft for HPI Baja

This steel rear wheel shaft is an RC-scale replacement part intended for HPI Baja models, supplied as an aftermarket option by GPM (SBJ039R). It serves as the rotating axle interface at the rear hub, providing a durable mounting point for the wheel and transferring hub loads into the suspension and drivetrain components.

Design intent focuses on plain mechanical replacement and tuning: a stiffer shaft can reduce axial play at the hub and promote more consistent wheel alignment under load. Inspect mating surfaces and wheel hexes during fit-up to ensure runout and clearance meet your chassis tolerances.

Installation notes: confirm fit with existing rear hub and wheel hex, replace any worn retaining pins or set screws, and verify free rotation through the hub with bearings in place. Periodic inspection for corrosion and wear will maintain predictable handling characteristics.

Use this shaft when replacing worn rear axle hardware or when seeking a straightforward, steel aftermarket option for HPI Baja rear hub assemblies; verify fit before full-track use.