HPI Baja Rear Axle Shaft SBJ039R Steel Upgrade by GPM  [SBJ039R]

Rear shaft solution for HPI Baja

The SBJ039R steel rear wheel shaft is supplied as an aftermarket replacement for HPI Baja chassis. It acts as the rotating axle interface at the rear hub, securing the wheel and transferring loads into the suspension and drivetrain components.

The design purpose is straightforward mechanical replacement and tuning work: a stiffer shaft reduces axial slack at the hub and aids repeatable wheel alignment when under stress. Always check mating surfaces and wheel hex tolerances during assembly to avoid binding or excess play.

Fitting tips: confirm the shaft seats correctly in your rear hub and wheel hex, renew any worn retaining pins or set screws, and verify the hub spins freely with bearings fitted. Regular maintenance will reduce the chance of unexpected wear.

Use SBJ039R when a durable, no-frills steel replacement is needed for HPI Baja rear hubs; double-check dimensions before track use.