HPI Baja Front Lower Arm Precision Alloy BJ055 by GPM  [BJ055]

Precision Lower Arm for HPI Baja

The GPM BJ055 is an alloy front lower arm made to replace the standard plastic component on HPI Baja vehicles. It installs into the stock suspension mounts and is intended as a direct replacement for damaged or fatigued arms.

Functionally the lower arm sets hub location and affects roll and camber behaviour during bumps and landings. An alloy arm changes local stiffness and gives a more reliable seating for ball joints and link holes, which many tuners use to refine the chassis response on loose or rough terrain.

Installation follows typical arm replacement steps: remove wheel and hub, unbolt the old arm, move or replace linkage hardware if needed, fit the BJ055 into the factory mounting points and reassemble. Once fitted, move the suspension through its full range to check for interference and to confirm alignment remains correct.

For tuners wanting a metal front arm on an HPI Baja, the GPM BJ055 is a simple, durable upgrade that keeps factory geometry while improving durability.