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

Alloy Front Lower Arm for HPI Baja

The GPM BJ055 front lower arm is a precision alloy replacement created for HPI Baja chassis. It is supplied as a direct-fit swap to replace worn or broken plastic arms while keeping the factory suspension mounting points intact.

As a suspension locating link, the lower arm controls wheel hub position and influences roll centre and camber changes during compression and rebound. Swapping to an alloy arm increases local stiffness at the pivot and provides a more solid mounting surface for ball studs and link points, which helps when refining suspension behaviour for rough tracks.

Fitment is straightforward for a modeller with basic workshop experience: remove the wheel and hub, free the existing lower arm hardware, move or renew link and pivot hardware if needed, install the GPM arm into the stock mounts, and check travel and alignment before track use. After fitting, cycle the steering and suspension through full travel to confirm there is no binding and that geometry matches your setup.

For HPI Baja owners wanting stronger front control arms, the GPM BJ055 offers an alloy option that supports tuning and longevity while preserving original mounting geometry.