HPI Baja front lower arm steel balls by GPM BJ055/BALL  [BJ055/BALL]

Front lower arm steel balls

This is an RC-scale replacement set of steel balls intended for use with HPI Baja alloy front lower arm assemblies. The component serves as the rolling contact inside the lower arm joint and is supplied as an aftermarket spare by GPM under model BJ055/BALL. The parts are presented as direct replacement items for the front lower arm ball seating, intended for routine maintenance or part renewal on compatible HPI Baja setups.

Compatibility is limited to HPI Baja front lower arm assemblies that use removable steel ball elements; do not assume fitment on non-HPI designs without verification. This description does not add or change any original mounting interfaces.

Installation overview: remove the worn or damaged steel balls from the lower arm bore, inspect the mating surfaces for wear, then fit the new steel balls into the ball seat and check for free articulation through the arm travel. Apply a suitable light lubricant at the contact surface if the original assembly calls for it, and verify that the joint moves smoothly without excess play.

Tuning role: replacing worn steel balls restores the intended contact geometry at the front lower arm pivot, which helps reduce steering play and maintains predictable suspension articulation. Use replacements as part of routine upkeep rather than as a performance upgrade.