HPI Baja Front Lower Arm Steel Balls BJ055/BALL by GPM  [BJ055/BALL]

Front lower arm replacement balls

These hardened steel balls are a direct replacement set for use with HPI Baja alloy front lower arm assemblies. They serve as the rolling contact inside the lower arm joint and are supplied as an aftermarket spare under model BJ055/BALL, intended for routine maintenance or renewal of worn ball seating.

Compatibility note: these parts are intended for HPI Baja front lower arm assemblies that accept removable steel ball elements. Verify the ball seat design on your arms before assuming fitment on non-HPI or alternative arm designs.

Installation overview: remove the worn or damaged balls from the lower arm bore, inspect mating surfaces for wear or flattening, press the new balls into the seat, then cycle the arm through its travel to confirm free articulation. Use a light lubricant only if the original assembly specifies it, and check there is no excessive lateral play.

Tuning role: replacing worn steel balls restores the intended contact geometry at the front lower arm pivot, which helps reduce steering play and keeps suspension articulation predictable. Use these parts as maintenance items rather than a performance upgrade.