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

Front lower arm service balls

These hardened steel balls are supplied as a replacement set for HPI Baja alloy front lower arm assemblies. They form the rolling contact inside the lower arm joint and are offered as aftermarket spare parts under model BJ055/BALL for routine servicing or component renewal.

Compatibility advice: intended for HPI Baja front lower arm assemblies that accept removable steel ball elements. Do not assume fitment on non-HPI arms without checking the seat dimensions and design.

Fitment guide: remove the worn balls, inspect the ball seat and bore for damage, install the new balls and cycle the suspension to confirm smooth articulation. Apply light lubricant only if specified by the original assembly and verify there is no excessive play.

Maintenance role: renewing worn steel balls restores proper contact geometry at the lower arm pivot, helping to reduce steering play and preserve predictable suspension behaviour. Use these as maintenance items rather than tuning parts.