HPI Baja alloy front upper arm with nylon black ball ends by GPM BJ054  [BJ054]

Front upper arm for HPI Baja

This GPM BJ054 front upper arm is an aftermarket RC-scale replacement part made for the HPI Baja platform. It pairs an aluminum alloy arm with molded nylon black ball ends to provide a balance between structural stiffness and compliant joint behaviour under off-road loads.

The component replaces the stock plastic upper arm and is intended to mount to the stock suspension carriers and hubs without requiring chassis modification. The nylon ball ends reduce binding at pivot points while the alloy arm resists flex during hard cornering and jumps, contributing to more consistent steering feel.

Installation is straightforward for hobbyists familiar with basic suspension work: remove the wheel and disconnect the existing upper arm hardware, transfer any existing hinge pins or use the supplied mounting points, and verify clearance through the steering sweep. Check all fasteners and ball-end seating after the first few runs and retorque as needed.

As a replacement part, this alloy front upper arm focuses on repeatable suspension geometry and reduced wear at the ball joint interface; use it when seeking a firmer front end response without extensive chassis changes.