The BJ054 front upper arm is an aftermarket replacement engineered for the HPI Baja platform. It uses an aluminium alloy arm together with moulded nylon black ball ends to strike a balance between rigidity and smooth joint movement on uneven terrain.
This unit replaces the original plastic upper arm and is designed to fit stock suspension carriers and hubs without needing chassis modification. The nylon ball ends minimise binding during articulation while the alloy arm resists bend and flex during aggressive driving.
Fitment is straightforward for anyone experienced with suspension work: remove the wheel, detach the existing arm hardware, fit the new arm using current hinge pins or supplied mounts, then confirm steering clearance. After initial runs, recheck torque on fasteners and the seating of ball ends.
Choose this alloy upper arm to get steadier front geometry and lower joint wear, ideal when you want improved steering feel without altering the chassis layout.
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