HPI Baja Rear Upper Arm Alloy Nylon Ball Ends BJ057 by GPM  [BJ057]

Upper rear arm designed for HPI Baja

The BJ057 rear upper arm is an alloy replacement part made for HPI Baja vehicles, fitted with black nylon ball ends as described in the product designation. It serves as either a direct spare or an upgraded rear linkage while maintaining the common ball end and mounting layouts used on Baja rigs.

The alloy body increases stiffness to keep link geometry stable, and the nylon ball ends deliver fade-resistant bearing at pivot points. Installation usually involves disassembling the rear linkage, reusing compatible fasteners, and verifying clearance around shock towers and hub assemblies. Confirm that retaining screws engage properly and that ball end movement is free without excess play.

When tuning, remember that any change in arm length or mounting location will influence toe and camber; if BJ057 matches stock geometry the handling impact will be limited. Regular checks for wear at the ball sockets are recommended, with replacement when looseness or damage is noticed.

Choose BJ057 for a robust alloy upper rear linkage on HPI Baja machines and perform alignment checks after fitting to maintain predictable handling.