HPI Baja Rear Aluminum Knuckle Arm BJ022 by GPM  [BJ022]

Aluminum rear knuckle arm for HPI Baja platforms

This alloy rear knuckle arm is a scale replacement designed for HPI Baja buggies and identified as model BJ022. It swaps the factory knuckle for a machined aluminum unit to increase rigidity and provide a consistent mounting face for the rear hub and suspension link points.

In use the component alters how forces pass through the rear suspension during acceleration, braking and cornering. Hobbyists fit an alloy knuckle arm to reduce flex at attachment points, which helps keep toe and camber readings repeatable under load and makes tuning responses more consistent.

Fitting is straightforward for experienced builders: remove the stock knuckle, transfer bearings or bushings where compatible, then fasten the new aluminum arm to the hub and link mounts using the original hardware. Check for interference, confirm free wheel spin and full suspension travel before running. This part is intended as an upgrade for setup and maintenance rather than a geometry change.

Select this aluminum rear knuckle arm when you want stiffer mounting points and more consistent rear suspension behaviour for setup work and routine maintenance on HPI Baja buggies.