MUGEN MRX-5 Rear Upright 7075-T6 by Arrowmax AM-MRX5-H2124  [AM-MRX5-H2124]

Rear Upright details and role

This Arrowmax rear upright is an RC-scale replacement part machined from 7075-T6 aluminium intended for MUGEN MRX-5 platforms. The machined uprights are supplied with two sets of composite ring parts that interface with the pivot ball, increasing suspension sensitivity and promoting smoother articulation during compression and rebound.

Installed as a direct replacement for stock plastic uprights, these aluminium uprights change the chassis response: they slightly increase on-power understeer at corner exit compared with softer materials. That handling change is useful information when tuning toe, roll stiffness, or shock valving to recover rear traction.

Installation requires standard wheel hub disassembly and pivot ball retention hardware; no additional modifications are needed for MRX-5 fitment. When tuning, use the supplied composite rings to alter pivot compliance incrementally rather than making large setup changes.

For MRX-5 users seeking a durable metal upright and finer pivot-ball feel, this part offers measurable changes in suspension responsiveness and a predictable shift in rear traction under power.