Arrowmax AM-MRX5-H2112 MUGEN MRX5 Front Upright Arm  [AM-MRX5-H2112]

Front upright arm for MRX-5

This Arrowmax AM-MRX5-H2112 front upright arm is an RC-scale replacement part designed for the MUGEN MRX5/MRX-5 chassis family. It serves as the mounting interface for the front wheel hub and steering linkages, and plays a direct role in toe and camber response when adjusting suspension geometry.

Fitment and installation are straightforward for users familiar with MRX-5 maintenance: remove the original upright, transfer any wheel bearings and steering inserts, and install this unit using the existing mounting hardware. Check link lengths and ball stud positions after installation to confirm original alignment and to avoid binding in the steering assembly.

In tuning contexts, the upright arm affects steering feel and front-end grip by altering scrub radius and the relationship between steering inputs and wheel camber under compression. Use it as part of progressive setup changes: change one element at a time and record adjustments to servo throw, steering link geometry, and suspension settings to evaluate handling differences on track.