Tamiya M1025 Hummer Front Lower Arm HM1055 Aluminium Tuning Part by GPM  [HM1055]

Front lower arm briefing

This aluminium front lower suspension arm is an aftermarket swap for the Tamiya M1025 Hummer, manufactured by GPM and sold as 1 pr. It is built to replace the stock plastic lower arm on compatible M1025 chassis without changing original mounting geometry.

The component is intended for tuning purposes, stiffening the lower link and changing steering feedback rather than adding extra features. Installation will usually require removing the wheel hub and existing arm fasteners, and either reusing those fasteners or installing new ones if needed.

Fit this arm when you need a firmer baseline to limit flex under load and maintain consistent suspension pivoting during scale off-road runs. After fitting, re-evaluate shock settings and ride height to compensate for the increased rigidity.

If you are swapping out a broken plastic arm or dialing in a firmer setup on an M1025 Hummer, the GPM aluminium arm offers straightforward fitment with minimal geometry change.