Tamiya M1025 Hummer Aluminium Lower Arm HM1055 Performance Upgrade by GPM  [HM1055]

Overview of the front lower arm

This aluminium front lower suspension arm is offered as an aftermarket replacement for the Tamiya M1025 Hummer, produced by GPM and supplied as 1 pr. It is intended to swap directly into compatible M1025 chassis locations and does not require altering mounting points.

As a tuning component, the arm changes suspension response and steering feedback rather than adding new mechanical functions. Installation normally involves removing the wheel hub and the existing lower arm fasteners, then reusing or replacing hardware depending on condition.

Use this part to reduce lower arm flex and to stabilise the suspension pivot under load during scale off-road driving. Because the material stiffness increases, expect different handling characteristics and tune shocks accordingly.

For hobbyists replacing a fatigued arm or setting a firmer baseline for tuning on an M1025 Hummer, this GPM aluminium arm offers simple installation and predictable fitment.