Tamiya M1025 Hummer Front Lower Suspension Arm HM1055 CNC Aluminium Upgrade by GPM  [HM1055]

Technical overview of the front lower arm

This aluminium front lower suspension arm is a CNC style aftermarket replacement for the Tamiya M1025 Hummer platform, supplied as 1 pr. Manufactured by GPM, the part replaces the stock plastic lower arm and is dimensioned to fit existing M1025 chassis mounting points without modification.

Engineered as a tuning component, the arm increases lateral stiffness and provides a firmer pivot under load to deliver more consistent suspension geometry. Installation requires removal of the wheel hub and the original lower arm fasteners, with reuse of hardware where serviceable or replacement fasteners if necessary.

For precision setup work the aluminium arm gives reduced compliance at the lower link, making suspension behaviour more predictable for shock tuning and roll centre adjustments. Be aware that the change in material stiffness will alter steering feedback and may require complementary setup changes to maintain desired handling balance.

Used for replacing worn components or establishing a stiffer baseline for competitive setup, the GPM aluminium arm offers predictable fitment and enhanced durability while minimising changes to original chassis geometry.