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

Front lower suspension arm overview

This aluminium front lower suspension arm is offered as an aftermarket replacement produced for the Tamiya M1025 Hummer platform by GPM, sold as 1 pr. It is an RC-scale component intended to replace the stock plastic lower arm on compatible M1025 chassis parts to change suspension stiffness and durability without modifying the chassis mounting points.

Designed to serve a tuning role rather than provide additional features, the part is best understood as a direct swap that affects suspension response and steering feedback. Installation typically requires removal of the wheel hub and lower arm fasteners and re-use of existing hardware where compatible, or replacement hardware if the original fasteners are not reusable.

Use this part when you want a firmer lower arm to reduce flex under load and to provide a consistent pivot point for suspension geometry during trail or circuit-style scale off-road running. As with any metal hop-up, expect changes to handling that should be balanced with shock tuning and roll center adjustments.

If you are replacing a worn lower arm or testing a stiffer baseline for suspension tuning on an M1025 Hummer model, this GPM aluminium arm provides a straightforward upgrade path while keeping installation and geometry changes minimal.