HPI Bullet 3.0 MT/ST Alloy Adjustable Front/Rear Spring Damper by GPM BMT3100F/R  [BMT3100F/R]

Adjustable front/rear dampers for Bullet 3.0

This GPM BMT3100F/R is an RC-scale alloy front and rear adjustable spring damper set designed for HPI Bullet 3.0 MT and ST nitro chassis. The kit is supplied as 1pr set and uses a 3.5mm thick steel shaft paired with an aluminium alloy body to improve durability over common plastic housings while keeping weight suitable for model-scale suspension.

Functionally the dampers provide adjustable spring support for tuning ride height and spring preload on both front and rear corners. The hardware is intended to match the mounting points and stroke length used on the Bullet 3.0 MT and ST nitro variants, allowing direct replacement of original dampers without modifying the chassis mounting locations.

When tuning, consider spring rate and preload combinations before changing damping medium or pistons; the alloy body and steel shaft focus on strength and shaft straightness, while spring and oil choices remain the primary method to alter compression and rebound behaviour. Use common RC tools for removal and installation, check thread engagement and pivot points, and verify smooth shaft travel before running.

This GPM damper set is suited for hobbyists seeking a metal-bodied, shaft-thickened replacement for HPI Bullet 3.0 MT/ST nitro models where improved durability and consistent shaft straightness are priorities during suspension setup.