LOSI Promoto-MX 7075 Alloy Linear-Rate Rear Shock Spring Set by GPM MX112/SP  [MX112/SP]

Rear Shock Spring Set Overview

This spring set is an RC-scale rear shock tune pack produced for LOSI Promoto-MX platforms by GPM, supplied as three linear-rate springs with distinct stiffness options. Each spring targets rear suspension tuning tasks on the listed LOSI 1/4 Promoto-MX and Promoto-SM RTR models, allowing quick rate changes without altering shock bodies or pistons.

The set includes a soft, medium, and firm spring so you can compare ride height and rebound characteristics trackside. Spring geometry from the supplier is provided for reference, including coil counts and internal diameter consistency across the three rates, which helps when matching replacement springs to existing shock shafts and springs retainers.