BMax4 Rear Shock Spring Orange Soft - Yokomo YOKBMS12100  [YOKBMS12100]

BMax4 Rear Spring Overview

This RC-scale rear suspension spring is specified for BMax4 rear shock assemblies. The orange soft coil delivers a reduced spring rate suited to setups that demand greater rear compliance, for example low-traction surfaces or fine-tuning weight transfer on 1/10 electric touring cars.

Compatibility and fitment focus on BMax4 rear shock housings and the standard spring retainers used on that platform. Installation follows standard shock service steps: remove the shock from the chassis, compress and remove the spring cap, swap the spring, then reinstall and confirm preload and ride height. Use common RC tools such as hex drivers and shock pliers to handle the spring safely.

Tuning notes: a softer rear spring reduces sprung stiffness at the rear axle and can increase mechanical grip, while also potentially increasing body roll and squat under acceleration. Balance spring choice with shock oil viscosity and piston selection, make incremental adjustments, and test on-track to assess handling changes.