13mm Rear Shock Spring rr Pink 2.1lbs - Serpent 500914  [SER500914]

Tuning the rear spring

The Serpent 500914 rear spring is specified as a 13mm coil with a 2.1lbs rate and a pink finish. Positioned for rear (rr) use, it is employed to modify ride height, initial spring stiffness, and weight transfer behaviour on RC-scale cars.

Compatibility guidance: suitable where a 13mm coil spring is required for rear shock assemblies. Do not presume compatibility with custom retainers or non-standard shock designs without verifying dimensions; confirm inner diameter and seat type on the shocks prior to fitting.

Installation notes: take the shock off the chassis, relieve preload by compressing the shock body, swap the springs while keeping track of orientation and spring seat positioning. Reassemble and set a conservative initial preload so the spring sits correctly without excessive compression at static ride height. Conduct short test runs and fine tune preload in small steps.

Tuning role: fitting a 2.1lbs rear spring increases rear roll stiffness over softer options, which can reduce acceleration squat and change mid-corner balance. Combine spring changes with damper oil viscosity and piston selection to refine damping characteristics rather than relying solely on spring rate.