Serpent 500912 13mm rear shock spring, orange, 1.9lbs  [SER500912]

Rear shock spring for tuning

This Serpent 500912 shock spring is an RC-scale rear shock spring supplied in orange with a 13mm wire designation and a 1.9lbs spring rate as stated in the product title. It is intended as a direct spring option for rear shock assemblies, used to alter support and rebound characteristics without changing shock bodies or mounts.

Fit and installation are straightforward for common threaded-piston or cup-style rear shock assemblies: remove the shock end caps, slide off the existing spring and lower spring retainer, replace with the Serpent 500912 spring, then reset preload and rebound settings as required. No additional tools beyond standard RC maintenance tools are required.

In tuning terms this spring is used to increase rear support and slightly quicken rebound response compared with softer rates, helping balance understeer/oversteer tendencies when adjusted in concert with shock oil viscosity and preload. Always test incrementally and record settings to compare on-track behavior.