Serpent SER500917 13mm rear shock spring green 2.4lbs  [SER500917]

Rear shock tuning spring

The Serpent SER500917 is a purpose-made RC-scale rear shock spring specified in the product code, provided in green with a 13mm nominal diameter and a 2.4lbs spring rate as labeled. It is intended as a direct-replacement element for rear shock assemblies where that diameter and rate are required, and should be treated as a component used to adjust suspension stiffness rather than a complete shock unit.

Installation is straightforward for anyone familiar with coil-over shock assemblies: remove the shock cap, slide off the spring retainer, swap the spring onto the shock shaft, then reassemble while checking preload and travel. Verify clearance at full compression and extension after fitting, and recheck fasteners following a short test run.

As a tuning item the spring changes rear-end feel by altering static ride height and how quickly the suspension resists compression, so pair it with correct preload, damper settings, and tyre choice for balanced handling. Use incremental changes and test under representative track conditions to observe effects on traction and corner exit.