Serpent 500916 Shock spring 13mm RR 2.3lbs  [SER500916]

Rear shock spring, 13mm 2.3lbs

This Serpent 500916 spring is a 13mm-diameter coil intended for rear shock assemblies in general R/C use. Finished in purple, the spring is defined by its 2.3lbs rate and is sold as a direct replacement part for users looking to adjust rear suspension stiffness without changing damper internals.

In setup terms, the spring governs static ride height and linear stiffness through preload and installed length. When fitting this spring, verify the spring seats and retainer types on your shock to ensure correct seating and free travel. Because spring rate and damper oil work together to control rebound and compression, use this spring as part of a matched tuning step rather than as a standalone fix for handling issues.

Practical installation tips: compress the shock slightly to check for binding at full droop and full compression, set initial preload in small increments, and log handling changes after each adjustment. Keep the purple finish clean and free of debris to avoid seating issues in the spring retainer.