Serpent 500916 Rear Shock Spring 13mm 2.3lbs  [SER500916]

Rear Coil Spring, 13mm, 2.3lbs Rate

This Serpent 500916 spring is a 13mm-diameter coil designed for rear shock assemblies in general R/C applications. Finished in purple, it provides a nominal 2.3lbs rate and is offered as a replacement for tuning rear suspension stiffness without modifying damper internals.

On setup, the spring controls static ride height and linear stiffness via preload and installed length. When fitting, check spring seats and retainer types on your shock to ensure proper seating and free travel. Because spring rate and damper oil interact to influence rebound and compression, use this spring as one step in a matched tuning process rather than a standalone fix for handling.

Installation tips: compress the shock slightly to check for binding at full droop and full compression, increase preload in small steps, and record handling changes after each adjustment. Keep the purple finish free of grit to prevent seating problems in the retainer.