Serpent 500916 13mm RR Spring 2.3lbs  [SER500916]

13mm Rear Shock Coil — 2.3lbs

The Serpent 500916 is a 13mm outer-diameter coil spring coloured purple and rated at 2.3lbs, made to serve as a rear shock replacement part for standard R/C dampers. It allows drivers to alter rear spring stiffness without opening the damper body.

Functionally, the spring sets static ride height and contributes to linear spring stiffness through preload and installed length choices. When fitting, inspect the spring seats and retainer configuration so the spring sits correctly and has full travel. Remember that spring rate works together with damper oil and piston settings to control rebound and compression.

Fitment advice: compress the assembled shock through its travel to confirm there is no binding, adjust preload in small increments, and test on-track between changes. Keep the finish clean to avoid grit catching under the retainer.