Serpent 500909 13mm Front Shock Spring 3.8lbs Purple  [SER500909]

Serpent 500909 front spring 13mm overview

This Serpent 500909 front shock spring is a purpose-made 13mm unit with a 3.8lbs nominal rate, finished in purple for a coordinated look. It serves as an RC replacement spring for front shock assemblies that accept 13mm springs and standard spring seats.

Compatibility: confirm your front shock accepts a 13mm-length spring and has a standard inner-diameter spring seat before fitting. The spring changes front suspension stiffness and works best when paired with matched shock oil weight and preload settings.

Installation overview: take off the shock cap and shaft assembly, slide the original spring away from the shock body, position the Serpent 13mm spring onto the seat, set the desired preload with the collar, then reassemble the shock. After reassembly check free shaft travel and correct damper action.

Tuning role: choosing a 3.8lbs front spring increases spring force versus softer springs, cutting down body roll and front dive under braking while making the front feel firmer. Make incremental adjustments and retest, altering shock oil and rebound to rebalance handling rather than relying solely on a spring swap.