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

Serpent 500909 13mm Front Shock Spring

This Serpent 500909 front shock spring is a dedicated 13mm spring with a 3.8lbs nominal rate, supplied in purple to match visual setups. It is an RC-scale replacement part intended for front shock assemblies that accept 13mm springs and standard spring seats.

Compatibility: check that your front shock uses a 13mm-length spring and standard inner diameter seating before installation. The spring is intended to change front suspension stiffness and should be used as part of a matched setup alongside appropriate shock oil weight and preload adjustments.

Installation overview: remove the shock cap and shaft assembly, slide the old spring off the shock body, fit the Serpent 13mm spring onto the spring seat, set preload using the collar as required, then reassemble the shock. Verify free shaft movement and correct damper action after reassembly.

Tuning role: moving to a 3.8lbs front spring increases spring force compared with softer springs, reducing body roll and front dive under braking while making the front end feel firmer. Use incremental changes and retest—adjust shock oil and rebound to rebalance handling rather than relying on spring change alone.