The Serpent 500905 spring is a 13mm-diameter front shock coil in orange with a 3.3lbs rate. It provides a simple way to alter front-end stiffness as part of suspension setup, helping drivers tune balance and handling for track sessions or casual bashing.
Compatibility is generic to front shock assemblies that accept a 13mm coil spring profile, so confirm fit with your shockâs spring perch, shaft, and travel before installing. This item is a replacement or upgrade spring for RC shock absorbers and is not a full shock unit.
Installation is straightforward: remove the shock from the car, disassemble the shock cap or retainer, swap the spring, then reassemble while checking preload and free length for your setup. After reassembly, verify smooth shaft travel and that the spring seats correctly on the perch during full compression and rebound.
Tuning notes: a 3.3lbs spring rate moves the front toward a firmer feel compared with softer springs, which will alter dive under braking, roll response, and initial turn-in. Pair this spring with appropriate damping and ride-height adjustments to maintain balanced handling.
