This Serpent 500905 spring is an RC-scale front shock component, supplied as a 13mm-diameter option with a 3.3lbs spring rate in orange. It’s intended to change front-end stiffness as part of suspension setup, giving a straightforward mechanical option for riders adjusting balance and handling on track or bashing sessions.
Compatibility is generic to front shock assemblies that accept a 13mm coil spring profile, so verify fit against your shock’s spring perch, shaft, and travel before installation. This item is a replacement/upgrading spring for RC shock absorbers and not a complete shock unit.
Installation is simple: remove the shock from the car, disassemble the shock cap or retainer, swap the spring, then reassemble while checking preload and free length as needed for your setup. After reassembly, confirm smooth shaft travel and that the spring seats correctly on the perch during full compression and rebound cycles.
Tuning notes: a 3.3lbs spring rate increases front stiffness relative to softer springs, affecting dive under braking, roll response, and turn-in feel. Use this spring when you want firmer front response; combine it with appropriate damping settings and ride-height adjustments for balanced handling.
