RC tuners looking for dependable spring rates will find the Serpent SER401764 Red Shock Springs useful for the 4X EVO. The fixed C=6.3 rate helps preserve consistent rebound and compression under load.
These springs enhance on-centre feel and steady the chassis during quick direction changes. They suit track layouts where consistent feedback matters and are straightforward to integrate with stock 4X EVO shock assemblies.
Before fitting, clean shock internals and inspect seals. Seat the spring evenly and cycle the shock to confirm smooth travel. Regularly verify spring free length and swap them out if performance drifts after hard use.
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