The Serpent SER402186 Topdeck soft is supplied as two pieces and is intended to adjust chassis compliance on the Medius X26 steel EP (SER400052). By reducing topdeck stiffness versus harder options, it changes mid-corner grip and the character of weight transfer in measurable steps.
Fitting uses the Medius X26 steel EP factory mounts and existing hardware for a direct replacement of the stock topdeck. Ensure the deck sits flat, fasten screws evenly to prevent twist, then confirm wheel alignment and perform brief test runs to assess set-up changes.
Tuning guidance: place the soft topdeck where you need extra compliance to influence front or rear behaviour, and pair the change with spring and swaybar adjustments for a coherent setup. Use lap data and feel to decide if further tweaks are necessary.
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