The Serpent SER402186 Topdeck soft is an RC-scale pair of topdecks provided as 2 pcs for tuning chassis flex on the Medius X26 steel EP (SER400052). Compared to stiffer decks, the soft version lowers overall rigidity and changes mid-corner traction and weight transfer in a controlled manner.
Fitting is simple using the Medius X26 steel EP stock mounts and existing hardware; it replaces the factory topdeck while keeping the same mounting points. When installing, make sure the deck is seated flat and that mounting screws are torqued evenly to prevent twisting; afterwards, check alignment and run short trials to confirm behaviour.
Tuning advice: position the soft deck to alter front or rear response as required, and pair changes with spring and anti-roll bar adjustments to reach a balanced feel. Record lap data or driver notes to judge the effect before making further changes.
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