Nitron Racing factory spring sets. These are specifically for the Alfa Romeo 4C R1 and R3 coilover kits.

Springs are sold in pairs, choose front 2.25” I.D. springs and rear 60mm I.D. springs at the rates listed. Rates listed are in Newton/MM.

For reference, the baseline Nitron 4C fast road rates are 50 n front and 70 n rear. And 4C trackday/race rates are 65 n front and 80 n rear.

Variation in track surface and layout, high grip tires, and added aerodynamic elements often require different spring rates.