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This is a dual progression rear spring, specialized for road surfaces with comparatively low grip such as P tiles and painted concrete!
We did a lot of research selecting the material, steel quenching temperature and quenching time with many results to compare.Giving us a lineup of three types of rear spring (Medium, Medium Hard, Hard) that can be selected according to the vehicle weight and road surface
grip.With the 2-way structure, the springs can be flipped up and down to instantly adjust to the circuit track conditions.
Main specifications of Medium spring
Length (natural length): 32mm
Number of turns: 9.5
Shrink tube color ID: Black