Tein SKK04-AUB00 S.Tech Lowering Spring for Nissan 370Z Front spring rate: 8.5 kilogram per millimeter (476 pounds per inch) Rear spring rate: 9.4 kilogram per millimeter (302 pounds per inch) Front ride height: -22 millimeter (-0.9 inch) Rear ride height: -19 millimeter (-0.7 inch) Progressive spring rate design