Tein SKM72-AUB00 S.Tech Lowering Spring for Mazda6 Front spring rate: 4.9 kilogram per millimeter (274 pounds per inch) Rear spring rate: 3.6 kilogram per millimeter (162 pounds per inch) Front ride height: -54 millimeter (-2.1 inch) Rear ride height: -41 millimeter (-1.6 inch) Progressive spring rate design