Tein SKM66-AUB00 S.Tech Lowering Spring for Mazda3 Front spring rate: 3.8 kilogram/millimeter (212 pound/inch) Rear spring rate: 2.5 kilogram/millimeter (162 pound/inch) Front ride height (may vary with vehicles that share the same fitment): -45 millimeter (-1.8 inch) Rear ride height (may vary with various vehicles that share the same fitment): -37 millimeter (-1.5 inch) Progressive spring rate design