Tein SKJ68-AUB00 S.Tech Lowering Spring for Dodge Charger Front spring rate: 4.1 kilogram per millimeter (230 pounds per inch) Rear spring rate: 11.5 kilogram per millimeter (196 pounds per inch) Front ride height: -40 millimeter (-1.6 inch) Rear ride height: -26 millimeter (-1 inch) Progressive spring rate design