Tein SKB90-AUB00 S.Tech Lowering Spring for Acura TSX Front spring rate: 7.8 kilogram per millimeter (437 pounds per inch) Rear spring rate: 4.1 kilogram per millimeter (157 pounds per inch) Front ride height: -40 millimeter (-1.6 inch) Rear ride height: -35 millimeter (-1.4 inch) Progressive spring rate design