Tein SKP92-BUB00 High.Tech Lowering Spring for Infiniti G35 Front spring rate: 5.8 kilogram per millimeter (325 pounds per inch) Rear spring rate: 4.7 kilogram per millimeter (263 pounds per inch) Front ride height: -37 millimeter (-1.5 inch) Rear ride height: -34 millimeter (-1.3 inch) Progressive spring rate design