Spring Rates:Front: 20.0 Kg/mmRear: 20.0 Kg/mmK-Sport Version RR coilover System is built specifically for road racing only. Aggressive rates and valving are chosen for maximum handling and performance with acute reaction and responsiveness. Integrated with 36 levels of damping adjustment, simultaneous compression and rebound adjustment, lightweight aluminum mounts, and pillow ball upper mounts on some applications. (Race use only.)