Spring Rates:Front: 18.0 Kg/mmRear: 12.0 Kg/mmK-Sport Asphalt Rally coilover systems are designed specifically for asphalt rally competition on paved roads. Wishbone type coilovers feature large 44mm pistons which allow for a larger volume of shock oil which helps reduce internal temperatures over long term usage. As with all of our coilovers, simultaneous compression and rebound adjustment is standard.