BC Racing V1 Series Coilovers – 10/3.6 kg/mmBC Racing V1 Series Coilovers 10 3. 6 kg mm The BC Racing V1 Series coilovers with 10 3. 6 kg mm spring rates are engineered as a balanced street performance suspension solution. Designed for drivers who want improved stability, sharper handling and a controlled ride without sacrificing everyday comfort, the V1 Series delivers excellent value and reliability. With pre set damping tuned for road use, these coilovers offer predictable feedback and