Swift Springs 9" x 70mm ID 10.0 kg/mm Coilover Spring

The Swift Springs metric coilover spring, part number Z70-228-100, offers a 9-inch length and a 70mm inner diameter, designed to provide enhanced traction, seamless weight transfer, improved ride quality, and more predictable handling for both daily drivers and race cars. Constructed from Swift's proprietary HS5.TW material, this spring is engineered to be superior to typical silicone chrome steel. This advanced material allows for precise winding and contributes to the spring's performance benefits, such as lower tire temperatures and a more connected feel to the road. With a spring rate of 10.0 kgf/mm (equivalent to 560 lbs/inch), this spring offers a balanced performance characteristic. It features a usable stroke of 113mm (4.4 inches) and a maximum stroke of 140mm (5.5 inches), ensuring ample travel for various driving conditions. These metric coilover springs are sold exclusively in pairs. The springs are color-coordinated based on their inner diameter, though the specific length and rate may not be visually represented by the product image.