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Round Wire Linear Rate Bump Springs 700 lbs/in
140 lbs/in
Sold as a pair
350 lbs/in
This is a soft compound tire made to tackle autocross or track days
Swift Progressive Helper Springs 65mm ID, 4 in length 5.3-11.6kg/mm Pair Bump Springs Round Wire Linear Rate Bump65mm ID, 4 in length 5. 3 11. 6 kg mm Progressive Swift helper Springs are made from a proprietary material. Helper springs allow the spring to stay on mounted on the coilover perch when the shock is under negative or zero load, also known as droop travel. The same springs are used in Super GT, Formula Nippon, F3, F3000, Super Taikyu, IMSA, Pirelli World Challenge, Rally America, VLN, Le Mans Series, Formula Drift, and many other professional racing
