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S-Groove Motorsport face type
Swift Spec-R Springs 09+ NISSAN 370Z Z34 4N905R
7 in length 4 kg/mm
Ikeya Formula
Built for track duty
Swift Helper Springs 70mm ID, 2.8 in length 0.8 kg/mm Pair Spec R Springs S-Groove Motorsport face type70mm ID, 2. 8 in length 0. 8 kg mm 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 avenues.
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