H&R 60mm ID Single Race Spring Length 120mm Spring Rate 240 N/mm or 1370 lbs/inch 2020-nissan-370z-esi6748583 ARP SB Ford SVO 351

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H&R 60mm ID Single Race Spring Length 120mm Spring Rate 240 N/mm or 1370 lbs/inch 2020-nissan-370z-esi6748583 ARP SB Ford SVO 351H&R 2. 50" I. D. Race Springs are made with extremely high tensile strength wire alloy which allows the use of a thinner wire. Manufactured using advanced materials and precision technology in Germany, H&R 2. 50" I. D. Race Springs are crafted from special lightweight (hf) 54SiCr6 spring steel. For any given spring rate, they are on average 15% lighter and have 10% more travel than competitors' springs. Main springs range from 6" to 18" in length and