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The H&R 60mm I.D. race spring is a single 120mm main spring rated 200 N/mm (≈1142 lbs/in) for high‑load tuning. Produced in Germany from (hf) 54SiCr6 lightweight spring steel, the 2.50" I.D. springs use thinner high‑tensile wire to yield about 15% less weight and near 10% more travel than many alternatives. H&R’s 60mm line includes extensive lengths and spring rates plus tender spring options; all main springs are factory pre‑blocked to avoid permanent set.
H&R 60mm ID Single Race Spring Length 120mm Spring Rate 200 N/mm or 1142 lbs/inch
