H&R HRF125-36-060 36mm ID Race Spring 125 lb/in 60mm Length

The H&R HRF125-36-060 is a high-performance linear-rate coilover race spring engineered for motorsport and performance street applications. Featuring a 36mm inner diameter, a 60mm free length, and a 125 lb/in (21.78 N/mm) spring rate, this spring is designed to deliver consistent, predictable suspension behavior under demanding track conditions.

H&R race springs are cold-wound from high-tensile chrome-silicon steel and precisely heat-treated for long-term fatigue resistance and rate consistency. The tight tolerances in both rate and length ensure matched sets perform identically side to side, critical for balanced chassis tuning.

Key Features:

• Inner Diameter: 36mm — compatible with most 36mm-spec coilover sleeves and perches
• Free Length: 60mm
• Spring Rate: 125 lb/in (approximately 21.78 N/mm) — linear, progressive-free design for predictable response
• Cold-wound from high-tensile chrome-silicon steel for superior fatigue life
• Precision heat-treated for consistent rate across the full compression range
• Tight manufacturing tolerances on rate and length for matched-set pairing
• Suitable for coilover conversion kits, dedicated race builds, and performance tuning applications

H&R is a globally recognized German suspension manufacturer with decades of motorsport heritage. The HRF-series race springs are a staple in time attack, circuit racing, and performance road car builds where precise spring selection is essential to achieving optimal lap times and ride balance.