H&R RF070-36-030 ID Race Spring lbs/in Free Length - 36mm 172 2.83in

The H&R RF070-36-030 is a 36mm Inner Diameter Race Spring engineered for precision suspension tuning in competitive motorsport applications. With a 172 lbs/inch spring rate and a 2.83-inch free length, this spring sits at the softer end of H&R's 36mm lineup, making it well-suited for fine-tuned setups requiring progressive compliance and controlled wheel movement.

Key Specifications:

• Part Number: RF070-36-030
• Inner Diameter (I.D.): 36mm
• Free Length: 2.83 inches
• Spring Rate: 172 lbs/inch (approximately 30 N/mm)
• Block Height: 1.14 inches
• Load at Block: 290 lbs
• Weight: 0.24 lbs per spring

Key Features:

• Crafted from special lightweight 54SiCr6 silicon-chrome spring steel for superior strength-to-weight ratio
• Pre-blocked at the factory — springs will never set or sag under race conditions
• Engineered for demanding motorsport environments with consistent, repeatable performance
• Available in a wide range of lengths and spring rates for precise suspension tuning
• Compatible with aftermarket coilover systems designed for 36mm I.D. springs

H&R Race Springs are sold individually, allowing builders to mix and match rates across axles for asymmetric or diagonally split setups. Whether used as a primary spring on a purpose-built race car or as part of a stacked spring configuration, the RF070-36-030 delivers the predictable, fade-free performance that H&R is known for in professional motorsport.