H&R RF085-36-040 ID Race Spring lbs/in Free Length - 36mm 229 3.35in

The H&R RF085-36-040 is a single 36mm inner diameter race spring engineered for serious motorsport and high-performance coilover applications. Built from special lightweight 54SiCr6 spring steel, this spring delivers consistent, predictable performance under the most demanding track conditions.

With a 3.35-inch free length and a 229 lbs/inch spring rate, the RF085-36-040 offers a firm, responsive tune ideal for circuit racing and competitive motorsport setups. The spring is factory pre-blocked, meaning it will never set or sag over time — a critical requirement for race-grade suspension components.

Key Specifications:

• Inner Diameter (ID): 36mm
• Free Length: 3.35 inches (85mm)
• Spring Rate: 229 lbs/inch (40 N/mm)
• Block Height: 1.34 inches
• Load at Block: 459 lbs
• Weight: 0.35 lbs
• Material: 54SiCr6 lightweight high-performance spring steel

Key Features:

• Factory pre-blocked — will never set or sag
• Trapezoidal (flat) wire construction for low block height and maximum travel
• Part of H&R's comprehensive 36mm ID lineup spanning 2.76" to 5.12" lengths and 72 to 686 lbs/inch rates for precise tuning flexibility
• Designed for demanding motorsport environments
• Sold individually (per spring)

The H&R RF085-36-040 is an excellent choice for builders and tuners seeking a proven, race-proven coilover spring with a well-documented rate and reliable construction. Mix and match with other H&R 36mm ID springs to dial in the perfect suspension setup for your application.