King SPR3-18-750 3.0 Inch ID Coil Spring 18 Inch 750lb Rate Off-Road

The King SPR3-18-750 is a high-performance coil spring engineered specifically for demanding off-road applications. This 3.0 inch inside diameter coil spring measures 18 inches in free length and features a 750 lb per inch spring rate, making it ideal for heavy-duty suspension setups on trucks, rock crawlers, and off-road race vehicles.

Premium Construction and Manufacturing:

• Manufactured in the USA using high tensile chrome silicon wire for maximum strength and durability
• Closed and ground ends that sit flat and deflect true for consistent performance
• Spring rate specifications etched into the top for easy identification even after hard use
• Powder coated finish provides excellent corrosion resistance in harsh environments

Off-Road Engineered Performance:

• Specifically wound for off-road use—not repackaged automotive springs
• Spring rates, wire diameters, and coil lengths developed through extensive real-world testing on all terrain types
• Race-proven designs tested from Baja to Dakar competitions
• Linear rate design provides predictable compression characteristics

Universal Compatibility:

• Fits King coilover shocks and all other brands with compatible 3.0 inch ID specifications
• Compatible with 2.5 inch outside diameter coilover shocks
• Sold individually

Understanding Spring Rate: The 750 lb rating indicates the force required to compress the spring one inch. At one inch of compression, the spring generates 750 lbs of force; at two inches, 1,500 lbs; at three inches, 2,250 lbs, and so on in a linear progression.

King Shocks backs this coil spring with a lifetime warranty against sagging and breakage to the original purchaser, demonstrating their confidence in the quality and durability of their manufacturing process.