King SPR425-08-250 Coil Spring 4.25" ID 8" Length 250 lb Rate

The King SPR425-08-250 is a high-performance coil spring designed specifically for off-road suspension applications. This 4.25-inch inside diameter coil spring features an 8-inch free length and a 250 lb/in spring rate, making it ideal for custom coilover shock setups on trucks, UTVs, and off-road race vehicles.

Key Specifications:

• Inside Diameter: 4.25 inches
• Free Length: 8 inches
• Spring Rate: 250 lbs per inch
• Manufactured from high-tensile chrome silicon wire
• Closed and ground ends for flat seating and true deflection
• Spring rate etched into top coil for easy identification

Performance Features:

• Specifically wound for off-road applications, not repackaged automotive springs
• Spring rates and coil lengths developed through extensive real-world testing
• Race-proven designs tested from Baja to Dakar competitions
• Universal fit compatible with King and other brands of coilover shocks
• Made in USA to King's exacting specifications

The 250 lb/in spring rate means this coil requires 250 pounds of force to compress one inch. Understanding spring rate is critical for proper suspension tuning - compressing this spring two inches requires 500 lbs of force, three inches requires 750 lbs, and so on in a linear progression.

What's Included: One coil spring only (shock body and hardware sold separately)

Warranty: King Shocks backs this spring with a lifetime warranty to the original purchaser against sagging and breakage, providing confidence for even the most demanding off-road conditions.