Coilover Spring 12in x 2.5in x 500lb

The SWIFT SPRINGS Coilover Spring 12in x 2.5in x 500lb is a precision-engineered suspension component designed for serious automotive enthusiasts and professional builders who demand precise ride height and load-bearing control. This barrel-style coil-over spring serves as the foundation for custom suspension setups, offering the stiffness and consistency required in street, track, and competition applications where factory suspension geometry no longer meets performance expectations. Whether you're building a lowered street car, a road course competitor, or fine-tuning a drag platform, this spring delivers the repeatability and durability that separates engineered builds from guesswork.

With a 500 lb/in spring rate, this SWIFT coil-over provides aggressive support while maintaining the linearity needed for predictable body control under load transfer. The 12-inch length and 2.5-inch inner diameter (ID) fit standard coil-over shock bodies, integrating seamlessly into tuned suspension packages. Black powder-coat steel construction resists corrosion and dissipates heat effectively, critical factors in high-cycle applications where thermal expansion and vibration fatigue can degrade lesser materials. The barrel design maximizes load distribution, reducing binding and ensuring consistent spring rate across the compression range—essential for platforms requiring precise suspension tuning or multi-setup versatility.

This spring excels in custom suspension builds where OEM springs lack the stiffness or adjustability required for lowered ride heights or performance-oriented geometry changes. Mechanics and builders typically pair 500 lb springs with compatible coil-over shock kits to achieve front or rear corner-specific tuning; the high spring rate suits mid-weight to heavier vehicles or aggressive lowering applications. Installation requires compatible coil-over hardware and proper suspension knowledge—alignment and spring seating verification are critical post-install. Verify compatibility with your shock body specifications (2.5" ID) and vehicle weight distribution before purchase to ensure the 500 lb/in rate matches your suspension geometry and driving demands.