C/O Spring - 2.5in ID x 14in Black

The C/O Spring - 2.5in ID x 14in Black from QA1 is a precision coil-over spring engineered for serious suspension builds and performance vehicle modifications. Whether you're upgrading a track car, street rod, or competition platform, this spring is built to deliver consistent load support and predictable ride dynamics in demanding applications. Coil-over springs are the foundation of modern suspension tuning, allowing builders to dial in ride height, spring rate, and handling characteristics independently from shock damping—a critical advantage for anyone pursuing aggressive vehicle performance.

This QA1 coil-over spring features a 2.5-inch inner diameter and 14-inch free length, making it compatible with most modern coil-over shock systems and aftermarket suspension packages. The black powder-coated finish protects against corrosion while maintaining a clean appearance in engine bays or visible suspension installations. QA1 springs are manufactured to tight tolerances with high-quality spring steel, ensuring consistent rate characteristics across compression cycles—essential for predictable handling on both road and track. The 14-inch length positions this spring for mid-to-heavy duty applications, commonly paired with adjustable shock absorbers in performance suspension setups where vertical space and load capacity demand precision engineering.

Mechanics and suspension specialists choose QA1 springs for custom builds where repeatability and longevity matter. This spring works best in complete coil-over kits where matching shock valving and spring rate to vehicle weight and intended use—street cruising, autocross, road racing, or drag applications—maximizes performance. Installation requires basic spring compressor tools and knowledge of suspension geometry; verify fitment with your specific coil-over shock body and ensure proper preload and ride height adjustment during setup. The 6.89-pound weight reflects premium materials engineered to handle multiple heat cycles without fatigue, making it a reliable choice for builds that demand durability and consistent performance.