C/O Spring UHT 2.5in ID 16in Tall Dual Rate

The HYPERCO C/O Spring UHT 2.5in ID 16in Tall Dual Rate coil-over spring is engineered for serious suspension tuning on high-performance and modified vehicles. Built by Hyperco—a name synonymous with precision spring manufacturing—this dual-rate design allows you to dial in both initial ride quality and load-bearing stiffness independently, delivering the responsive handling characteristics that track enthusiasts and aggressive street builders demand. Whether you're upgrading a dedicated track car or fine-tuning a street performance build, this coil-over spring provides the foundation for predictable suspension geometry and precise damping control.

This 16-inch tall spring features a 2.5-inch inner diameter and a dual spring rate spanning 138–375 lb/in, meaning it combines a softer initial rate for bump compliance with a significantly stiffer progressive rate under load. The UHT (Ultra-High Temperature) barrel design uses high-quality steel with blue powder coat protection, resisting corrosion and fatigue over thousands of compression cycles. The dual-rate architecture—achieved through nesting or variable coil geometry—eliminates the need for separate helper springs, reducing unsprung mass and improving response time compared to single-rate alternatives. At 9.79 lbs per spring, the weight penalty is minimal, making it ideal for builds where suspension geometry and ride height adjustability are critical.

This coil-over spring suits any platform running a coil-over suspension system with a 2.5-inch bore, including custom-built chassis, tube-frame race cars, and modern performance vehicles with aftermarket coil-over kits. Installation pairs seamlessly with quality shocks and dampeners; proper valving and spring rate matching will unlock the full benefit of the dual-rate design. Mechanics and builders should verify spring seating, confirm upper and lower perch engagement, and ensure the damper stroke accommodates the 16-inch free length without bottoming or binding. Hyperco springs are manufactured to tight tolerances, ensuring consistent performance across multiple units on multi-corner builds.