Coilover Spring 10in x 2.5in x 450lb

The SWIFT SPRINGS Coilover Spring 10in x 2.5in x 450lb is a precision-engineered coil-over suspension component designed for street and track enthusiasts who demand responsive handling and vehicle-specific ride height control. This barrel-shaped spring sits at the heart of modern coilover suspension systems, working in tandem with dampers to deliver predictable weight transfer, reduced body roll, and improved tire contact patch during aggressive driving. Whether you're building a performance street car, preparing for weekend track days, or fine-tuning an autocross competitor, this spring rate provides the stiffness needed for controlled suspension articulation without sacrificing ride comfort on moderate imperfections.

Manufactured from high-grade steel and finished with black powder coating to resist corrosion and UV degradation, the 450 lb/in spring rate is engineered to match medium-weight vehicles and moderate power levels—typical of street-legal turbocharged, supercharged, or naturally aspirated builds in the 2,800–3,500 lb range. The 10-inch free length and 2.5-inch inner diameter allow seamless integration into most modern coilover bodies, while the barrel profile optimizes the load curve to maintain consistent spring rate throughout compression and extension cycles. This geometry reduces coil binding risk and improves damper response, critical for corner speed and mid-corner stability during sustained cornering.

Mechanics and tuners commonly pair this spring with adjustable coilover housings to dial in front or rear suspension geometry on platforms ranging from compact sports cars to mid-size sedans and coupes. The 450 lb/in rate works best when matched to properly valved dampers—under-damped setups will cause excessive oscillation, while over-damped configurations reduce suspension compliance. Before installation, verify that your coilover body accepts 2.5-inch ID springs and confirm vehicle weight distribution and target ride height to ensure this rate aligns with your suspension geometry goals and intended driving purpose.