Coilover Spring 12in x 2.5in x 450lb

The Coilover Spring 12in x 2.5in x 450lb from Swift Springs is a precision suspension component engineered for drivers seeking refined ride height control and spring rate consistency. Built for custom coilover systems, this spring works as the load-bearing element in aftermarket suspension setups that demand tunable compliance and predictable geometry changes. Whether you're building a street-focused lowered setup, dialing in track day suspension geometry, or creating a drift-ready platform, a quality coilover spring like this one is fundamental to translating your vision into stable, repeatable handling.

This 12-inch progressive coilover spring carries a 450-pound spring rate and features a 2.5-inch outer diameter, making it compatible with most popular coilover damper bodies in the market. The 450lb/in rate sits in the middle-ground for street applications—stiff enough to minimize body roll and maintain predictable anti-squat/anti-dive characteristics during hard acceleration and braking, yet compliant enough for daily driving comfort on imperfect pavement. Swift Springs' manufacturing tolerances ensure consistent spring behavior across compression cycles, critical for maintaining alignment specs and suspension kinematics as you adjust ride height through the coilover's threaded body.

Mechanics and suspension enthusiasts typically pair this spring with adjustable dampers to create a complete lowering system for import and domestic platforms alike. The 12-inch compressed length works with standard coilover shock bodies to deliver 2–4 inches of ride height reduction depending on vehicle weight and spring seating. Installation requires proper spring compression tools and alignment checking post-installation; once fitted, you'll gain independent control over damping stiffness and ride height, enabling fine-tuned suspension tuning that factory systems cannot match.