Coilover Spring 12in x 2.5in x 375lb

The Coilover Spring 12in x 2.5in x 375lb by SWIFT SPRINGS is a premium performance suspension component engineered for vehicles requiring precise vertical load control and damping response. Built for enthusiasts and mechanics who demand repeatability in handling characteristics, this coilover spring serves as the elastic foundation of a complete coilover suspension system. Whether you're fine-tuning street performance, preparing a track day vehicle, or dialing in a build with adjustable dampers, this spring provides the consistent spring rate needed to maintain consistent ride height and cornering geometry across driving conditions.

At 375 pounds per inch (lbs/in), this spring rate strikes a balance between compliance and stiffness suitable for most street-focused suspension setups and entry-level motorsport applications. The 12-inch free length with a 2.5-inch inner diameter accommodates standard coilover shock bodies and allows for broad ride height adjustment without coil binding or excessive preload. SWIFT SPRINGS designs this component from high-carbon alloy steel, heat-treated to maintain consistent load characteristics through thousands of compression cycles. The linear spring rate means predictable suspension behavior—essential when paired with quality dampers for achieving optimal weight transfer and tire contact during acceleration, braking, and cornering.

This coilover spring benefits drivers building or upgrading independent double-wishbone or MacPherson strut suspension systems, particularly on Japanese and European sports cars where aftermarket support is extensive. Mechanics and fabricators value SWIFT SPRINGS' dimensional consistency—the 4.8-inch outer diameter and precise 15.65-inch packaging height allow straightforward fitment alongside quality monotube or twin-tube coilover shocks. For optimal results, verify your vehicle's coilover platform accepts standard 2.5-inch ID springs and confirm total system ride height targets before installation. Pair this spring with properly valved dampers matched to the 375 lbs/in rate for predictable suspension geometry and performance.