Coil Spring - 2.5in x 7 300#

The Coil Spring - 2.5in x 7 300# from QA1 is a high-travel coil-over spring engineered for performance suspension builds, drag racing, road course tuning, and serious off-road applications. This spring is designed for builders and enthusiasts who demand precise suspension geometry control and consistent spring rates across compression cycles. Whether you're dialing in a weekend warrior or a competition vehicle, this 300 lb/in spring rate delivers the stiffness needed for controlled body roll and consistent ride height under dynamic loads.

Built from high-grade steel with a silver powder coat finish, the Coil Spring - 2.5in x 7 300# combines durability with corrosion resistance in harsh track and environmental conditions. The 2.5-inch inner diameter (ID) specification ensures compatibility with standard coil-over shock bodies, while the 7-inch free length accommodates mid-range suspension travel without binding or excessive preload. The 300 lb/in spring rate strikes a critical balance—stiff enough to minimize chassis squat and dive during acceleration and braking, yet compliant enough to maintain tire contact on uneven surfaces. Each spring weighs 2.05 lbs, keeping unsprung mass minimal and improving overall vehicle responsiveness.

This QA1 spring is ideal for enthusiasts building independent double-A-arm, MacPherson strut, or multi-link suspension systems where precise spring rate selection is non-negotiable. Road racers benefit from the consistent load curve that maintains consistent anti-roll characteristics lap after lap, while drag racers appreciate the stability it provides during hard launches. Installation pairs seamlessly with quality coil-over shock absorbers in 2.5-inch diameter configurations; ensure your shock body matches this ID before ordering. Always verify spring rate compatibility with your vehicle's weight, desired suspension geometry, and driving discipline—spring selection directly impacts handling balance, tire wear, and lap times.