Unlock the full potential of your suspension with swift springs 4×2.5 inch (65mm) — high-performance coilover springs engineered for precision, responsiveness, and consistency. Designed for racers, tuners, and enthusiasts who expect the best, Swift Springs are known worldwide for their unmatched craftsmanship, linear rate design, and lightweight construction.

The swift springs 4×2.5 inch (65mm) model is compatible with coilover systems using a 2.5-inch inner diameter spring seat, making them ideal for a wide range of aftermarket applications. Available in a complete lineup of spring rates — 18K, 20K, 22K, 24K, 26K, 28K, 30K, 32K, 34K, 38K, 42K, 46K, and 50K — these springs allow you to fine-tune your suspension for street comfort, track grip, or competition-level handling. Each spring rate is carefully calibrated to deliver consistent load characteristics and responsive performance under pressure.

Swift Springs are sold in pairs of two and are not available as single units. This ensures that each set maintains perfect rate matching and balanced performance when installed on your vehicle. Every pair is precisely tested and weight-matched before packaging, guaranteeing symmetrical compression and ride quality across both sides of your car.

Constructed from Swift’s proprietary H5S.TW spring steel, these springs deliver exceptional tensile strength with less mass than conventional coilover springs. The result is improved suspension response, reduced unsprung weight, and better shock control. Swift’s unique steel formulation allows their springs to maintain their rate accuracy over time, minimizing sag and fatigue even under intense driving conditions.

The 4-inch length and 65mm (2.5-inch ID) design make these springs a perfect fit for compact coilover setups or vehicles with limited shock travel. Swift’s true linear rate design ensures a predictable compression curve — giving the driver consistent feedback through corners, better traction, and smoother transitions under braking and acceleration.

Each spring undergoes strict load testing and quality control to meet Swift’s high manufacturing standards. The corrosion-resistant finish preserves both the look and function of the spring, making it suitable for long-term street and motorsport use. Whether you’re building a time attack car, a drift setup, or a refined street build, Swift Springs deliver precise handling and long-lasting reliability.

Key Features:

Swift Springs 4×2.5 Inch (65mm) coilover spring

Available in 18K–50K spring rates

Sold in pairs of two (no single options)

Compatible with 2.5-inch ID coilover systems

Linear rate design for consistent handling and feedback

Lightweight construction for improved suspension response

Reduces unsprung mass and maintains rate accuracy

Corrosion-resistant finish for long-term durability

Made in Japan with precision quality control

Function, balance, and strength define the swift springs 4×2.5 inch. For those serious about performance and reliability, these are the springs trusted by top builders and racers around the world.

History about Swift Springs

Spring Options