{"product_id":"swift-springs-4x2-5-inch-65mm","title":"Swift Springs 4×2.5 Inch","description":"\u003cp\u003eUnlock 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.\u003c\/p\u003e \u003cp\u003eThe 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.\u003c\/p\u003e \u003cp\u003eSwift 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.\u003c\/p\u003e \u003cp\u003eConstructed 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.\u003c\/p\u003e \u003cp\u003eThe 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.\u003c\/p\u003e \u003cp\u003eEach 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.\u003c\/p\u003e \u003cp\u003eKey Features:\u003c\/p\u003e \u003cp\u003eSwift Springs 4×2.5 Inch (65mm) coilover spring\u003c\/p\u003e \u003cp\u003eAvailable in 18K–50K spring rates\u003c\/p\u003e \u003cp\u003eSold in pairs of two (no single options)\u003c\/p\u003e \u003cp\u003eCompatible with 2.5-inch ID coilover systems\u003c\/p\u003e \u003cp\u003eLinear rate design for consistent handling and feedback\u003c\/p\u003e \u003cp\u003eLightweight construction for improved suspension response\u003c\/p\u003e \u003cp\u003eReduces unsprung mass and maintains rate accuracy\u003c\/p\u003e \u003cp\u003eCorrosion-resistant finish for long-term durability\u003c\/p\u003e \u003cp\u003eMade in Japan with precision quality control\u003c\/p\u003e \u003cp\u003eFunction, 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.\u003c\/p\u003e \u003cp\u003e\u003ca href=\"https:\/\/www.swiftsprings.com\/history\/\"\u003eHistory about Swift Springs\u003c\/a\u003e\u003c\/p\u003e \u003cp\u003e\u003ca href=\"https:\/\/www.f2suspension.com\/product-category\/parts\/spring\/\"\u003eSpring Options\u003c\/a\u003e\u003c\/p\u003e","brand":"Function \u0026 Form","offers":[{"title":"50K","offer_id":42880783614037,"sku":"F2-ED861063-50K","price":395.0,"currency_code":"CAD","in_stock":true},{"title":"46K","offer_id":42880783646805,"sku":"F2-ED861063-46K","price":395.0,"currency_code":"CAD","in_stock":true},{"title":"42K","offer_id":42880783679573,"sku":"F2-ED861063-42K","price":395.0,"currency_code":"CAD","in_stock":true},{"title":"38K","offer_id":42880783712341,"sku":"F2-ED861063-38K","price":395.0,"currency_code":"CAD","in_stock":true},{"title":"34K","offer_id":42880783745109,"sku":"F2-ED861063-34K","price":333.0,"currency_code":"CAD","in_stock":true},{"title":"32K","offer_id":42880783777877,"sku":"F2-ED861063-32K","price":333.0,"currency_code":"CAD","in_stock":true},{"title":"30K","offer_id":42880783810645,"sku":"F2-ED861063-30K","price":333.0,"currency_code":"CAD","in_stock":true},{"title":"28K","offer_id":42880783843413,"sku":"F2-ED861063-28K","price":333.0,"currency_code":"CAD","in_stock":true},{"title":"26K","offer_id":42880783876181,"sku":"F2-ED861063-26K","price":333.0,"currency_code":"CAD","in_stock":true},{"title":"24K","offer_id":42880783908949,"sku":"F2-ED861063-24K","price":333.0,"currency_code":"CAD","in_stock":true},{"title":"22K","offer_id":42880783941717,"sku":"F2-ED861063-22K","price":333.0,"currency_code":"CAD","in_stock":true},{"title":"20K","offer_id":42880783974485,"sku":"F2-ED861063-20K","price":333.0,"currency_code":"CAD","in_stock":true},{"title":"18K","offer_id":42880784007253,"sku":"F2-ED861063-18K","price":333.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0947\/5040\/files\/swift-springs-4x2.5-inch-coilover-springs.jpg?v=1786980645","url":"https:\/\/speedzone-web.com\/en-ca\/products\/swift-springs-4x2-5-inch-65mm","provider":"Speedzone Performance LLC","version":"1.0","type":"link"}