{"product_id":"swift-springs-standard-coilover-spring-barrel-type-id-2-5in-10in-length-progressive","title":"Swift Springs Standard Coilover Spring (Barrel Type) - ID: 2.5\" \/ Length: 10\" Progressive","description":"\u003cp\u003eSwift Springs Standard Coilover Springs (Barrel Type Progressive) in 2.5\" ID and 10\" length feature a dual-rate design that provides a softer initial rate for compliance over bumps, transitioning to a stiffer rate under load for cornering stability. These 2.5\" ID Swift progressive coilover springs are manufactured in Japan from proprietary H5S.TW high-tensile alloy steel, combining the barrel design's anti-deflection properties with variable-rate spring behavior for applications that demand both comfort and performance.\u003c\/p\u003e\n\u003cp\u003eWith over 90 years of spring manufacturing expertise, Swift Springs has engineered these progressive barrel springs for racers and enthusiasts who need the best of both worlds — a compliant initial rate for rough surfaces and a firm secondary rate for high-load cornering. All Swift coilover springs use proprietary H5S.TW alloy, delivering superior fatigue resistance and rate consistency compared to standard silicone chrome steel.\u003c\/p\u003e\n\u003ch3\u003eWhy Racers Choose Swift Springs Coilover Springs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProgressive dual-rate design: softer initial rate, stiffer under load\u003c\/li\u003e\n\u003cli\u003eProprietary H5S.TW alloy delivers superior fatigue resistance and consistent spring rates\u003c\/li\u003e\n\u003cli\u003eBarrel design eliminates spring deflection and bowing\u003c\/li\u003e\n\u003cli\u003eFewer coils reduce unsprung weight and maximize usable shock stroke\u003c\/li\u003e\n\u003cli\u003eQuicker transient response improves traction and road surface tracking\u003c\/li\u003e\n\u003cli\u003eTrusted by professional racing teams worldwide — Swift Springs coilover springs are proven in competitive motorsport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Swift Coilover Springs are sold individually. Select your desired spring rate from the options above.\u003c\/p\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003ctable class=\"table table-striped table-primary\"\u003e\n\u003ctbody\u003e\n\u003ctr class=\"spchd\"\u003e\n\u003ctd rowspan=\"2\" width=\"25%\"\u003e\u003cstrong\u003ePART #\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSPRING RATE\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eUSABLE STROKE\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eMAX STROKE\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eMAX LOAD\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"spchd\"\u003e\n\u003ctd\u003elbs\/inch\u003c\/td\u003e\n\u003ctd\u003einch\u003c\/td\u003e\n\u003ctd\u003einch\u003c\/td\u003e\n\u003ctd\u003elbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"spcrow\"\u003e\n\u003ctd class=\"spc\"\u003e100-250-500 V\u003c\/td\u003e\n\u003ctd class=\"spc\"\u003e200\/500\u003c\/td\u003e\n\u003ctd class=\"spc\"\u003e4.7\u003c\/td\u003e\n\u003ctd class=\"spc\"\u003e5.1\u003c\/td\u003e\n\u003ctd class=\"spc\"\u003e1,834\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"spcrow\"\u003e\n\u003ctd class=\"spc\"\u003e100-250-575 V\u003c\/td\u003e\n\u003ctd class=\"spc\"\u003e250\/575\u003c\/td\u003e\n\u003ctd class=\"spc\"\u003e4.9\u003c\/td\u003e\n\u003ctd class=\"spc\"\u003e5.2\u003c\/td\u003e\n\u003ctd class=\"spc\"\u003e2,143\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"spcrow\"\u003e\n\u003ctd class=\"spc\"\u003e100-250-750 V\u003c\/td\u003e\n\u003ctd class=\"spc\"\u003e300\/750\u003c\/td\u003e\n\u003ctd class=\"spc\"\u003e3.9\u003c\/td\u003e\n\u003ctd class=\"spc\"\u003e4.4\u003c\/td\u003e\n\u003ctd class=\"spc\"\u003e2,690\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Swift Springs","offers":[{"title":"500","offer_id":44167805894716,"sku":"100-250-500 V","price":145.35,"currency_code":"USD","in_stock":true},{"title":"575","offer_id":44167805927484,"sku":"100-250-575 V","price":145.35,"currency_code":"USD","in_stock":true},{"title":"750","offer_id":44167805960252,"sku":"100-250-750 V","price":145.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0000\/2183\/files\/100-250-500V.jpg?v=1775244299","url":"https:\/\/www.springrates.com\/products\/swift-springs-standard-coilover-spring-barrel-type-id-2-5in-10in-length-progressive","provider":"SPRINGRATES®","version":"1.0","type":"link"}