{"product_id":"progressive-fork-cartridge-kits-harley-davidson-softail-lowered","title":"Progressive Fork Cartridge Kits — Harley-Davidson Softail Heritage Classic, Softail Fat Boy, Softail (1983-2026)","description":"\u003cp\u003eProgressive Fork Cartridge Kits for 2017+ Harley-Davidson Softail models with 49mm front ends, featuring adjustable preload, progressive-rate springs, and Frequency Sensing Technology (FST) damping to eliminate brake dive and improve cornering grip. Available in 1-inch or 2-inch lowering drop.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eAdjustable preload spring tension\u003c\/li\u003e\n  \u003cli\u003eAsymmetrical design with FST damper technology\u003c\/li\u003e\n  \u003cli\u003eReduces front-end brake dive\u003c\/li\u003e\n  \u003cli\u003eImproves cornering stability and grip\u003c\/li\u003e\n  \u003cli\u003eImproves bottoming control\u003c\/li\u003e\n  \u003cli\u003eInstalls in 1 in. or 2 in. lowering configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Progressive\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 31-4009\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Suspension \/ Fork Cartridge Kits\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.3 lb\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Harley-Davidson Softail Lowered 2017+\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarning:\u003c\/strong\u003e California Prop 65 — Cancer and Reproductive Harm. www.P65Warnings.ca.gov\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits 2017 and newer Harley-Davidson Softail models equipped with 49mm fork tubes.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eDoes this come with lowering options?\u003c\/h3\u003e\n\u003cp\u003eYes — the cartridge kit installs in either 1-inch or 2-inch lowering drop to match your desired ride height.\u003c\/p\u003e\n\u003ch3\u003eWill this fit my older Softail with 39mm forks?\u003c\/h3\u003e\n\u003cp\u003eNo — this kit is designed for 2017+ Softail models with 49mm front ends only.\u003c\/p\u003e\n\u003ch3\u003eWhat is Frequency Sensing Technology (FST)?\u003c\/h3\u003e\n\u003cp\u003eFST is Progressive's damping system that responds to road bumps and braking forces separately, smoothing small ripples while maintaining control over larger impacts.\u003c\/p\u003e\n\u003ch3\u003eDo I need a tuner or other modifications?\u003c\/h3\u003e\n\u003cp\u003eThis is a bolt-in suspension upgrade that requires no engine tuning or frame modifications.\u003c\/p\u003e\n\u003ch3\u003eCan I adjust the preload after installation?\u003c\/h3\u003e\n\u003cp\u003eYes — the preload adjuster allows you to fine-tune spring tension without removing the cartridge.\u003c\/p\u003e\n\u003ch2\u003eCalifornia Proposition 65 Warning\u003c\/h2\u003e\n\u003cp style=\"font-size:11px;color:#888;\"\u003e\u003cstrong\u003eWARNING:\u003c\/strong\u003e Cancer and Reproductive Harm — California Prop 65 (Y). www.P65Warnings.ca.gov\u003c\/p\u003e","brand":"Progressive","offers":[{"title":"Default Title","offer_id":53040366911599,"sku":"T14-669281","price":2333000.0,"currency_code":"COP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_7793e046-5447-4d70-97e6-f77f67ae1f36.png?v=1779566466","url":"https:\/\/vtwinbikers.com\/en-co\/products\/progressive-fork-cartridge-kits-harley-davidson-softail-lowered","provider":"Vtwinbikers","version":"1.0","type":"link"}