{"product_id":"spitfire-f4-classic-55mm-99a-wheels","title":"SPITFIRE FORMULA FOUR CLASSIC 55MM 99D (Set of 4)","description":"\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003eSpitfire Formula Four \u003c\/span\u003e\u003cspan\u003eClassic wheels are a \u003c\/span\u003e\u003cspan\u003eworkhorse setup built \u003c\/span\u003e\u003cspan\u003eon Spitfire's \u003c\/span\u003e\u003cspan\u003eindustry-leading F4 \u003c\/span\u003e\u003cspan\u003eurethane. Formula \u003c\/span\u003e\u003cspan\u003eFour is the pro \u003c\/span\u003e\u003cspan\u003estandard: more speed \u003c\/span\u003e\u003cspan\u003eand control on every \u003c\/span\u003e\u003cspan\u003esurface, unmatched \u003c\/span\u003e\u003cspan\u003eflat-spot resistance, \u003c\/span\u003e\u003cspan\u003ea smooth anti-stick \u003c\/span\u003e\u003cspan\u003eslide, and a \u003c\/span\u003e\u003cspan\u003ehigh-rebound compound \u003c\/span\u003e\u003cspan\u003ethat — in both street \u003c\/span\u003e\u003cspan\u003euse and Spitfire's \u003c\/span\u003e\u003cspan\u003ehigh-speed lab tests \u003c\/span\u003e\u003cspan\u003e— keeps its shape and \u003c\/span\u003e\u003cspan\u003esize longer than any \u003c\/span\u003e\u003cspan\u003eother wheel. That \u003c\/span\u003e\u003cspan\u003edurability makes a \u003c\/span\u003e\u003cspan\u003epremium set like this \u003c\/span\u003e\u003cspan\u003ea genuine value over \u003c\/span\u003e\u003cspan\u003etime.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eAt 55mm, these \u003c\/span\u003e\u003cspan\u003erun the Classic shape \u003c\/span\u003e\u003cspan\u003e— the #1 shape in \u003c\/span\u003e\u003cspan\u003eskateboarding \u003c\/span\u003e\u003cspan\u003eworldwide, with round \u003c\/span\u003e\u003cspan\u003esidewalls and a \u003c\/span\u003e\u003cspan\u003emedium profile proven \u003c\/span\u003e\u003cspan\u003efor speed and control \u003c\/span\u003e\u003cspan\u003ein every situation. \u003c\/span\u003e\u003cspan\u003eThe 55mm diameter is \u003c\/span\u003e\u003cspan\u003ea versatile \u003c\/span\u003e\u003cspan\u003eall-around size, \u003c\/span\u003e\u003cspan\u003egiving you a touch \u003c\/span\u003e\u003cspan\u003emore roll speed than \u003c\/span\u003e\u003cspan\u003ea 53–54mm without \u003c\/span\u003e\u003cspan\u003emoving into a bigger \u003c\/span\u003e\u003cspan\u003esetup. The 99a \u003c\/span\u003e\u003cspan\u003edurometer hits the \u003c\/span\u003e\u003cspan\u003esweet spot: fast and \u003c\/span\u003e\u003cspan\u003eslidey like a harder \u003c\/span\u003e\u003cspan\u003ewheel, but forgiving \u003c\/span\u003e\u003cspan\u003eenough for everyday \u003c\/span\u003e\u003cspan\u003eterrain. Sold as a \u003c\/span\u003e\u003cspan\u003eset of four.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003e\u003cspan\u003eSpecs:\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\"\u003e\n\u003cli\u003e\n\u003cspan\u003eDiameter: 55mm\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eDurometer: 99a (marked \"99D\" in Spitfire's branding)\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eShape: Classic (round sidewalls, medium profile)\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eFormula: Spitfire Formula Four (F4)\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eTerrain: Street \/ park \/ all-terrain\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eMade in: USA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eBrand: Spitfire Wheels\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eSold as: Set of 4\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eNeed bearings, trucks, or hardware to finish a build? Grab them at checkout, or ask us in-store and we'll set you up.\u003c\/span\u003e\u003c\/p\u003e","brand":"Stamford Skate Shop","offers":[{"title":"Default Title","offer_id":46502875463816,"sku":null,"price":54.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0657\/7825\/3960\/files\/Screenshot2026-09-09at11.35.23AM.png?v=1788971738","url":"https:\/\/stamfordskateshop.com\/products\/spitfire-f4-classic-55mm-99a-wheels","provider":"Stamford Skate Shop","version":"1.0","type":"link"}