The newest from spitfire the formula four shadowplay wheelspitfire is the worlds 1 urethane for a reasonths latest shredded wheel from spitfire is the classic shape with a new graphicall spitfire wheels are hand poured shaped and specifically engineered in san francisco only the most advanced formulas and compounds are used for all wheelsspecificationsdiameter 52mmwidth 32mmriding 155mmhardness 99ashape classicride the fire