Spitfire F4 99 Conical Yellow Print 52 Spitfire Wheels $ 38.00 Default Title - $ 38.00 Quantity This product is currently sold out. Please fill in the form below if you'd like to be notified when it becomes available. Spitfire's premium formula four urethane in a conical shape - Full riding surface without the weight. Symmetrical, cut in sidewalls for speed, control and slide when you need it. Formula Four Urethane - Resists Flatspots 52mm Wheel Set of 4. 99a Durometer Conical Shape