evo.com | Spitfire Skateboard Wheels > Spitfire has collected a large team of heavy hitters over the years thanks to their industry breaking wheel technology. The Spitfire Formula Four Conical Shape 99a Skateboard Wheels are another breakthrough for the company and can be seen supporting thrasher Kyle Walker. Using the infamous Formula Four Urethane, the wheel has a Conical shape to reduce the overall weight of the wheel without sacrificing performance. Try them for yourself for less flat-spots, controlled slide, and increased speed. Formula Four Urethane Unmatched abrasion resistance (no flat spots), more controllable grip, lasting speed everywhere, smooth anti-stick slide, longer lasting (holds size and shape longer). Spitfire Duro 99 The Duro 99 by Spitfire has more speed and control on all surfaces, has flat spot resistance, long-lasting anti-stick slide and a higher rebound compound. Conical Shape Wider riding surface on the wheels but cut like a cone for less weight. | Spitfire Formual Four 99d Conical Shape Skateboard Wheels 2025 - 53 in White