Conical Full shape wheels from Spitfire. Formula 4 Urethane. More speed and control on all surfaces, unmatched flatspot resistance, smooth anti-stick slide, high rebound compound, 100% true performance urethane. Conical Full is a wider version of the conical shape. Wide riding surface, cut in sidewalls to decrease weight. A solid, controllable shape for all terrains. 58mm x 37mm.