Spitfire Formula Four Classics. Unmatched Speed and Control on all surfaces. Unmatched Flatspot Resistance. Smooth Anti-Stick Slide. High Rebound Compound. 100% True Performance Urethane. The Spitfire Classic is the #1 wheel shape in skateboarding. medium riding width surface with round sidewalls. Designed for control in all situations. 52mm x 32mm 99A.