evo.com | Spitfire Skateboard Wheels > The Spitfire Formula Four 99a OG Classic Skateboard Wheels have been around the block once or twice, and they do a dang good job of it too. 99a Durometer More speed and control on all surfaces. Unmatched flatspot resistance. Smooth, anti-stick ride. High-rebound compound. Formula Four Urethane Formula Four urethane is unlike any other. Both in the streets and under high-speed stress tests in Spitfire's lab, Formula Four wheels retained more material, coned less and kept their original shapes and sizes longer than any other wheel. Classic Shape The #1 shape in skateboarding worldwide - proven for speed and control. Spitfire Cheapshots Bearings: All the speed you want without the hole in your wallet, the Spitfire Cheapshots Bearings are the ones to grab. | Spitfire Formula Four 99a OG Classic Skateboard Wheels 2026 - 55 Package (55 mm) + Bearings