evo.com | Spitfire Skateboard Wheels > Burn through the streets on the Spitfire Formula Four 97a Classics Skateboard Wheels. Formula Four Urethane lasts longer and withstands more abuse for wall to wall skating. 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. High Rebound Compound Classic Shape The #1 shape in skateboarding worldwide - proven for speed and control. | Spitfire Formula Four 97a Classics Skateboard Wheels 2026 - 56