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If you had to pick a wheel to put on anyone's skateboard, you'd do very well with a set of Spitfire Formula Four 99d Classics Skateboard Wheels. Unbeatable durability in a time-tested all-round shape, chances are your favorite pro is riding these.
Classic Shape – The #1 shape in skateboarding worldwide - proven for speed and control.
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.
High Rebound Compound
| Size (mm) | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 58 | 60 |
| Diameter (mm) | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 58 | 60 |
| Width (mm) | 30 | 31 | 32 | 33 | 33.5 | 35.3 | 35.3 | 35.8 | 39 |