The Spitfire Formula 4 Classics are built to excel in specific scenarios like a narrow or wide wheel, but it’s appropriate for most situations!
Spitfire’s Formula Four Performance Urethane lasts longer, withstood more abuse and performed superior to all other wheels. Formula Four Urethane was developed to combine all the desired properties of a performance wheel without sacrificing any one attribute at the expense of another. Formula Four’s True lasting Performance Urethane comes not from a single benefit. However, from a combination of qualities and features that together produce a truly great wheel.
Formula Four Performance Urethane is unlike any other. Formula Four wheels retain more material, coned less and keep their original shapes and sizes longer than any other wheel.
- Diameter: 54mm
- Durometer: 99a