Spitfire 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, but from a combination of qualities and features that together produce a truly great wheel.
More speed and control on all surfaces
Unmatched flatspot resistance
Smooth anti-stick slide
High rebound compound
101 Durometer
100% True Performance Urethane
Classic Shape