
New formula four wheels from spitfire. Formula Four Performance Urethane lasted longer, withstood more abuse & performed superior to all other wheels. 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 Fours True lasting Performance Urethane comes not from a single benefit, but from a combination of qualities & features that together produce a truly great wheel