SPITFIRE FORMULA FOUR CLASSICS GONZ SHMOOS 99A (56MM)
Formula Four Performance Urethane lasts longer, withstands more abuse and performs superior to all other wheels. Spitfire's 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.