Tested by Spitfire Team riders & used by The FSTL Team, Formula Four Performance Urethane lasts longer,
withstands more abuse and performes superior to many 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 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