Spitfire F4 Hellfire Lock-In Wheels Set Black Orange 53mm/99a
Tested by Spitfire Team riders, Formula Four Performance Urethane lasted longer, withstands more abuse and performs 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 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.