[WHT  & BLU 56mm]

[White 54mm]

[Black 52mm]

[Off-White 52mm]

[Natural 54mm]

[Blue  & Off White 53mm]

[White 58mm]

[Off White 54mm]

[White 56mm]

Spitfire Formula Four 99D Radial Skateboard Wheels Tested by Spitfire Team riders, Formula Four Performance Urethane lasted longer, withstood more abuse and 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 and features that together produce a truly great wheel.