Spitfire Formula Four 99A Zion Cosmic Classics Wheels 53mm Natural put Formula Four 99A urethane into the Classic shape, the number one wheel shape in skateboarding: a medium-width riding surface with round sidewalls, designed for control in all situations. Formula Four 99A is made for speed and lasting control on all surfaces, and it's one of Spitfire's most ridden duros worldwide.
At 53mm x 33mm, with a 16mm riding surface, this mid size is the go-to for street and park. It's Zion's pro model. Sold as a set of 4.