The Spitfire Formula 4 Classics 101a feature an umatched abrasion resistance for fewer flat spots, and longer lasting speed no matter the terrain.

The Spitfire Formula 4 Classics arebuilt to excel in specific scenarios like a narrow or wide wheel, but its appropriate for most situation with its signature Formula 4 design. 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.