The Spitfire Formula 4 Classics are built to excel in specific scenarios like a narrow or wide wheel, but it’s appropriate for most situation with it’s signature Formula 4 design.

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

Features:

• Diameter: 54mm
• Durometer: 99a