![Spitfire Formula Four OG Classics 99a 55mm](http://shop.cjsskatepark.com/cdn/shop/products/Spitfire-F4-55mm-99a-OG-CLASSICS_{width}x.jpg?v=1630793598)
Spitfire Formula Four OG Classics 99a 55mm
The Spitfire Formula 4 OG Classics come in at 55mm in diameter and a durometer of 99a. This provides an all-around wheel with a faster roll speed and more slide to it!
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!