![Spitfire Formula Four Conical Full 99A](http://skateworks.com/cdn/shop/products/sf-cp-wh-formula-four-99-conical-full-fall14-REVISED_{width}x.webp?v=1680213555)
High Rebound Compound
Formula Four Urethane – Formula Four urethane is unlike any other. Both in the streets and under high-speed stress tests in Spitfire's lab, Formula Four wheels retained more material, coned less and kept their original shapes and sizes longer than any other wheel.