![Spitfire Formula Four Conical 101A](http://skateworks.com/cdn/shop/files/sf-cp-wh-d2-f4-101-conical-fall16_e48d92d6-d9b7-4dc4-8da5-788e2739b2e8_{width}x.jpg?v=1713223728)
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.