Formula Four is Spitfire's top-tier urethane and the reason why half the world rides these wheels. They don't flat spot when you power slide, they don't lose speed when they heat up, and they last much longer than most.
These are 52mm in 99A, the most common combination in street skating. Small size to gain speed quickly for flips, and medium-high hardness that slides well without becoming slippery on smooth surfaces.
The Radial cut is the brand's classic, with a slightly rounded edge. It has enough contact to grip on grinds and slides without sticking, and it's the cut that works well almost everywhere.
