Spitfire Wheels Formula Four F4 Classic 99D 52mm
Spitfire Wheels F4 Classic Size: 52mm Hardness: 99d Classic Shape – The #1 shape in skateboarding worldwide - proven for speed and control. 99a Durometer – More speed and control on all surfaces. Unmatched flatspot resistance. Smooth, anti-stick ride. 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. High Rebound Compound SIZE WIDTH RIDING SURFACE 50MM 30MM 14.5MM 51MM 31MM 15MM 52MM 32MM 15.5MM 53MM 33MM 16MM 54MM 33.5MM 16.5MM 55MM 35MM 17.5MM 56MM 35.3MM 17.8MM 58MM 35.8MM 18MM 60MM 33.9MM 21.5MM