Spitfire 99a Formula 4 OG Classics 58mm Skateboard Wheels Beanie Room-to-Grow system extends the length

Room-to-Grow system extends the length of the legs by 1

making it the strongest cast truck on the market

measure circumference of extended knee and match to the sizes listed below:

Perforated fabric provides protection from the elements

Spitfire 99a Formula 4 OG Classics 58mm Skateboard Wheels Beanie Room-to-Grow system extends the length99a 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. OG Classic Shape Spitfires original cut away wheel shape.