Formula Four - 99D Lock-Ins

Poured with Spitfires Formula Four urethane, Spitfire Lock-In Full wheels are a wider version of the Lock-In Shape. Asymmetrical design with conical cut outside for less weight. Straight edge lock-in inside for control on all terrains. Formula Four urethanes high rebound compound features unmatched flatspot resistance and smooth anti-stick slide. 57mm x 40mm, 99A.