Spitfire Fade 80HD Formula Wheels. 80HD is a Fast, soft and responsive. Reformulated 80 Durometer performance urethane, mechanically bonded to a lightweight inner core for true bearing seating and smoother, more consistent speed wherever you need it. The Conical Full is a wider version of the Conical Shape. Wide riding surface, cut in sidewalls to decrease weight. A solid, controllable shape for all terrains. 55mm x 35mm, with a 24mm riding surface 80HD.