Skateboard Parts Spitfire Formula Four Classic Skateboard Wheels (Set of 4) Review March 28, 2018July 13, 2018 GiantPandaisy 0 Comments Outdoor Recreation, Skateboarding, Skateboards & Scooters, Skates, Spitfire, Sports & Outdoors Durometer: 99A Diameter: 50mm Durometer: 99A Diameter: 50mm