Spitfire Bighead Skate Wheels in 57mm. Wider riding surface Full control Not just another pretty face 53mm Diameter 99A Durometer Set of Four Expertly crafted for maximum performance, Spitfire Bigheads Wheels provide an exceptional riding experience. With a wider riding surface, these wheels offer full control for the rider. But it's not just about looks, these wheels are durable and built to last. These 53mm wheels have a 99A durometer, making them versatile for all types of skating. Trust in a set of Spitfire Skateboard Wheels to elevate your skating game.