The Autobahn California 82a Black Wheels is a 63mm wheel. This is a smaller downhill wheel designed to fit a more crossover longboard or cruiser. Featuring our Slideline formula in an 82a hardness center set wheel with 36mm contact. Our Slideline formula was developed to create the fastest downhill wheels available while still retaining the ability to throw into a controlled, smooth slide. More then a soft urethane to cruise on, these are high-performance downhill slide wheels worthy of the Autobahn name.