The main difference between airplane and automobile wheels is that airplane wheels need to be able to rotate in both directions, while automobile wheels only need to rotate in one direction. This is because airplanes use a wheel-and-brake system for landing, where the wheel slows the plane down as it touches down on the runway. In order for the wheel to slow the plane down in both directions, it needs to be able to rotate in both directions. Automobile wheels don't need to be able to rotate in both directions because they use a different braking...