I have some doubts on the following: When a wheel rolls without slipping, the point of contact of the wheel with the ground is instantaneously at rest. It is sometimes useful to think of the motion of the wheel as pure rotation about this "instantaneous axis". Points [on the wheel] close to the ground have a small linear speed, as they are close to this instantaneous axis, whereas points farther away have a greater linear speed. The above is from my Giancoli physics book and accompanying the above is a picture of a bicycle wheel with the top part of the wheel blurred due to the greater speed. I understand what is happening here but I can't help to think that if all parts of the wheel aren't moving with the same speed then wouldn't the wheel suffer from some deformation? I'm guessing if the speed is relatively small, the deformation is ignorable. Any comments?