Originally Posted by
MichaelKPIT
I think you may be confusing angular velocity with linear velocity. You are absolutely right that every part of the wheel is ROTATING at the same angular velocity. The wheel as a component part of the aircraft is also moving forward, relative to the runway, at the same speed as the aircraft. However it is also rotating. The bottom of the wheel, in contact with the runway, and not moving relative to said runway, therefore has a LINEAR velocity of zero. Take another look at the image I posted above. It shows the linear velocity of a point element of the wheel as 0 when it's touching the runway and 160 km/h when it's at the top.
true, I got fixated with the term forward speed.