No... but you know what I mean... How in the heck do I explain this? The plane starts moving forward, right? which means the wheels start moving forward, right? But then the belt moves backwards, so the wheels have to roll backwards too, but the plane is moving forward because it is pushing on the air. As I read it, the belt moves in such a way as to counter the rotation of the wheels. So - for every rotation of the wheel, the belt moves the exact circumference of the wheel. If however, the wheel slides on the belt, the belt does not notice that - in my mind (which I will admit is sometimes, well.... I mean - I am taking off with my kids to ride my bike 20,000 miles after all...) the belt matches the ROTATION of the wheel, not the MOTION of the wheel!!