Please forgive me if this is a bonehead question, but I must know. Obviously, when pedalling backwards, or just rolling forwards, there is no connection between the pedals and the wheel, the pedals remain stationary. However, when pushing my bike backwards the pedals are connected, and of course, spin. Not that I ride my bike backwards. I have yet to go down a hill this way. But if I did, my feet would have to keep up with the pedals as they spun out of control. Why is this?