Try to balance a one-rupee coin on its edge. It’ll topple over. However, if you flick it with your finger and make it spin it’ll stand on its edge while it is spinning. Why?
While the coin is spinning its centre of gravity runs straight down through it from edge to edge, keeping the spinning coin in place and balanced However, when it slows down, its centre of gravity falls outside its base and it topples over. You are able to ride your cycle because when the wheels are moving they can balance on edge and keep the cycle upright. When the wheels stop moving the cycle topples over.
Picture Credit : Google
