Whenever I am riding along on a smooth road I notice that each time my wheel revolves I feel a bump. It is caused by a flat spot on the tyre of the bicycle wheel. Does anyone know what is causing the flat spot and how to fix it? I Have already deflated and reinflated the inner tube several times and had no luck, I have even taken the tyre off again to check that the tape that goes over the spoke screws is even throughout the wheel. But there is still a flat spot.