How a bicycle stays upright

A demonstration using two gyroscopes cable tied together and both rotating in the same direction, simulating a bicycles ability to remain upright without the need for forward motion or the self leveling effect of the steerable front wheels action against the surface. In this example the wheels (gyroscopes) are obviously not in contact with the surface as they are surrounded by a supporting frame so the self correcting effect of a steerable front wheel is effectively eliminated which would normally help to level a conventional bicycle at slow speed. See also the TMS bicycle http://youtu.be/cVszVAZoTBU for a nice demonstration of the steering self leveling effect but with all gyroscopic action effectively eliminated though this effect is dependent on forward motion of the bicycle. Now have a look at this video demonstrating the gyroscopic effect in action on a real bicycle with forward motion eliminated and at end of the video a good demonstration of the steering effect almost completely removed. http://youtu.be/3WCUN7-nezQ I think the solution is a combination of all three actions as follows:- 1) With very little or no forward motion or wheel angular momentum, a normal bicycle will rely on course manual corrective steering in order to keep it upright. Which may include a center of gravity shift by the rider. 2) When the bicycle is traveling forward, auto corrective steering can stabilise the bicycle using the friction of the front wheel against the surface as it drops and turns. 3) When the bicycle's speed is increased, angular momentum (gyroscopic action) and forward momentum take over and keep the bicycle upright.