I see, because of reading the above thread about normal bikes I thought I was still in that subthread and I thought you were talking about the ordinary wheels at ordinary wheel speeds. My bad.

[BTW, the article I linked to mentions that the gyroscopic effect is not solely responsible for stability in ordinary bicycles. There is a site of a guy easily riding a bicycle with an opposite turning plate next to the front wheel to cancel out the gyroscopic effect demonstrating this, although I can't find it.

Edit. Here: http://www2.eng.cam.ac.uk/~hemh/gyrobike.htm ]