Just got back from seeing The Tour of Britain cycle race come through Wigton, replete with all the big names. If you can figure out who's who then you're doing better than me. It brings up another hoary old chestnut in Physics - what keeps a bicycle stable when you're going along? I'd have gone for angular momentum. Apparently most theories until recently have centred on the motion of a gyroscope. This is something I used to understand but since I've never taught it I'm struggling a bit at the moment. However, look at this: http://www.popularmechanics.com/outdoors/sports/physics/physics-of-a-riderless-bike It looks reliable as there is a link to a scientific paper on the Science website.
