After looking at that page, I understand something, but I am still curious about other things.

There is no mention of air resistance at all. Does it play a role in (de)stabilizing the vehicle in higher speeds? Would a bicycle work as well in, say, lunar vacuum (I imagine that it would be hard to pedal in spacesuit, but let's assume a spherical cow and a lunar bicyclist in normal clothes). Would a lunar bicycle be more stable at lower speeds because of the lower gravity on the Moon?