Comment by fluoridation

>Bicycles achieve balance because the rider counter-steers to prevent the bike from falling aside.

This is only partially correct. A rider can compensate for road irregularities to keep the bike upright, where an uncontrolled bike would topple over, however an uncontrolled bike is stable when rolling on flat terrain. That there exist bikes that, by making countersteering impossible are unridable, doesn't support the proposition that countersteering is the primary mechanism by which a bike stays upright, it just shows that countersteering can have a much more powerful effect that the dynamics of angular momentum.