Gyroscopic effects 

Gyroscopic effects do play a role in bike steering, I think, but it is a rather technical issue, more suitable for a more technical exposition of than for the wikipedia article

In order to get to the required lean, the bike must roll. The front wheel acts like a gyroscope wheel: when there is roll, the wheel's gyroscopic response is to yaw. (For definitions, see pitch, roll, yaw.) I rather suspect that this contributes to the fact that it is possible to steer a bicycle accurately without hands on the handlebars. I also suspect that the gyroscopic effects contribute to the experience of effortlessness of well executed countersteering.  | Talk