Why does a bicycle stay more stable when it is moving than when it is stopped?

A bicycle stays upright while moving primarily through active steering control^[2]. When a bike leans, the front wheel naturally steers into the direction of the fall, which generates forces that bring the wheels back under the center of gravity^[1][2]. This self-correcting effect is largely driven by the bike's steering geometry and the position of its center of mass, rather than gyroscopic forces, which are actually quite small^[2][4].

Think of it like hopping on one foot to maintain balance; each movement allows you to place your foot in a new position to correct your posture^[2]. A common misconception is that the spinning wheels act like a massive gyroscope to hold the bike up, but experiments show that canceling these forces makes no difference to a bike's stability^[2].