Greg Farris writes:

"Power" is unrelated to the gyroscopic stability in the equation. Bicycles
travel a large propoortion of the time without application of power to either
wheel.

Yes, through momentum. But this momentum is eroded by irreversible
effects such as friction with the ground and air. Eventually none is
left, and the bicycle stops.

As long as there is power to the wheel, it will compensate for any
losses, and the bicycle will continue to move. Similarly, as long as
the bicycle has momentum, it will continue to move. In both cases, as
long as the wheels retain their traction with the ground, the bicycle
will not fall.

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