Why is it misleading to say that single-track vehicles like motorcycles mainly lean and stay stable because their wheels act like gyroscopes?

Answer: Not the main cause

Gyros do most of it — This is the attractive myth: spinning wheels look powerful, so it is easy to credit gyros with most of the job. But a single-track vehicle still needs tire forces, road support, lean, and steering inputs to follow a curve. The gyro story hides the tire-contact and geometry work that actually dominates.

Gyros steer for the rider — Steering is still essential. Countersteering starts the lean at speed, and the front wheel then settles toward the angle needed for the turn. Even riderless self-stable bicycles recover by steering into a fall; the wheels do not simply steer for the rider.

Not the main cause ✓ — Correct. Gyroscopic effects can influence steering feel and help the front wheel return, but models and experiments show they are not the main source of lean or a necessary explanation for single-track stability. The stronger lesson is that tire contact, steering geometry, and lean dynamics do the dominant work.