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Why doesn't the bike fall if going with a high speed?

How does a bike stay upright? I know there are various theories involving castor effects, and gyroscopic motion but as far as I'm aware no one knows for certain how a bike stays up right.

What is the best theory right now?

  • $\begingroup$ see here for answer $\endgroup$ – Jack Jan 30 '12 at 14:49
  • $\begingroup$ The paper here clearly answers most of your questions. The title is apt which states > A Bicycle Can Be Self-Stable Without Gyroscopic or Caster Effects sciencemag.org/content/332/6027/339.abstract $\endgroup$ – Jack Jan 30 '12 at 14:51

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