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

Why is it that, when we ride bicycle at good speed, it is perfectly balanced and we don't fall. But we lose balance when we ride bicycle at lower speeds.

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    $\begingroup$ Because the movement of the handlebars will make the moving bicycle tilt, and you can compensate for falling. But on a stationary bicycle, moving the handlebars doesn't do anything. This is answered many places. $\endgroup$ – Ron Maimon Aug 28 '11 at 20:53
  • $\begingroup$ @Ron Maimon: Sorry, I didn't get you. $\endgroup$ – claws Aug 28 '11 at 20:59
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    $\begingroup$ Because when you are going forward, if you turn the handlebars to the right, you tilt to the right. If you turn the handlebars to the left, you tilt to the left. You can compensate for falling by tilting the handlebars. On a stationary bicycle, turning the handlebars doesn't help prevent falls. This is answered many places. $\endgroup$ – Ron Maimon Aug 28 '11 at 21:18
  • $\begingroup$ @claws: Instead of falling left, you turn the handlebar left, you go left and thus you prevent you from falling left. A still bicycle does not turn left or right. $\endgroup$ – Vladimir Kalitvianski Aug 28 '11 at 21:26
  • $\begingroup$ Isn't this due to the spinning of the wheel acting like a gyroscope and resisting turning/falling over? $\endgroup$ – spongefile Feb 19 '13 at 7:30