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I tried one time, as part of an experiment, to ride a bike with a fixed handle bar. Impossible. So, in any case, our movements made with the handlebar helps us in not falling down. I can feel kinda how, but cannot really put a finger on it. Does anybody know the answer?

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  • $\begingroup$ How does your personal inability to perform this act constitute a proof that it's impossible? $\endgroup$ – CuriousOne May 22 '16 at 9:08
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    $\begingroup$ Possible duplicate: Why doesn't a bike/bicycle fall if going with a high speed? $\endgroup$ – lemon May 22 '16 at 9:16
  • $\begingroup$ Is it really impossible at a high speed? Getting started could be tricky, but at speed you can ride hands free. I wonder whether you still need to allow the handle bar to turn $\endgroup$ – innisfree May 22 '16 at 9:27
  • $\begingroup$ @innifree: Every circus probably has half a dozen people who can take a nap on a unicycle... I think the OP needs to take a closer look at what people can do who are actually not giving up after five minutes. $\endgroup$ – CuriousOne May 22 '16 at 9:35
  • $\begingroup$ Related: physics.stackexchange.com/q/24/2451 and links therein. $\endgroup$ – Qmechanic May 22 '16 at 9:47
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You can't ride it because it's very thin and so is bound to fall over to one side or the other.

A more difficult question is why you can ride a bike in normal circumstances. That has already been discussed on this site but as you would expect the answer is related to the steering mechanism.

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