Join Date: Jul 2002
Location: Oxford, UK or Mountain View, Ca
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Is the sound once per revolution, or faster e.g. chain link speed, as Toki suggested above?
I had a problem similar to this some time ago. It turned out to be a badly worn hub bearing. Worth checking, but of course there is no guarantee that it the problem. It is also worth checking for loose spokes.
Hope you find it,
Get a bicycle. You will certainly not regret it, if you live.