Join Date: Apr 2002
Location: Montréal (Québec)
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Hanging the bike doesn't make any difference, except for scratches on the finish of the rims.
I suspect you might have loose spoke(s). Either your wheel is undertensioned, or you hit a bump, the rim has taken a beating and 1-2 spokes are loose. Pluck the spokes. Those on the right should be very tight, whereas those on the left should be less tight, but not too loose.
Another related problem is that your wheel might wobble if you spin it around.
Basically, true the wheel -- or have it trued -- and it should be ok.