Possibilities:
Out of balance wheel, though that is usually noticable at any speed.
Out of alignment. This one gets my vote, if the wheels and spacers check out.
Busted belt on a tire. Like balancing, it's usually noticeable regardless of speed.
Fix-a-flat in a tire. Never ever use this crap. You can't repair the tire afterwards, and it leaves a chunk of crap in the tire that has to be removed.(Don't ask. I don't want to talk about it.)
Worn shocks or struts. #2 on my list of possibilities.
Good luck.
Kirk B.
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