I just finished a SF-LA tour, during which I felt a constant (and rather infuriating) front end wobble, or shimmy, even at relatively low speeds. I've toured plenty before on my 80s Schwinn World Tour, without this problem, but this was the first I'd tried it with a front rack & panniers. My rack is an old Blackburn Mtn. rack, which is NOT a lowrider. Would a lowrider-type rack help (lower center of gravity)? Less weight on the front? More weight on the front? Any suggestions would be helpful.
(I searched "shimmy" and "wobble" on both Google and Bikeforums, and came up with few answers, so hopefully this one'll help future searchers!)