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I agree with chris and raidman, check the rims to see if they are warped. most (all?) of the rims on the 700s are aluminum composites. this means two things:
1) when and if they are bent they often split or break... I have one in my garage that split between two spokes when I went through a pothole. So damned annoying.
2) they can warp fairly easily if the nuts are tightened down unevenly.
take the car back to the tire shop and have them attempt to balance the new tires on the rims. if the rims are warped balancing will be impossible. you can then either buy a new rim to replace any warped ones, or go to a metal shop that can straighten it (ys, as hard as it is to believe, aluminum rims can be straightened by dudes that know how). if you choose the latter ask the chief tire guy at the shop if he knows a place in the neighborhood... he will almost assuredly have a place he uses.
on a sidenote, there is a solution that doesn't involve any of the aformentioned. I have two warped rims on my 1985 745t right now and have no shimmy. the trick is to rotate the warped rims to the rear and make sure you have two good rims upfront. the two in the rear will still be warped, but you won't notice it at all (sine it isn't affecting the steering tires). cheapo work around for those of us not excited by the propsect of purchasing new rims at $300+ a pop.
good luck,
rick
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