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MiCk,
I dunno what an alignment has to do with wheel shimmy at 55-65?
Wheel shimmy diagnosis is like chasing poltergiests...
-The shimmy is induced or, apperent/exacerbated by the new wheels, as you did not state you noticed shimmy before with your 17s.
-I'd have your wheel guy re-check/re-do the balance job and recheck the wheel and tire runout.
-That brake job 5-7k miles ago: you may have some rotor thickness variation, which is simply now noticeable, magnified by the 20s.
-JV mentioned trans and drive line; poss.imo, but a tough "check"
I'd also have front suspension bushings checked, but be leary, as it won't be a hard task for someone to diagnose "bad" control arms, bushings,etc., which may or, may not have anything to do with the recently noticed shimmy.
Does the steer. wheel shimmy, at speed, under hard/vigorous braking?
I still think it is wheel/tire/brake rotor or, some combo, connected...my 2Cts
GL with this hunt: wheel shimmy at speed is a real PIA.
GL,mD
PS: OT...read ya'll in a few days again...I can barely make this site work, lately.
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