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Sounds like you either have bad tires (happens every now and then) or the wheels are bent. The dealership is giving you a smoke story with the your X doesn't have the correct options to runs 20s.
Also if the tires are balanced perfectly on a road force and the bores are correct then they are not the cause of your vibrations. I would inspect the control arms, ball joints, tie rod ends etc to insure they are not excessively worn.
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