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Those wheels are expensive enough to justify getting a second opinion. There is a machine called something like roadforce or similar (sorry I can't remember the name) that will measure the run out in a rim, maybe you will find a Mercedes or BMW dealer around there that will have one. If the tire shop is just guessing because when they try to balance the wheel and it is asking for a lot of weight then definitely take it somewhere that won't mind swapping the tires from wheel to wheel to at least eliminate the tire as the issue.
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