been a few months, was this solved? When the dealer put on tires from another X5 it was obviously with different rims too. Are you sure your set of rims aren't to blame? Cause that's likely the reason why mine vibrate at highway speeds too. I had Proxes ST1 on before, same rims, and it vibrated. I got STIIs on the same rims and the vibration continued despite multiple balances including road force. I'm conviced it's a rim in the rear that's out of round, but I don't drive highway often enough to spend another few hundred.. at least not yet.
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