After an expensive trip to replace all 4 tyres on New Year's Eve, I can confirm that my xDrive rear wheel adjustments consisted of both toe and camber. They were out by quite a margin it seems. The alignment operator hadn't done an X1 before, but commented that it was fairly similar to the 3 series. There was an eccentric bolt to adjust for the camber, and 3 bolts to allow the bottom arm to be adjusted for the rear toe. The front required a minor tweak to the steering rods for the front toe. I'm afraid I don't know for sure if the sDrive has rear adjustments, but I don't see why it shouldn't be a similar suspension setup to the xDrive underneath...
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