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I’m not sure I understand your point, since actual measurement size differences between brands is common. It only seems significant if you plan to mount two different brands or types of tires on your car at the same time.
BMW wants all the tires to match diameters within about 2.0-2.5mm to keep the xDrive happy and not cause issues. If all the tires on the car are all the same brand, type and measured size, the actual diameter may be larger or smaller than OEM and it will not hurt the xDrive.
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