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Originally Posted by xx3
This is referring to the run-flats and the tire pressure monitoring system. This is unique to BMW's with runflat tires as the car compares wheel rotations from what they are to what they should be in order to detect a flat. BMW's without run-flats don't have a calibration system and I guess are able to manage by themselves..
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Good info, except incorrect on this point. The tire pressure monitoring system works on all wheel combinations, regardless or whether they're run-flats or not. Once calibrated, it measures a change in wheel rotation speed relative to the other wheels on the vehicle.