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Originally Posted by B&DCalgary
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.
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I never said it didn't work with non-run flat tires. I simply stated that non runflat equipped BMW's did not ship with a flat tire warning mechanism, unlike the X3 and 3 series models equipped with run-flats...