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BMW stopped using tyre pressure sensors circa 2003. They use the wheel speed sensors to detect a flat or loss of pressure in a wheel, as a lower inflated tyre/flat tyre turns slower in relation to the other wheels. Oh and that stuff about BMW saying that the car was designed to work with runflats. As long as you dont do silly tyres sizes away from the original tyre sizes possible, as written on the door pillar you will be fine. A BMW dealer will be quick to sell you a set of Alpina or AC Schnitzer rims which come with normal tyres. So they contradict themselves a little.
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