Quote:
Originally Posted by ersin
No runflats for the M3. The other 3 series come with runflats standard. I believe all new cars must have a tire pressure monitoring system of some kind by federal regulation. I do not know details of this regulation. Maybe with runflats you do not need the pressure monitoring.
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As OzStriker pointed out, all cars sold in US must now use TPMS. This is regardless of whether the car has runflats or not.
Many (most?) regions of the world only require the simpler FTMS, which BMW actually prefers for it simplicity.