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like what sexy accord said, depends where ur bmw was from. if it was imported from the states, look at the valve stem with the cap off. the stem closes to the wheel should look like it has hex sides as if u can put a hex socket over it. if so, and its silver, then its a tpms sensor.
if u dont see it, then the beamer doesnt use the tpms sensor system, but a rolling diameter measure system (yeah computers can do that). in which it means u just gotta make sure ur new wheels overal diameter is same or very similar to ur original size (which means dont go over size, and make sure ur running the right size rubber to the right size wheel
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