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Most (all?) models BMW sells in the USA use TPMS in the wheel. In some other markets, they use the computer and the tire rotation variances to detect if a tire is going flat. The TPMS with sensors is a more accurate alert to a slow air leak than the version that uses variances in tire rotation rates, as with a RFT, it has to lose a lot of pressure before it starts to sag much. The sensor in the wheel will alert much sooner, but if it is a big leak, that point may be mute.
Our user manual tends to show both USA and Canada option descriptions...make sure you are reading the section for the USA.
You can probably tell if you look at the filler valve...most of the time they use a rubber fill valve only if it uses the tire rotation...the valve stem with TPMS in the wheel, use a metal stem.
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