The concept

The system does not measure the actual inflation pressure in the tires.

It detects a pressure loss in a tire by comparing the rotational speeds of the individual wheels while moving.

In the event of a pressure loss, the diameter and therefore the rotational speed of the corresponding wheel change. This is detected and reported as a flat tire.

    See also:

    Requirements
    ▷ The installed BMW Assist system is logged in to a wireless communications network. This network must be capable of transmitting the services. ▷ To transmit position data, the vehic ...

    2011 BMW X3 Review by Mike Hanley
    The BMW X3 may have been a pioneer among compact luxury crossovers, but a number of competitors — including the Audi Q5, Mercedes-Benz GLK-Class and Volvo XC60 — have entered the fray since its de ...

    Drivetrains
    The 528i, 535i and 550i are rated at 240, 300 and 400 horsepower, respectively. The turbocharged version of the 3.0-liter inline-six-cylinder in the 535i makes the 550i superfluous, rocketing the ...