BMW 2 Series Owner's Handbook Manual page 297

Use
Use only in pairs on the rear wheels, equipped
with the tyres of the following wheel/tyre sizes:
Tyre size Wheel size
225/50 R17 7.5J x 17
225/45 R18 7.5J x 18
The information on wheel size and rim offset is
located on the inside of the wheel.
The list can also include wheel/tyre sizes that
are only suitable for certain models.
Information about approved wheels and tyres
for the vehicle can be requested from a Service
Partner of the manufacturer, or another quali-
fied Service Partner or specialist workshop.
Observe the snow chain manufacturer's in-
structions.
If equipped with a Tyre Pressure Monitor: do
not reset the Tyre Pressure Monitor when us-
ing snow chains. Otherwise, incorrect values
may be displayed.
If equipped with a Flat Tyre Monitor: do not ini-
tialise the Flat Tyre Monitor when using snow
chains. Otherwise, incorrect values may be dis-
played.
When driving with snow chains, briefly activate
Dynamic Traction Control as needed to opti-
mise propulsion.
Maximum speed with snow chains
When snow chains are fitted, do not exceed
50 km/h, 30 mph.
Tyre Pressure Monitor
Principle
The Tyre Pressure Monitor monitors the tyre
pressure and issues a warning if the tyre pres-
sure has dropped.
Rim offset (IS)
30
25
Online Edition for Part no. 01405A5E758 - VI/22
Wheels and tyres
General
Sensors in the tyre valves measure the tyre
inflation pressure and tyre air temperature.
Depending on the tyres detected or entered,
the system displays the specified nominal
pressures on the control display and compares
them to the current tyre inflation pressures.
If the vehicle is fitted with tyres which are not
listed in the tyre inflation pressure information
on the vehicle, for example tyres with special
approval, the system must be actively reset.
The current tyre inflation pressures are then
accepted as the nominal pressures.
When operating the system, please also com-
ply with the information and notes in the chap-
ter on tyre inflation pressure.
For further information:
Tyre inflation pressure, see page 286.
Safety information
WARNING
The display showing the nominal pressures
does not replace the tyre inflation pressure
information on the vehicle. If incorrect data
has been entered into the tyre settings, the
specified tyre inflation pressures will also be
incorrect. As a result, reliable message of a
tyre pressure loss can no longer be guaran-
teed. There is a danger of injury or material
damage. Make sure that the tyre sizes of the
fitted tyres are displayed correctly and that
they match the specifications on the tyres
and in the tyre inflation pressure information.
Operating requirements
The following requirements must be met for
the system, otherwise reliable message of a
tyre pressure loss is not ensured:
▷ After each tyre or wheel change, the sys-
tem has detected the fitted tyres, updated
MOBILITY
297