BMW Z4 Roadster Owner's Handbook Manual page 284

MOBILITY
Maximum speed
If a tyre is damaged you can continue your jour‐
ney, but do not exceed a maximum speed of
80 km/h, 50 mph.
Continuing a journey with a flat tyre
Note the following if you continue a journey with
a flat tyre:
1. Avoid violent or sudden braking and steering
manoeuvres.
2. Do not exceed a speed of 80 km/h, 50 mph.
3. As soon as there is an opportunity, check the
tyre inflation pressure in all four tyres.
In the case of tyres with special approval: if all
four tyres are inflated to the correct tyre infla‐
tion pressures, the Tyre Pressure Monitor
might not have been reset. Perform a reset.
Possible driving distance with a deflated
tyre
The possible driving distance varies depending
on the load and stresses the vehicle is subjected
to, for example speed, road properties, outside
temperature. The driving distance can be shorter
or, if the driving style is more careful, longer.
If the vehicle is moderately loaded and used un‐
der favourable conditions, it is possible to travel
up to 80 km, 50 miles.
Driving properties with damaged tyres
On a journey with damaged tyres, handling char‐
acteristics change and may result in the following
situations, for example:
▷ The vehicle losing traction more quickly.
▷ Longer braking distances.
▷ Different self-steering characteristics.
Adapt your driving style. Avoid abrupt steering or
driving over obstacles, for example kerbs or pot‐
holes.
284
Wheels and tyres
Final tyre failure
Vibration or loud noises during the journey may
be an indication that the tyre has finally failed.
Reduce your speed and stop the vehicle. Parts of
the tyre could detach, which might lead to an ac‐
cident.
Do not continue driving, but contact a Service
Partner of the manufacturer or another qualified
Service Partner or a specialist workshop.
System limits
Temperature
The tyre inflation pressure depends on the tem‐
perature of the tyre.
The tyre inflation pressure increases as the tyre
temperature increases, for example during driv‐
ing or due to exposure to sunlight.
Tyre inflation pressure decreases if the tyre tem‐
perature drops.
Through this behaviour, a warning may be trig‐
gered if there are major temperature drops, due
to the given warning limits.
After a temperature-related warning, the speci‐
fied pressures are displayed again on the Control
Display after a short distance.
Sudden loss of tyre inflation
pressure
No warning can be given by the system of ex‐
treme, sudden tyre failure caused by external
factors.
Reset not carried out
Tyres with special approval: the system will not
function correctly if a reset has not been carried
out, for example, a flat tyre is reported in spite of
the correct tyre pressure.
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