BMW Z4 Roadster Owner's Handbook Manual page 273

Swapping over front and rear
wheels
Swapping the front wheels with the rear wheels
or vice versa is not permitted on vehicles with
different tyre or rim dimensions on the front and
rear axles.
Storing tyres
Tyre inflation pressure
Do not exceed the maximum tyre inflation pres‐
sure indicated on the tyre's side wall.
Tyre storage
Store wheels and tyres in a cool, dry and dark
place when not in use.
Protect the tyres against contamination from oil,
grease and solvents.
Do not leave tyres in plastic bags.
Remove dirt from the wheels or tyres.
Run-flat tyres
Principle
In the event of a complete loss of tyre inflation
pressure, run-flat tyres enable you to continue
driving, with certain restrictions.
General
The wheels are fitted with tyres which are self-
supporting to a limited degree. They may also
have special rims.
The reinforced side wall means that the tyre
keeps the vehicle mobile to a degree even if tyre
inflation pressure has been lost.
Observe the notes on continuing to drive with a
flat tyre.
Wheels and tyres
Online Edition for Part no. xxx - X/18
Safety notes
WARNING
A run-flat tyre which has low tyre inflation pres‐
sure or no tyre inflation pressure at all will
change the vehicle's handling characteristics,
for example there may be reduced directional
stability when braking, longer braking distances
and different self-steering characteristics.
There is a danger of accidents. Drive with care
and do not exceed a speed of 80 km/h,
50 mph.
Label
The tyres are identified on the tyre's side wall by
RSC Runflat System Component.
Remedying flat tyres
Safety measures
▷ Park the vehicle on a firm surface and as far
away from moving traffic as possible.
▷ Switch on the hazard warning lights.
▷ Apply the parking brake to prevent the vehi‐
cle rolling away.
▷ Engage the steering wheel lock with the
wheels in the straight-ahead position.
▷ Have all vehicle occupants get out of the ve‐
hicle and guide them out of the danger area,
for example behind the crash barrier.
MOBILITY
273