2004 BMW Z4 ROADSTER 3.0I wheel size

Adjustments
30
Safety function
1.Close the driver's door and turn the
ignition key to position 0 or 2
2.Press and hold the desired memory
button 1, 2 or 3 until the adjustment
process is completed.
If you press the
MEMORY button acciden-
tally:
Press the button again; the indicator lamp
goes out.
Seat heating*
The seat cushion and backrest can be
heated with the ignition key in position 2.
You can call up different heating modes by
repeatedly pressing the buttons.
The seat heating can also be switched off
from the higher heating modes:
Press the button and hold it slightly longer.
Safety belts
To close
Make sure you hear the lock engage in the
belt buckle.The warning lamp in the instrument
cluster lights up for a few seconds
or until the safety belts have been
fastened. Depending on the vehicle ver-
sion, an acoustic signal
* sounds at the
same time.
To unlock the safety belt
1.Press the red button in the belt buckle
2.Hold the belt
3.Guide the belt back into its reel.
The upper belt attachment point is suitable
for all body sizes provided that the person
is sitting correctly, refer to page 28.
Damaged safety belts
If the safety belts are damaged or
stretched in an accident: have the
entire belt system, including the tensioning
mechanisms, replaced at your BMW cen-
ter. Have the belt anchorage points
inspected for damage at the same time.
Failure to observe this precaution may pre-
vent the safety belts from effectively pro-
viding optimal protection when needed.<
Steering wheel
Adjustments
Never attempt to adjust the steering
wheel while driving the vehicle. It
could respond with unexpected move-
ment, posing a potential accident hazard.<
1.Push the locking lever downward
2.Adjust the steering column's reach and
height to suit your seat position
3.Pull the lever back in.

Reference
At a glance
Controls
Driving tips
Mobility
75
Wheels and tires
Tire inflation pressure
Information for your safety
It is not merely the tire's service life, but
also driving comfort and driving safety that
largely depend on the condition of the tires
and the maintenance of the specified tire
pressure.
Check tire inflation pressures regu-
larly and correct them if necessary: at
least every two weeks and before every
extended journey. If this is not done, incor-
rect tire pressures can cause driving insta-
bility or tire damage, ultimately resulting in
accidents.
Do not drive with a deflated, i.e. flat, tire
unless your vehicle is equipped with Run
Flat tires. A flat tire greatly impairs steering
and braking response, and can lead to
complete loss of control over the vehicle.<
Checking tire pressures
Check the tire inflation pressures only
when the tires are cold. This means after a
maximum driving distance of 1.25 miles/
2 km or if the vehicle has been parked for at
least 2 hours. Warm tires have higher infla-
tion pressures.
Reinitialize the Flat Tire Monitor after cor-
recting the tire inflation pressure. Refer to
page 55.
Inflation pressures for original tires
The specified inflation pressures for tires at
ambient temperature are provided on the
placard on the B-pillar and are visible when
the driver's door is open.
Inflation pressures for other tire
sizes
The following tire inflation pressure tables
show the inflation pressures for the speci-
fied tire sizes at ambient temperature.
Reinitialize the Flat Tire Monitor after
correcting the tire inflation pressure.
Refer to page 55.<
Tire size
The inflation pressures in the table apply to
BMW-approved tire sizes and brands. Your
BMW center will be glad to supply this
information.

Reference
At a glance
Controls
Driving tips
Mobility
79
Wheel and tire replacement
Unprofessional attempts by laymen to
service tires can lead to damage and
accidents.
Have this work performed by skilled pro-
fessionals only. Any BMW center has the
required technical knowledge and the
proper equipment and will be happy to
assist you.<
The correct wheel and tire combination
also affects various systems that would
otherwise be impaired, for example ABS or
DSC.
Have the wheels balanced after each tire or
wheel replacement.
BMW advises against using retreaded
tires, since driving safety may be
impaired. This is due to possible variations
in casing structures and, in some cases, to
their extreme age, factors which can lead
to a decrease in their durability.<
The correct wheels and tires
BMW recommends using only wheels
and tires that have been tested and
approved by BMW for your particular vehi-
cle model, as otherwise body contact and
serious accidents can result despite the
use of the same nominal size, e.g. due to
manufacturing tolerances. If non-approved
wheels and tires are used, BMW cannot
evaluate their suitability, and therefore can-
not be held liable for driving safety.<
To maintain good handling and vehicle
response, use only tires of a single brand
and tread configuration. In the event of a
flat tire, remount the previous wheel and
tire combination as soon as possible.
Recommended tire sizes and brands
BMW tests certain tire brands for each tire
size, classifies them as road-safe and
approves them. You can best find out
about these at a specialized shop, particu-
larly your BMW center. Observe any coun-
try-specific regulations, e.g. on making a
corresponding entry in the vehicle docu-
ments.The factory-approved radial-ply tires are
matched to your vehicle and have been
selected to provide optimum safety and
driving comfort when used properly.
Run Flat tires fitted
Use only Run Flat tires, since no spare
wheel is available in the event of a flat.
Special characteristics of winter
tires
BMW recommends the use of winter tires
for operation under winter road conditions.
While all-season tires, with M+S designa-
tion, provide better winter traction than
summer tires, they generally do not achieve
the full performance of winter tires.
For mounting winter tires, refer to the
descriptions under Tire condition and
Wheel and tire replacement, pages 78, 79.
Run Flat tires fitted
Use only winter Run Flat tires, since no
spare wheel is available in the event of a
flat.
Observing speed ratings
Never exceed the maximum speed for
which the winter tires are rated.
Unprofessional attempts by laymen to ser-
vice tires can lead to damage and acci-
dents. Have this work performed by skilled
professionals only. The technicans at your
BMW center will be glad to assist you with
the required professional knowledge and
specialized equipment.<
Storage
Store tires in a cool, dry place, protecting
them against light whenever possible. Pro-
tect the tires from contact with oil, grease
and fuel. Do not exceed the maximum tire
inflation pressures specified on the tire
sidewall.