tire pressure BMW 330CI CONVERTIBLE 2004 E46 User Guide

129 Wheels and tires
Tire inflation pressureInformation for your safetyThe factory-approved tires are matched
to your vehicle and have been selected
to provide optimum safety and driving
comfort when used properly.
It is not merely the tire's service life, but
also driving comfort and – above all else
– driving safety that depend on the con-
dition of the tires and the maintenance
of the specified tire inflation pressure.
Incorrect tire inflation pressure is
a frequent cause of tire damage.
Tire pressure also has a major effect on
your BMW's handling response. Be
sure to check the tire inflation pressure,
including the space-saver spare tire or
the spare tire, on a regular basis, at
least twice a month and before every
extended journey, refer to page 25. If
this is not done, incorrect tire pressures
can cause driving instability and tire
damage, ultimately resulting in acci-
dents.<
Tire conditionTire tread – tire damageInspect your tires frequently for tread
wear, signs of damage and for foreign
objects lodged in the tread. Check the
tread depth.
Tread depth should not be allowed to
go below 1/8 in / 3 mm, even though
the legally specified minimum tread
depth is 1/16 in / 1.6 mm.
Below 1/8 in / 3 mm tread depth, there
is a great risk of hydroplaning, even at
relatively moderate speeds and with
only small amounts of water on the
road. Tread wear indicators in the
tread-groove base – see arrow – are
distributed around the wheel circumfer-
ence and are labeled on the tire side-
wall with TWI – Tread Wear Indicator. At
a tread depth of 1/16 in / 1.6 mm, the
indicators signal that the legally permis-
sible wear limit has been reached.
OverviewControlsMaintenanceRepairsDataIndex

130
Do not drive on a deflated – 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. Avoid
overloading the vehicle so that the per-
mitted load on the tires is not
exceeded. Overloading can lead to
overheating and internal tire damage.
The ultimate result can assume the
form of a sudden air loss.
Unusual vibrations encountered during
normal vehicle operation can indicate a
flat tire or some other vehicle malfunc-
tion. This type of problem can be
caused by contact with curbs, etc. This
is also true for irregularities in the vehi-
cle's handling characteristics, such as a
pronounced tendency to pull to the left
or right. Should this occur, respond by
immediately reducing your speed. Pro-
ceed carefully to the nearest BMW cen-
ter or professional tire center, or have
the vehicle towed in to have it, its
wheels or its tires inspected.
Tire damage up to and including sud-
den and complete air loss can endan-
ger the lives of both the vehicle occu-
pants and other road users.<
Tire replacementTo maintain good handling and vehicle
response, use only tires of a single
tread configuration from a single manu-
facturer.
Comply with the specified tire inflation
pressures — and be sure to have the
wheel and tire assembly balanced
every time you change a tire or wheel.DOT quality gradesTread wear
Traction AA A B C
Temperature A B C
All passenger car tires must con-
form to Federal Safety Require-
ments in addition to these grades. rating based on the wear rate of the tire
when tested under controlled condi-
tions on a specified government test
course.
For example, a tire graded 150 would
wear one and one-half – 1
1/2 – times as
well on the government course as a tire
graded 100. The relative performance
of tires depends upon the actual condi-
tions of their use, however, and may
depart significantly from the norm due
to variations in driving habits, service
practices and differences in road char-
acteristics and climate.TractionThe traction grades, from highest to
lowest, are AA, A, B and C.
Those grades represent the tire's ability
to stop on wet pavement as measured
under controlled conditions on speci-
fied government test surfaces of
asphalt and concrete. A tire marked C
may have poor traction performance.
The traction grade assigned to
this tire is based on straight-
ahead braking traction tests, and does
not include acceleration, cornering,
hydroplaning, or peak traction charac-
teristics. highest – B and C, representing the
tire's resistance to the generation of
heat and its ability to dissipate heat
when tested under controlled condi-
tions on a specified indoor laboratory
test wheel.
Tire condition

132
Wheel and tire combinationsThe right choice
BMW recommends using only
wheels and tires that have been
approved by BMW for your particular
vehicle model, as otherwise body con-
tact and serious accidents can result
despite the use of the same nominal
size, e.g. due to manufacturing toler-
ances. BMW cannot evaluate all tires
and wheels on the market, and is thus
unable to guarantee that the vehicle will
continue to perform safely if unap-
proved tires and/or wheels are
mounted.<
For each tire size, BMW has assessed
the safe performance of specific tire
brands and approved them for use.
Consult any BMW center for details.
Comply with any local/national regula-
tions, for example by recording the tire
type in the vehicle documents.
The correct wheel and tire combi-
nation affects various systems
that would otherwise be impaired, for
example ABS, DSC and DBC.
For this reason, use only tires of the
same manufacture and tread configura-
tion. In the event of a flat tire, for exam-
ple, remount the approved wheel and
tire combination as soon as possible.<
StorageAlways store tires in a cool, dry place.
Store them away from light whenever
possible. Protect the tires against con-
tact with oil, grease and fuel.
Do not exceed the maximum tire infla-
tion pressures specified on the tire
sidewall.
Winter tiresChoosing the right tireBMW recommends the use of winter
tires for operation under winter road
conditions. While all-season tires – with
M+S designation – provide better winter
traction than the corresponding sum-
mer tires, they generally do not achieve
the performance of winter tires.
In the interest of safe tracking and
steering response, install winter tires
made by the same manufacturer and
with the same tread configuration on all
four wheels.
Never exceed the maximum
speed for which the winter tires
are rated.
Unprofessional attempts by laymen to
service tires can lead to damage and
accidents.
Have this work performed by trained
professionals only. Any BMW center
has the required technical knowledge
and the proper equipment and will be
happy to assist you. your BMW is eqipped with Run Flat
tires. These are indicated by a circular
symbol containing the letters RSC on

133
the tire sidewall, refer to Changing a
wheel. In this case, use only Run Flat
winter tires, since no spare tire is pro-
vided in the event of a flat tire.Tire condition, tire pressureAt tread depths below approx. 3/16 in /
4 mm, winter tires display a perceptible
decrease in their ability to cope with
winter driving conditions, and should be
replaced in the interest of safety.
Comply with the specified tire inflation
pressures — and be sure to have the
wheel and tire assembly balanced
every time you change a tire or wheel.Snow chains*Only certain snow chains have been
tested by BMW and determined and
approved as roadworthy. Consult any
BMW center for details. BMW recom-
mends using only these approved fine-
link snow chains. Use them in pairs on
either summer or winter tires, but only
on both rear wheels.
Comply with all manufacturer's safety
precautions when mounting the chains.
Do not exceed a speed of 30 mph /
50 km/h when using snow chains.You cannot mount snow chains with the
following tires:
225/50 R 16
225/45 R 17
225/40 R 18
245/40 R 17
255/35 R 18
Do not initialize the Flat Tire Moni-
tor after mounting snow chains to
the tires.
When driving with snow chains, it may
be useful to turn off the DSC for a short
time, refer to page 94. OverviewControlsMaintenanceRepairsDataIndex

155
5. Position the jack at the jacking
point closest to the flat tire with the
jack base vertically below the jack-
ing point. The entire surface of the
head of the jack moves into the
square recess of the jacking point –
refer to the detail in the next illus-
tration – when the jack is cranked
6. Continue raising the vehicle up
until the wheel you are changing is
raised from the ground
7. Unscrew the lug bolts and remove
the wheel
8. Remove accumulations of mud and
dirt from the mounting surfaces of
the wheel and hub. Clean the lug
bolts
9. Position the new wheel or the
space-saver spare tire on the hub
and screw at least two lug bolts fin-
ger-tight into opposite bolt holes
10. Screw in the remaining lug bolts.
Screw in all the bolts in a diagonal
pattern
11. Lower the jack and remove it from
beneath the vehicle
12. Tighten the lug bolts securely in a
diagonal pattern
13. Wheels with full wheel covers*:
place the wheel cover with the
valve opening over the valve. Use
both hands to press the cover
securely onto the rim
14. Check and correct the tire inflation
pressure at the earliest opportunity.
Vehicles with Flat Tire Monitor:
After mounting the spare tire or
correcting the tire inflation pres-
sure, reinitialize the system, refer to
page 95.
Protect valve stems and valves from dirt
using screw-on valve stem caps. Dirty
valve stems frequently lead to slow
pressure loss.
Do not place the full wheel cover
on the space-saver spare tire,
since this could damage the cover.<
Changing a wheel
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156
The vehicle jack is designed for
changing wheels only. Do not
attempt to raise another vehicle model
with it or to raise any other type of load.
To do so could cause accidents and
personal injury.
To ensure continued safety, have the
tightness of the torque bolts checked
with a calibrated lug wrench – torque
specification: 88.5 lb ft/120 Nm – at the
earliest opportunity.<
When storing a wheel in the spare tire
recess, take care to avoid bending the
threaded rod.
If light-alloy wheels other than original
BMW light-alloy wheels have been
mounted, it may be necessary to use
different lug bolts for those wheels.
Replace the defective tire as soon as
possible and have the new wheel/tire
balanced.
Driving with the space-saver
spare tireDrive cautiously. Do not exceed a
speed of 45 mph / 80 km/h.
Be aware that vehicle handling may be
altered. Anticipate, e.g., reduced track-
ing during braking, longer braking dis-
tances and changed steering charac-
teristics when approaching limit
conditions. These handling characteris-
tics will be even more pronounced if
winter tires are mounted.
Only one space-saver spare tire
may be mounted at one time.
Mount a wheel and tire of the original
size at the earliest possible opportu-
nity.<
Run Flat tires*Run Flat tires are labeled on the side-
wall with a circular symbol containing
the letters RSC. Run Flat tires consist of
self-supporting tires and special rims.
The tire reinforcement ensures that
driving remains possible to a restricted
degree in the event of pressure drop or
even if the tire is deflated.
When mounting or replacing sum-
mer tires with winter tires, or vice
versa, use Run Flat tires since no spare
wheel is available in the event of a flat.
In this event, BMW recommends con-
sulting your BMW center. Your BMW
center has the information needed for
working with Run Flat tires and is
equipped with the necessary special
tools.<
Changing a wheel

157
Driving with a damaged tireDepending on the cargo load, Run Flat
tires allow you to continue driving at a
maximum speed of 50 mph / 80 km/h. If
there is a total loss of tire inflation pres-
sure, 0 psi/0 kPa, or obvious tire dam-
age, you can determine the distance
you may continue driving based on the
following values:
>With a light load:
1 to 2 persons without luggage:
approx. 150 miles/250 km
>With a medium load:
2 persons, luggage compartment full;
or 4 persons without luggage:
approx. 100 miles/150 km
>With a full load:
4 persons, luggage compartment full:
approx. 30 miles/50 km.
Drive cautiously. Do not exceed a
speed of 45 mph / 80 km/h. Be
aware that vehicle handling will be
altered when there is a loss in inflation
pressure. Anticipate, e.g., reduced
tracking during braking, longer braking
distances and changed steering char-
acteristics.
For safety reasons, BMW recommends
not having damaged Run Flat tires
repaired. In this case, consult your
BMW center.<
BatteryMaintenanceThe battery is maintenance-free, that is,
the original electrolyte will normally last
for the service life of the battery under
moderate climatic conditions.
Please consult your BMW center
whenever you have any questions
concerning the battery. cle, leave the engine off at all times.
Connect the charge cables to the termi-
nals in the engine compartment. For
terminal locations, refer to Jump-start-
ing on page 159.Disposal
Return used batteries to a recy-
cling point or your BMW center.
Maintain the battery in an upright posi-
tion for transport and storage. Secure
the battery against tilting during trans-
port.<
FusesYou will find the fuses and information
on their respective allocation in the
glove compartment behind a panel with
two snap clips.
Do not attempt to repair a blown
fuse or replace it with a fuse
having a different color or amperage
rating. To do this could cause a fire in
the vehicle resulting from a circuit over-
load.<
Run Flat tires*
OverviewControlsMaintenanceRepairsDataIndex

Everything from A to ZA
ABS Antilock Brake
System 125
indicator lamp 19
Acceleration assistant 78
Accessories, refer to For
your own safety 5
Accident, refer to Emer-
gency call 158
Activated-charcoal filter 110
Adaptive headlights 98
Adding brake fluid 141
Additional sources of infor-
mation 4
Air conditioning 102
Air conditioning mode 104
automatic climate
control 108
Air distribution
air conditioning 104
automatic climate
control 108
Air distribution,
individual 108
Air outlets, refer to Ventila-
tion 102, 106
Air pressure, refer to Tire
inflation pressure 25, 129
Air recirculation, refer to
Recirculated-air mode
104, 109Air supply
air conditioning 104
automatic climate
control 108
Air, drying, refer to Air con-
ditioning mode 104, 108
Airbags 61
deactivating 64
indicator lamp 18, 63
sitting safely 52
Airing out, refer to Ventila-
tion 102, 106
AKI, refer to Fuel specifica-
tions 25
Alarm system 38
avoiding unintentional
alarms 39
All-season tires, refer to
Winter tires 132
Antifreeze 140
coolant 140
washer fluid 138
Antilock Brake System
(ABS) 125
indicator lamp 19
Anti-theft system 30
Anti-theft warning system,
refer to Alarm system 38
Approved axle loads, refer
to Weights 168
Approved gross weight,
refer to Weights 168Armrest 114
Artificial leather, refer to the
Caring for your vehicle
brochure
Ashtray
front 115
rear 116
Assistant systems, refer to
Dynamic Stability Control
(DSC) 93
AUC Automatic recircu-
lated-air control 109
AUTO program, refer to
Automatic air
distribution 108
Automatic
air distribution 108
air supply 108
cruise control 84
headlamp control 97
Automatic car wash, refer to
the Caring for your vehicle
brochure
Automatic climate
control 106
Automatic curb monitor 58
Automatic dimming, interior
rearview mirror 60
Automatic recirculated-air
control (AUC) 109Automatic transmission with
Steptronic 79
indicator lamp 19, 81
interlock 71
selector lever lock 79
shiftlock 79
Automatic windshield
washer, refer to Rain sen-
sor 83
Average fuel
consumption 91
Average speed 91
Avoiding unintentional
alarms 39
Axle loads, refer to
Weights 168
B
Backrest
unlock 55
Backrest, refer to Seat
adjustment 53
Backup lamps 74
bulb replacement 151
Bandages, refer to First-aid
kit 23
Bar, towing 161

Everything from A to Z
177
I
Ice warning 90
Ignition 71
Ignition key 30
positions 71
Ignition lock 71
Imprint 4
Indicator lamps 18
Indicator/warning lamp
airbags 18
alarm system 39
brakes 18, 19
Check Gas Cap 19
coolant 19, 87
DSC 19
Fasten safety belts 18
Flat Tire Monitor
18, 19, 95
fog lamps 20
reserve 87
rollover protection
system 19
Service Engine Soon 19
Individual air distribution 108
Individual settings, refer to
Vehicle Memory, Key
Memory 70
Inflation pressure monitor-
ing, refer to Flat Tire Moni-
tor 94
Inflation pressure, tires
25, 129INSPECTION 88
Instrument cluster 16
Instrument lighting 98
Instrument panel 14
Integrated universal remote
control 112
Interface socket for onboard
diagnostics (OBD) 143
Interior lamps 100
remote control 32
Interior motion sensor 38
switching off 32, 39
Interior rearview mirror 60
automatic dimming
feature 60
Interior temperature, adjust-
ment 104, 108
Interlock, refer to Steering
wheel lock 71
Intermittent
mode, wipers 83
Interval
display, service 88
J
Jack 153
Jacking points 154
Jump-starting 159
K
Key Memory 70Keys 30
with remote control 30
Kickdown 76, 80
L
Lamp defect 149
Lamps and bulbs 149
Lashing down loads, refer to
Cargo loading 118
Lashing eyelets, refer to
Securing cargo 120
Lashing fittings, refer to
Securing cargo 120
LATCH child-restraint
mounting system 66
Leather care, refer to the
Caring for your vehicle
brochure
LEDs light-emitting
diodes 100
Length, refer to
Dimensions 167
License plate lamp
bulb replacement 153
Light switch 97
Light-emitting diodes
(LEDs) 100
Lighter 115
LIGHTS ON warning 97
Lights, refer to Parking
lamps/Low beams 97Load, refer to Cargo
loading 118
Loading
vehicle 118
Load-securing devices 120
Lock buttons on doors, refer
to Locking 34
Lock, steering wheel 71
Locking
from inside 34
from outside 31, 33
Locking and unlocking
doors
from inside 34
from outside 31, 33
Low beams 97
automatic 97
bulb replacement 149
indicator lamp, defective
lamp 88
Lug bolts
key 154
torque 154
OverviewControlsMaintenanceRepairsDataIndex

Everything from A to Z
179
Oil pressure
indicator lamp 18
OIL SERVICE 88
Oil types 139
Old batteries, refer to Dis-
posal 157
Onboard computer 90
Onboard computer, refer to
the Owner's Manual for
Onboard Computer
Onboard tool kit 148
Opening and closing
from outside 31
from the inside 34
via the door lock 33
via the remote control 31
Outlets, ventilation 102, 106
Outside temperature dis-
play 90
changing unit of
measure 90
P
Paintwork care, refer to the
Caring for your vehicle
brochure
Panic mode, trigger
alarm 32
Park Distance Control
(PDC) 92
Parking aid, refer to Park
Distance Control (PDC) 92Parking brake 73
indicator lamp 18
Parking lamps 97
bulb replacement 150
Parking lamps/Low
beams 97
Parts and accessories, refer
to Your individual vehicle 5
Passenger-side exterior mir-
ror tilt function 58
PDC Park Distance
Control 92
Plastic, refer to the Caring
for your vehicle brochure
Pollen, refer to
Microfilter 105
Pollen, refer to Microfil-
ter/activated-charcoal fil-
ter 110
Power output, refer to
Engine data 166
Power seat 53
Power socket, cigarette
lighter 116
Pressure monitoring, tires
Flat Tire Monitor 94
Pressure, tires 25, 129
Protective function
electric power windows 41R
Radio remote control key,
refer to Master key with
remote control 30
Radio, refer to the Owner's
Manual for Radio
Rain sensor 83
Raising the floor panel 37
Range 91
Reading lamps
front 100
rear 100
Rear lamps
bulb replacement 151
indicator lamp, defective
lamp 88
Rear window defroster
air conditioning 104
Rear window heating
automatic climate
control 109
Rear-entry assist 55
Rearview mirror 59
Receiving assistance 158
Recirculated-air mode
air conditioning 104
automatic climate
control 109
Recirculating the air, refer to
Recirculated-air mode
104, 109Reclining seat, refer to Seat
adjustment 53
Refueling 24
fuel filler door 24
Releasing
hood 134
Remaining distance to ser-
vice 88
Remaining distance, refer to
Range 91
Remote control 31
garage door opener 112
luggage compartment
lid 32
malfunction 32
Replacement key 31
Replacing lamps, refer to
Lamps and bulbs 149
Replacing tires 130
Reporting safety defects 7
Restraint systems
for children 64
Restraint systems, refer to
Safety belts 56
Reverse
automatic transmission
with Steptronic 79
SMG gearbox 76
Reverse gear
manual transmission 74
OverviewControlsMaintenanceRepairsDataIndex