width BMW Z4 2.5I 2005 Owners Manual

Wheels and tires
80
Tire coding
Understanding the lettering on the tire sidewall
makes it easier to identify and choose the cor-
rect tires.
Tire size
e.g. 225/50 R 16 92 V
Nominal width in mm
Cross-sectional
ratio in %
Radial belt construction
Rim diameter in inches
Load index,
not on ZR tires
Speed code letter,
in front of the R on ZR tires
Speed code letter
Q= up to 105 mph / 160 km/h
T= up to 118 mph / 190 km/h
H= up to 131 mph / 210 km/h
V= up to 150 mph / 240 km/h
W= up to 167 mph / 270 km/h
Y= up to 186 mph / 300 km/h
Tire Identification Number
Tires with DOT codes meet the guidelines of
the U.S. Department of Transportation.
DOT code:
e.g. DOT xxxx xxx 5004
Manufacturer's code
for tire brand
Tire size and
tire version
Tire age
Tire age
The date on which the tire was manufactured is
indicated by the code on the sidewall:
DOT … 5004 indicates that the tire was manu-
factured in week 50 of the year 2004.BMW recommends the replacement of all tires
every 6 years at the latest, even if a tire usage of
10 years is possible.
Uniform Tire Quality Grading
Quality grades can be found where applicable
on the tire sidewall between tread shoulder and
maximum section width. For example:
Treadwear 200 Traction AA
Temperature A
DOT quality grades
Tread wear
Traction AA A B C
Temperature A B C
All passenger car tires must conform to
Federal Safety Requirements in addition
to these grades.<
Tread wear
The tread wear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a specified gov-
ernment test course.
For example, a tire graded 150 would wear one
and one-half, 1 γ, times as well on the govern-
ment course as a tire graded 100. The relative
performance of tires depends upon the actual
conditions of their use, however, and may
depart significantly from the norm due to varia-
tions in driving habits, service practices and dif-
ferences in road characteristics and climate.
Traction
The 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 specified government test sur-
faces 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, cor-
nering, hydroplaning, or peak traction charac-
teristics.<

Reference
At a glance
Controls
Driving tips
Mobility
115
Tire inflation pressure
– checking78
– restoring78
Tire pressure monitoring,
refer to Flat Tire Monitor52
Tires
– age80
– break-in procedures68
– changing82
– condition81
– damage81
– DOT quality grades80
– flat53
– inflation pressure78
– replacement82
– Run Flat tires82
– size78
– storage83
– temperature81
– traction80
– tread81
– tread wear80
– tread wear indicators, refer
to Tire tread, Wheel/tire
damage81
– Uniform Tire Quality
Grading80
– winter tires82
Tire storage83
Tool kit, refer to Onboard tool
kit91
Torque, refer to Engine
data102
Tow bar99
Towing98
– with sequential manual
gearbox SMG99
Towing eyelets98
Towing the vehicle98
– with automatic
transmission99
– with the front axle raised99
Tow rope99
Tow sockets for towing
eyelet98
Tow-starting98,99
Track width, refer to
Dimensions104Traction control, refer to
Dynamic Stability Control
DSC50
Transmission
– automatic transmission with
Steptronic38
– manual transmission38
– sequential manual gearbox
SMG40
Transmission detent, refer to
Range selection38
Transmission malfunction,
refer to Malfunction39
Transporting children
safely33
Transport securing device,
refer to Cargo loading71
Tread depth, refer to Tire
tread81
Tread wear indicators
in the tires, refer to
Tire tread, Wheel/tire
damage81
Trip distance recorder, refer to
Trip odometer46
Trip meter, refer to Trip
odometer46
Trip odometer46
Trunk
– refer to Luggage
compartment19
Trunk lid
– opening via remote
control17
– refer to Luggage
compartment lid18
Trunk lid, refer to Luggage
compartment lid18
Trunk volume, refer to
Luggage compartment
capacity103
Turning circle, refer to
Dimensions104
Turn signal indicators42
– indicator lamp13Turn signal indicators, bulb
replacement
– front93
– rear93
– side93
TV function, refer to Owner's
Manual for Onboard
Computer
U
Undercoating, refer to the
Caring for your vehicle
brochure
Units
– average
consumption48
– average
speed48
– temperature48
Unlocking
– from inside18
– from outside16
Used batteries, refer to
Battery disposal95
V
Vehicle
– battery94
– breaking in68
– care, refer to the Caring for
your vehicle brochure
– cargo loading70
– cleaning the rear window,
refer to the Caring for your
vehicle brochure
– engine37
– leaving the vehicle37
– measurements, refer to
Dimensions104
– parked70
– storage, refer to the Caring
for your vehicle brochure
– washing, refer to the Caring
for your vehicle brochure
– weight103
Vehicle battery94
Vehicle Memory31

Everything from A to Z
116 Ventilation59,63
– air conditioning59
– automatic climate control63
Vents, refer to
Ventilation59,63
Volume
– fuel tank, refer to
Capacities105
W
Warning and indicator
lamps12
Warning triangle96
Warranty, refer to Service and
Warranty Information
Booklet for US models,
Warranty and Service Guide
Booklet for Canadian
models89
Warranty and service7
Washer/wiper system43
Washer fluid reservoir, refer to
– Capacities105
– Headlamp washer system
and Windshield washer
system86
Washer jets, refer to
Windshield washer
nozzles44
Washing fluids86
Washing systems86
Waste tray, refer to Ashtray65
Water on roads, flooding69
Weights103
Wheel/tire combinations82
Wheelbase, refer to
Dimensions104
Wheels and tires78
Width, refer to
Dimensions104
Wind deflector24
Window defrosting, refer to
Defrosting windows
– air conditioning60
– automatic climate control62
Windows
– convenience operation18
Windshield washer nozzles44Windshield washer
reservoir86
– volume, refer to
Capacities105
Windshield washer system
– washer/wiper system43
– washing fluids86
Windshield wiper blades
– care, refer to the Caring for
your vehicle brochure
– changing91
Windshield wipers
– changing91
– refer to Washer/wiper
system43
Winter tires82
– changing94
– condition81
– storage83
Wood decoration, refer to the
Caring for your vehicle
brochure
Work in the engine
compartment84
Wrench, refer to Onboard tool
kit91
X
Xenon lamps, bulb
replacement92