110n
Tire replacementTo maintain good handling and vehicle
response, use only tires of a single
tread configuration from a single manu-
facturer. BMW tests wheel and tire
combinations and approves them.DOT Quality GradesTreadwear
Traction AA A B C
Temperature A B C
All passenger vehicle tires must
conform to Federal Safety
Requirements 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 (1g) 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.
Sustained high temperature can cause
the material of the tire to degenerate
and reduce tire life, and excessive
temperature can lead to a sudden flat
tire. The grade C corresponds to a level
of performance which all passenger
vehicle tires must meet under the
Federal Motor Vehicle Safety Standard
No. 109. Grades B and A represent
higher levels of performance on the
laboratory test wheel than the minimum
required by law.
The temperature grade for this tire
is established for a tire that is
properly inflated and not overloaded.
Excessive speed, under-inflation, or
excessive loading, either separately or
in combination, can cause heat buildup
and a possible flat tire.
applicable on the tire sidewall between
tread shoulder and maximum section
width. For example:
Treadwear 200 Traction AA
Temperature A
Everything from A to Z
151n
OverviewControlsMaintenanceRepairsDataIndex
Time of arrival,
estimated75
Timer70
Tire
condition109
damage109t
inflation
pressure22t, 109
labeling111
pressure monitor82
tread109
Tire Quality Grading110
Tools124t
Torque140
Tow fittings135t
Towing the vehicle135t
Track141
Traction Control System
refer to DSC80
Transmitter key26
Tread depth, tires109
Tread wear indicator109
Trip odometer63
Trunk, refer to luggage
compartment32
Turn signal indicator18, 59
bulb replacement125t
Turning circle141
U
Uniform Tire Quality Grading
(UTQR)110
Universal Transmitter93
Use antifreeze,
radiator118t
Used batteries132 V
Vehicle battery131
Vehicle key26
Vehicle Memory55
Ventilation91
Ventilation in the rear91
Ventilation while parked92
activating72
refer also to the "Onboard
Computer Owner's
Manual"
Ventilation, draft-free91 W
Warm feet Ð cool head91
Warning lamps16
Warning messages66
Warning triangle20
Warranty and Service Guide
Booklet (Canadian
models)119 Washer fluids115t
Washer reservoir,
filling115t
Washer system60
Washing your vehicle, refer
to the "Caring for your
vehicle" manual
Water on the roads107
Wear indicator in the
tires109
Weights142
Wheel and tire
combinations111
Wheelbase141
Width141
Windows36
convenience operation27
defrosting89
Windshield washer60
reservoir, filling115t
Windshield wiper60
Winter tires112
Wiper system60
Work in the engine
compartment113t
X
Xenon lamp125
