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EnglishOperation, care and maintenance -> Tire replacement for your BMW 7 Series 2001-2007
Tire replacement
137n
To maintain good handling and vehicle
response, use only tires of a single
tread configuration from a single manu-
facturer. BMW tests and approves
wheel/tire combinations. Refer to
page 142.
Traction
Temperature
The traction grades, from highest to
lowest, are AA, A, B, and C.
Those grades represent the tire's ability tire's resistance to the generation of
The temperature grades are A (the
highest), B and C, representing the
to stop on wet pavement as measured
under controlled conditions on speci-
fied government test surfaces of as-
phalt and concrete. A tire marked C
may have poor traction performance.
heat and its ability to dissipate heat
when tested under controlled condi-
tions on a specified indoor laboratory
test wheel.
DOT Quality Grades
Treadwear
Traction AA A B C
Temperature A B C
Sustained high temperature can cause
the material of the tire to degenerate
and reduce tire life, and excessive tem-
perature can lead to sudden tire failure.
The grade C corresponds to a level of
The traction grade assigned to
this tire is based on straight-
ahead braking traction tests, and does
All passenger car tires must con-
form to Federal Safety Require-
ments in addition to these grades.<
not include acceleration, cornering, hy- performance which all passenger car
droplaning, or peak traction character-
istics.<
tires must meet under the Federal Mo-
tor 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.
Treadwear
The treadwear grade is a comparative
rating based on the wear rate of the tire
when tested under controlled condi-
tions on a specified government test
course.
The temperature grade for this tire
is established for a tire that is
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.
properly inflated and not overloaded.
Excessive speed, underinflation, or ex-
cessive loading, either separately or in
combination, can cause heat buildup
and possible tire failure.<
Online Edition for Part No. 01 41 0 004 597 - © 08/99 BMW Group
138nTire replacement
Tire rotation
Uniform Tire Quality Grading
Tire age
Between the axles
Quality grades can be found where ap- The date on which the tire was manu-
The tread wear patterns at the front end
factured is indicated by the code on the differ from those at the rear – the actual
plicable on the tire sidewall between
tread shoulder and maximum section
width. For example:
sidewall: patterns will vary according to individ-
DOT ... 179 means that the tires were ual driving conditions. In the interests of
manufactured in the 17th week of 1999. safety and maintaining optimal handling
Treadwear 200 Traction AA
Temperature A
characteristics, tire rotation is not
recommended.
BMW recommends the replacement of
all tires when the tires are no more than
6 years old, even if a tire life of 10 years If a proposed interaxle rotation of tires
Do not use retreaded tires, since
driving safety may be impaired by is possible.
their use. This is due to the possible
is based on economic considerations,
one should consider whether the costs
for the rotation are likely to be recap-
tured by any increase in the service life
of the tires which might be realized. Ro-
tation should always be carried out at
short intervals, with a maximum of
3,000 miles (5,000 km). Consult your
BMW center for more information.
Spare tires over 6 years old should be
variations in casing structures and, in
some cases, to their extreme age, fac-
tors that can lead to a decrease in their
durability.<
used only in case of emergency. Such a
tire should be replaced by a new tire
immediately, and should not be
mounted together with new tires.
Online Edition for Part No. 01 41 0 004 597 - © 08/99 BMW Group
