BMW X7 2023 Owner's Manual page 343

practices and differences in road characteris-
tics 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 surfaces of asphalt and concrete. A tire
marked C may have poor traction perform-
ance.
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 characteristics.
Temperature
The temperature grades are A, the highest, B,
and C, representing the tire's resistance to the
generation of heat and its ability to dissipate
heat when tested under controlled conditions
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
sudden tire failure. The grade C corresponds
to a level of performance which all passenger
car tires must meet under the Federal Motor
Vehicle Safety Standard No. 109. Grades Band
A represent higher levels of performance on
the laboratory test wheel than the minimum
required by law.
Warning
The temperature grade for this tire is estab-
lished for a tire that is properly inflated and
not overloaded. Excessive speed, underinfla-
tion, or excessive loading, either separately
or in combination, can cause heat buildup
and possible tire failure.
Online Edition for Part no. 01405A7B198 - II/23
Wheels and tires
Runflat tires
Runflat tires, refer to page 347, are labeled
with a circular icon containing the letters RSC
marked on the tire sidewall.
M+S
Winter tires, as well as all-season tires with
better winter performance than summer tires,
can be identified by the M+S marking on the
tire side wall.
Tire tread
Summer tires
Do not drive with a tire tread depth of less than
0.12 in/3 mm, otherwise there is an increased
risk of aquaplaning.
Winter tires
Do not drive with a tire tread depth of less than
0.16 in/4 mm, as such tires are less suitable for
winter driving conditions.
All-season tires
Do not drive with a tire tread depth of less than
0.16 in/4 mm, as such tires are less suitable for
winter driving conditions.
Minimum tread depth
Distributed over the tire circumference are
the tire manufacturer's wear indicators with a
MOBILITY
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