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Information
Race track mode:
−
If the actual pressure (e.g. due to cooling) drops
below 1.6 bar, a red warning is issued. The red
warning is canceled as soon as the actual pres-
sure exceeds 1.6 bar (e.g. due to heating).
−
If the warning threshold of the tire pressure
warning is also not reached, the warning is only
canceled when the tires are refilled to the re-
quired pressure again (pressure difference 0.0)
or a new target pressure is set in the Racetrack
menu.
e
Always check the tires for damage before fill-
ing to the required pressure (pressure difference
0.0).
Information
The tire pressure warning light only goes out when
the tire pressure has been corrected to the target
pressure.
The yellow tire pressure warning is displayed for ap-
prox. 10 seconds after the vehicle comes to a stand-
still or when the vehicle is switched on again.
The yellow tire pressure warning can be acknowl-
edged when the vehicle is switched on.
The red tire pressure warning also appears while driv-
ing and can be acknowledged.
g Refer to chapter "Warning and Information Mes-
sages" on page 121.
Uniform Tire Quality Grading
Fig. 191: "Treadwear", "Traction" and "Temperature" of the
tire
Quality grades can be found where applicable on the
tire sidewall between the tread shoulder and maxi-
mum tire width for example: All passenger vehicle
tires must also comply with the safety requirements
of the German Federal Government (Federal Safety
Requirements). Specification of quality classes, if ap-
plicable.
"Treadwear"
The treadwear grade is a comparative rating based on
the wear rate of the tire when tested under controlled
conditions on a specified government test course. For
example, a tire graded "150" would wear one and a
half (1 ½) times as well on the government course
as a tire graded "100". The relative performance of
tires depends upon the actual conditions of their use,
Roadside Assistance
however, and may depart significantly from the norm
due to variations in driving habits, service practices
and differences in road characteristics and climate.
"Traction" AA, A, B, C
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 control-
led conditions on specified government test surfaces
of asphalt and concrete. A tire marked C may have
poor traction performance.
Information
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 A, B, C
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 lab-
oratory 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 Safety Standard No. 109. Grades B
and A represent higher levels of performance on the
laboratory test wheel than the minimum required by
law.
223
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