Mercedes-Benz SL 550 BlueEFFICIENCY, Operator'S Manual

Page: 543 / 572

on surfaces that are not icy or covered with
snow. Take appropriate care when driving.
Further information on winter tires (M+S
tires) (
Y
page 528).
Temperature
G
WARNING
The temperature grade for this tire is
established for a tire that is properly inflated
and not overloaded. Excessive speed,
underinflation, or excessive loading, either
separately or in combination, can cause
excessive heat build-up and possible tire
failure.
The temperature grades are A (the highest),
B, and C. These represent 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 B and A
represent higher levels of performance on the
laboratory test wheel than the minimum
required by law.
Tire labeling
Overview
:
Uniform Tire Quality Grading Standard
(
Y
page 545)
;
DOT, Tire Identification Number
(
Y
page 544)
=
Maximum tire load (
Y
page 544)
?
Maximum tire pressure (
Y
page 532)
A
Manufacturer
B
Tire material (
Y
page 545)
C
Tire size designation, load-bearing
capacity and speed index (
Y
page 541)
D
Load index (
Y
page 544)
E
Tire name
The markings described above are on the tire
in addition to the tire name (sales
designation) and the manufacturer's name.
i Tire data is vehicle-specific and may
deviate from the data in the example.
Tire size designation, load-bearing
capacity and speed rating
G
WARNING
Exceeding the stated tire load-bearing
capacity and the approved maximum speed
could lead to tire damage or the tire bursting.
There is a risk of accident.
All about wheels and tires
541
Wheels and tires
Z