Mercedes-Benz 2009 CL-Class Operator's Manual page 449

Maximum permissible tire inflation
1
pressure
i For illustration purposes only. Actual data
on tires are specific to each vehicle and
may vary from data shown in above
illustration.
This is the maximum permissible tire inflation
pressure for the tire.
Always follow the recommended tire inflation
pressure ( Y page 435) for proper tire
inflation.
Uniform Tire Quality Grading
Standards
The Uniform Tire Quality Grading is a U.S.
Government requirement designed to give
drivers consistent and reliable information
regarding tire performance. Tire
manufacturers are required to grade tires
based on three performance factors:
treadwear, traction, and temperature
resistance. Although not a Government of
Canada requirement, all tires made for sale in
North America have these grades branded on
the sidewall.
Treadwear
1
Traction
2
Temperature resistance
3
Tires and wheels
i For illustration purposes only. Actual data
on tires are specific to each vehicle and
may vary from data shown in above
illustration.
Quality grades can be found, where
applicable, on the tire sidewall between tread
shoulder and maximum section width. For
example:
Treadwear Traction Temperature
200 AA A
All passenger car tires must conform to
federal safety requirements in addition to
these grades.
Treadwear
The treadwear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a specified
U.S. Government test course. For example, a
tire graded 150 would wear one and one-half
1
(1 / ) times as well on the government
2
course as a tire graded 100.
The relative performance of tires depends
upon the actual conditions of their use,
however, and may depart significantly from
the norm due to variations in driving habits,
Operation
Z
447