Operation
Tires and wheels
Uniform Tire Quality Grading
Standards
i For illustration purposes only. Actual data service practices and differences in road
characteristics and climate.
on tires are specific to each vehicle and
may vary from data shown in above
illustration.
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.
Traction
Quality grades can be found, where
applicable, on the tire sidewall between tread
shoulder and maximum section width. For
example:
G Warning!
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.
Treadwear
Traction
Temperature
200
AA
A
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 performance.
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
G Warning!
If ice has formed on the road, tire traction
will be substantially reduced. Under such
weather conditions, drive, steer and brake
with extreme caution.
(1
1/2) times as well on the government
1
2
3
Treadwear
Traction
Temperature resistance
course as a tire graded 100.
The safe speed on a wet, snow covered or icy
road is always lower than on a dry road.
You should pay particular attention to the
condition of the road whenever the outside
temperature is close to the freezing point.
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,
272
| Categories | Mercedes-Benz Manuals, Mercedes-Benz R-Class Manuals |
|---|---|
| Tags | Mercedes Benz R350, Mercedes Benz R350 BlueTEC, Mercedes Benz V251 |
| Model Year | 2009 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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