Uniform Tire Quality Grading Standards (U.s. Vehicles) - Mercedes-Benz G 500 Operator's Manual

Operation
Tires and wheels
Uniform Tire Quality Grading Standards
(U.S. vehicles)
Tire manufacturers are required to grade
tires based on three performance
factors: treadwear, traction and
temperature resistance.
1 Treadwear
2 Traction
3 Temperature resistance
i For illustration purposes only. Actual data
on tires are specific to each vehicle and may vary
from data shown in above illustration.
302
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 rat-
ing based on the w ear rate of the tire when
tested under controlled conditions on a
specified government test course. For
example, a tire graded 150 would wear one
/ ) times as well on the
and one-half (1 1
2
government 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, service practices and differences in
road characteristics and climate.