Department Of Transportation Uniform Tire Quality Grades; Treadwear - Jeep Grand Cherokee 2013 Owner's Manual

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DEPARTMENT OF TRANSPORTATION UNIFORM
TIRE QUALITY GRADES
The following tire grading categories were established by
the National Highway Traffic Safety Administration. The
specific grade rating assigned by the tire's manufacturer
in each category is shown on the sidewall of the tires on
your vehicle.
IF YOU NEED CONSUMER ASSISTANCE 699
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 government test course. For
example, a tire graded 150 would wear one and one-half
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, however, and
may depart significantly from the norm due to variations
in driving habits, service practices, and differences in
road characteristics and climate.
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