HONDA 2011 CR-Z - Manual (Page 273)

272
Maintenance
Checking and Maintaining Tires DOT Tire Quality Grading (U.S. Vehicles)
DOT Tire Quality Grading (U.S. Vehicles)
The tires on your vehicle meet all U.S. Federal Safety Requirements. All
tires are also graded for treadwear, traction, and temperature performance
according to Department of Transportation (DOT) standards. The following
explains these gradings.
Uniform Tire Quality Grading ■
Quality grades can be found where applicable on the tire sidewall between
tread shoulder and maximum section width.
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
(1 1/2) 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.
Uniform Tire Quality Grading
For example:
Treadwear 200
Traction AA
Temperature A
All passenger car tires must conform to
Federal Safety Requirements in addition
to these grades.
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2011 CR-Z