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277
uuChecking and Maintaining Tires uDOT Tire Quality Grading (U.S. Vehicles)
Continued
Maintenance
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.
Quality grades can be found where applicable on the tire sidewall between tread
shoulder and maximum section width.
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
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 characteristcs and climate.
■
Uniform Tire Quality Grading
■
Treadwear
1Uniform 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.
CIVIC 2D-31TS8600.book 277 ページ ２０１１年３月７日 月曜日 午後１時１０分
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