GRECH MOTORS
37
Wheels and Tires
WHEELS AND TIRES
TIRE CARE
Information About Uniform
Tire Quality Grading
Tire Quality Grades apply to new pneumatic
passenger car tires.
The Quality grades can be found where applicable
on the tire sidewall between tread shoulder and
maximum section width.
For example: Treadwear
200 Traction AA Temperature A.
These Tire Quality Grades are determined by
standards that the United States Department of
Transportation has set.
Tire Quality Grades apply to new pneumatic
passenger car tires. They do not apply to deep
tread, winter-type snow tires, space-saver or
temporary use spare tires, light truck or LT type tires,
tires with nominal rim diameters of 10 to 12 inches
or limited production tires as defined in Title 49 Code
of Federal Regulations Part 575.104 (c)(2).
U.S. Department of Transportation Tire quality
grades: The U.S. Department of Transportation
requires Grech Motors to give you the following
information about tire grades exactly as the
government has written it.
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 ½) times as well on the
government course as a tire graded 100. The
relative performance of tires depends upon the
