The Federal Government Uniform Tire Quality
Grading Standards are compiled of three characteristics of
different standards. Below we have defined these three characteristics.
TRACTION
The traction grades, from highest to lowest, are AA, A, B,
and C. These different grades are symbolic to how well the
tires can stop on wet pavement. This is tested on various
courses by the government. The Traction testing is performed
on a straight road. So this doesn't include any cornering
or other handling issues.
TREADWEAR
The treadwear grade is based on the rate in which the tire
wears down under controlled conditions on a government test
track. The treadwear can vary based on an individual's driving
style, climate, or road conditions.
TEMPERATURE
The temperature grades are rated as A, B, or C. A being the
highest and C being the lowest. These rates are compiled by
the tire being placed under extreme temperatures in controlled
environments. This temperature test is also something that
is done while the tire is standing still. The tire spinning
could cause the tire to fail a little quicker than in the
tests.
