BRIDGESTONE
ASSIGNED UTQG GRADES
DOT QUALITY GRADES
 All
passenger car tires must conform to Federal Safety Requirements in
addition to these grades. |
| 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 a 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. |
TRACTION A, B, C
| The
traction grades from highest to lowest, are A, B, and C, and they
represent the tire’s ability to stop on wet pavement as measured
under controlled conditions on specified government test surfaces
of asphalt and concrete. A tire marked C may have poor traction performance.
|
TEMPERATURE A, B, C
| The
temperature grades are A (the highest), B, and C, representing the
tire’s resistance to the generation of heat and its ability to
dissipate heat when tested under controlled conditions on a specified
indoor laboratory test wheel. Sustained high temperature can cause
the material of the tire to degenerate and reduce tire life, and excessive
temperature can lead to sudden tire failure. The grade C corresponds
to a level of performance which all passenger car tires must meet
under the Federal Motor Vehicle Safety Standard No. 109. Grades A
and B represent higher levels of performance on the laboratory test
wheel than the minimum required by law.
|