GRECH MOTORS
38
Wheels and Tires
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.
Traction AA A B C
WARNING
The traction grade assigned to this tire is
based on straight-ahead braking traction
tests, and does not include acceleration,
cornering, hydroplaning or peak traction
characteristics
The traction grades, from highest to lowest are AA,
A, B, and C. The grades 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
WARNING
The temperature grade for this tire is
established for a tire that is properly
inflated and not overloaded. Excessive
speed, under-inflation, or excessive loading, either
separately or in combination, can cause heat buildup
and possible tire failure.
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. 139. Grades B and A represent
higher levels of performance on the laboratory test
wheel than the minimum required by law.
