TIRES AND WHEELS
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Temperature Grades Speed in Miles per Hour
A Over 115 MPH
B Between 100 and 115 MPH
C Between 85 and 100 MPH
The temperature grade is established for a tire that is properly inated and not
overloaded. Excessive speed, under ination, or excessive loading, either separately
or in combination, can cause heat buildup and possible tire failure.
WARNING
NOTE: NHTSA’s tire rating listings are
located online at https://www.safercar.gov/
Vehicle-Shoppers/Tires-Rating.
NHTSA also has more tire information
located online at https://www.safercar.gov/
tires/index.html.
Traction Grades Asphalt g-Force Concrete g-Force
AA Above 0.54 0.41
A Above 0.47 0.35
B Above 0.38 0.26
C Less Than 0.38 0.26
Temperature – A, B, and C
e 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 specied 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. e 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.
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