Further sidewall information includes the Uniform Tire Quality Grading system, which is overseen by the U.S government. The UTQG lists three factors:

Treadwear: The projected life of the tire. From a baseline 100, a larger number means the tire is expected to last longer than average; a smaller number means faster treadwear.

Traction: A (best), B, or C, and is based solely on the tire's wet-road straight-line stopping distance from 40 mph and is no reflection of its propulsion or cornering ability.

Temperature: A (best), B, or C, which rates to what degree the tire dissipates heat. Naturally, an A-graded tire can run hotter, but with proper loading, pressure, and operation, this grade is almost irrelevant.

Finally, the sidewall also gives construction (number of tread and body plies and their materials), and whether the tire is tube-type or tubeless. The stamped DOT serial number can be used for identification if a tire is recalled and to determine where and when the tire was made.


SPEED RATING CHART
Symbol Speed, mph
M 81
Q 99
S 112
T 118
U 124
H 130
V 149


LOAD INDEX
L.I.# Load, lb
81 1019
85 1135
91 1356
97 1609
103 1929
109 2271
116 2756
120 3086
123 3417