Mazda MX-5 2024 Owner's Manual page 487

Uniform Tire Quality Grading System (UTQGS)
Uniform Tire Quality
Grading System (UTQGS)
This information relates to the tire
grading system developed by the U.S.
National Highway Traffic Safety
Administration for grading tires by
tread wear, traction, and temperature
performance.
MX-5_8ME4-EA-23L_Edition1_new
Specifications/Customer Information and Reporting Safety Defects
Tread Wear
The tread wear 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 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 because of
variations in driving habits, service
practices and differences in road
characteristics and climate.
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