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530
YARIS iA_OM_OM99Q46z_(U)
7-6. Uniform Tire Quality Grading System (UTQGS)
The temperature grades A (the highest), B, and C, represent the tire’s
resistance to the generation of heat and its ability to dissipate heat
when tested under controlled conditions on a specified indoor labora-
tory test wheel.
Sustained high temperature can cause the material of the tire to
degenerate and reduce tire life, and excessive temperatures can lead
to sudden tire failure.
Grade C corresponds to a level of performance which all passenger
vehicle tires must meet under the Federal Motor Vehicle Safety Stan-
dard No. 109. Grades B and A represent higher levels of performance
on the laboratory test wheel than the minimum required by law.
These grades will be added to the sidewalls of passenger vehicle tires
over the next several years according to a schedule established by
the NHTSA and the tire manufacturers.
The grade of tires available as standard or optional equipment on Toy-
ota vehicles may vary with respect to grade.
ALL PASSENGER VEHICLE TIRES MUST CONFORM TO THESE
GRADES AND TO ALL OTHER FEDERAL TIRE-SAFETY REQUIRE-
MENTS.
Temperature-A, B, C
WARNING
■ Keep your vehicle’s tires properly inflated and not overloaded
Driving with improperly inflated or overloaded tires is dangerous. Exces-
sive speed, underinflation, or excessive loading, either separately or in
combination, can cause heat buildup and possible tire failure. The tem-
perature grade for this tire is established for a tire that is properly
inflated and not overloaded.
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