Mazda MAZDA3 4-Door Manuel du propriétaire télécharger pdf (Page 533)

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101

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Customer Information and Reporting Safety Defects

Uniform Tire Quality Grading System (UTQGS)

This information relates to the tire grading system developed by the U.S. National Highway

Trafﬁ c Safety Administration for grading tires by tread wear, traction, and temperature

performance.

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 speciﬁ ed 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 signiﬁ cantly from the norm because of variations in driving habits, service

practices and differences in road characteristics and climate.

Traction-AA, A, B, C

The traction grades, from highest to lowest, are AA, A, B, and C. These grades represent the

tire's ability to stop on wet pavement as measured under controlled conditions on speciﬁ ed

government test surfaces of asphalt and concrete. A tire marked C may have poor traction

performance.

WARNING

The traction grade assigned to this tire is based on braking (straight ahead) traction tests

and does not include acceleration cornering (turning), hydroplaning, or peak traction

characteristics.

Temperature-A, B, C

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 speciﬁ ed indoor laboratory 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 Standard No. 109. Grades B and A represent higher

levels of performance on the laboratory test wheel than the minimum required by law.

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Mazda MAZDA3 4-Door Manuel du propriétaire Page 533

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