Mazda MX-5 Bedienungshandbuch PDF herunterladen (Seite 417)

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Uniform Tire Quality Grading System (UTQGS)

This information relates to the tire grading system developed by the U.S. Nationa l

Highway Traffic Safety Administration for grading tires by tread wear, traction, and

temperature performance.

qTread 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.

qTraction-AA, A, B, C

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

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

specified government test surfaces of asphalt and con crete. 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.

qTemperature-A, B, C

The tem perature 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 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 correspon ds 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.

Customer Information and Reporting Safety Defects

Uniform Tire Quality Grading System (UTQGS)

9-21

MX-5_8CC1-EA-11F_Edition2 Page417

Monday, July 18 2011 10:9 AM

Form No.8CC1-EA-11F

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Mazda MX-5 Bedienungshandbuch Seite 417