Uniform tire quality grading

Uniform tire quality grading  - Technical and consumer information - Infiniti JX Owners Manual - Infiniti JX

DOT (Department of Transportation) Quality Grades: All passenger car tires must conform to federal safety requirements in addition to these grades.

Quality grades can be found where applicable on the tire sidewall between tread shoulder and maximum section width. For example:

Treadwear 200 Traction AA Temperature A

Treadwear

The treadwear 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 one-half (1 1/2) 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 due to variations in driving habits, service practices and differences in road characteristics and climate.

Traction AA, A, B and C

The traction grades, from highest to lowest, are AA, A, B, and C. Those grades represent the tires ability to stop on wet pavement as measured under controlled conditions on specified 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 straight-ahead braking traction tests, and does not include acceleration, cornering, hydroplaning, or peak traction characteristics.

Temperature A, B and C

The temperature grades are A (the highest), B, and C, representing the tires 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 temperature can lead to sudden tire failure.

The grade C corresponds to a level of performance which all passenger car tires must meet under the Federal Motor Safety Standard No.

109. Grades B and A represent higher levels of performance on the laboratory test wheel than the minimum required by law.

WARNING
The temperature grade for this tire is established for a tire that is properly inflated and not overloaded. Excessive speed, under-inflation, or excessive loading, either separately or in combination, can cause heat build-up and possible tire failure.

    See also:

    Installing front license plate
    Use the following steps to mount the license plate: Before mounting the license plate, confirm that the following parts are enclosed in the plastic bag. License plate bracket J-nut 6 2 Screw 6 2 ...

    Operating tips
    When the selector/shift lever is shifted to the R (Reverse) position, the monitor screen automatically changes to the rearview monitor mode. However, the radio can be heard. It may take some ti ...

    Interior light
    When the ON switch 1 is pressed, the footwell lights, step lights, map lights and rear personal lights will automatically turn on and stay on for a period of time when: ● The doors are unlock ...