Traction Grades; Temperature Grades - Jeep Grand Cherokee 2016 Owner's Manual

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736 IF YOU NEED CONSUMER ASSISTANCE

significantly from the norm due to variations in driving

habits, service practices, and differences in road charac-

teristics and climate.

Traction Grades

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 specified government test surfaces of asphalt and

concrete. A tire marked C may have poor traction perfor-

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.

The temperature grades are A (the highest), B, and C,

representing 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 temperature can lead to sudden tire failure. The

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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