Chevrolet 1999 Prizm Bedienungshandbuch PDF herunterladen (Seite 259)

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CAUTION:

If you use bias-ply tires on your vehicle, the

wheel rim flanges could develop cracks after

many miles of driving. A tire and/or wheel could

fail suddenly, causing a crash. Use only radial

-ply

tires with the wheels on your vehicle.

Uniform Tire Quality Grading

The following information relates to the system developed

by the United States National Highway Traffic Safety

Administration, which grades tires by treadwear, traction

and temperature performance. (This applies only to

vehicles sold in the United States.) The grades are molded

on the sidewalls of most passenger car tires. The Uniform

Tire Quality Grading system does not apply to deep tread,

winter

-type snow tires, space-saver or temporary use spare

tires, tires with nominal rim diameters of 10 to 12 inches

(25 to 30 cm), or to some limited

-production tires.

While the tires available on General Motors passenger

cars and light trucks may vary with respect to these

grades, they must also conform to Federal safety

requirements and additional General Motors Tire

Performance Criteria (TPC) standards.

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 a 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, C

The traction grades, from highest to lowest, are AA, A,

B, and C. Those 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 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.

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