Chevrolet 2008 Impala Spezifikationen PDF herunterladen (Seite 319)

Uniform Tire Quality Grading

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

The following information relates to the system

developed by the United States National Highway

Traffic Safety Administration (NHTSA), 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 (UTQG)

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 (1.5) 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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