Chevrolet 2010 Express Bedienungsanleitung PDF herunterladen (Seite 351)

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.

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