Chevrolet 2007 Optra Spezifikationen PDF herunterladen (Seite 320)

Uniform Tire Quality Grading

Quality grades can be found where applicable on

the tire sidewall between tread shoulder and

maximum selection width. For example:

Treadwear 200 Traction AA Temperature A

The following information relates to the system

developed by the Unites 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.

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

⁄

) 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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