Saab 2007 9-3 User Manual download pdf (Page 245)

245Car care

Uniform Tire Quality Grading

Quality grades can be found where applica-

ble on the tire sidewall between tread shoul-

der and maximum section width. For exam-

ple:

Treadwear 200 Traction AA

Temperature A

The following information relates to the

system developed by the United States

National Highway Traffic Safety Administra-

tion, which grades tires by treadwear, trac-

tion and temperature performance. (This

applies only to vehicles sold in the United

States.) The grades are molded on the side-

walls of most passenger car tires. The Uni-

form 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-pro-

duction 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 Perfor-

mance Criteria (TPC) standards.

NOTICE

Wide wheels and tires with side walls that

are too low can:

• be damaged in potholes, etc.

• cause springs, shock absorbers and

wheel bearings and body mountings

to be overloaded.

• affect the function of the Electronic

Stability Program (ESP

®

).

The speed and load limits of the tires

must not be exceeded; see page 250.

Wheels larger than 17" must not be fitted

on the Saab 9-3 for reasons above. The

permissible offset is 1.61 inch (41 mm).

WARNING

Mixing tires could cause you to lose

control while driving. If you mix tires of

different sizes or types (radial and bias-

belted tires), the vehicle may not handle

properly, and you could have a crash.

Using tires of different sizes may also

cause damage to your vehicle. Be sure to

use the same size and type tires on all

wheels. It’s all right to drive with your

compact spare temporarily, it was devel-

oped for use on your vehicle. See

“Compact spare” on page 254.

WARNING

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.

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