Here are some tips for winter driving:
•Have your vehicle in good shape for winter.
•You may want to put winter emergency supplies in
Also seeTires on page 5-45.Include an ice scraper, a small brush or broom, a
supply of windshield washer ﬂuid, a rag, some winter
outer clothing, a small shovel, a ﬂashlight, a red
cloth, and a couple of reﬂective warning triangles. And,
if you will be driving under severe conditions, include
a small bag of sand, a piece of old carpet, or a couple of
burlap bags to help provide traction. Be sure you
properly secure these items in your vehicle.
If you add different sized wheels, your vehicle
may not provide an acceptable level of
performance and safety if tires not
recommended for those wheels are selected.
You may increase the chance that you will
crash and suffer serious injury. Only use GM
speci c wheel and tire systems developed for
your vehicle, and have them properly installed
by a GM certi ed technician.
SeeBuying New Tires on page 5-54andAccessories
and Modiﬁcations on page 5-3for additional information.
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
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.