10-66 Vehicle Care
Different Size Tires and
Wheels
If you add wheels or tires that are
a different size than the original
equipment wheels and tires, this
could affect the way the vehicle
performs, including its braking,
ride and handling characteristics,
stability, and resistance to rollover.
Additionally, if the vehicle has
electronic systems such as antilock
brakes, rollover airbags, traction
control, and electronic stability
control, the performance of these
systems can be affected.
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WARNING
If you add different sized wheels,
the 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 specific wheel and
tire systems developed for the
vehicle, and have them properly
installed by a GM certified
technician.
See Buying New Tires on
page 10‑64 and Accessories and
Modifications on page 10‑3 for
additional information.
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 Administr ation
(NHTSA), which grades tires
by treadwea r, 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
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