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GM’s exclusive TPC Spec system considers over a
dozen critical specifications that impact the overall
performance of your vehicle, including brake
system performance, ride and handling, traction
control, and tire pressure monitoring performance.
GM’s TPC Spec number is molded onto the tire’s
sidewall near the tire size. If the tires have an
all-season tread design, the TPC Spec number will
be followed by an MS for mud and snow. See Tire
Sidewall Labeling on page 6-49 for additional
information.
GM recommends replacing tires in sets of four.
This is because uniform tread depth on all tires will
help keep your vehicle performing most like it did
when the tires were new. Replacing less than a full
set of tires can affect the braking and handling
performance of your vehicle. See Tire Inspection
and Rotation on page 6-62 for information on
proper tire rotation.
{ WARNING:
Mixing tires could cause you to lose control
while driving. If you mix tires of different sizes,
brands, or types (radial and bias-belted tires),
WARNING: (Continued)
WARNING: (Continued)
the vehicle may not handle properly, and you
could have a crash. Using tires of different sizes,
brands, or types may also cause damage to your
vehicle. Be sure to use the correct size, brand,
and type of tires on all wheels. It is all right to
drive with your compact spare temporarily, as it
was developed for use on your vehicle. See
Compact Spare Tire on page 6-93.
{ WARNING:
If you use bias-ply tires on the 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 the vehicle.
If you must replace your vehicle’s tires with those
that do not have a TPC Spec number, make
sure they are the same size, load range, speed
rating, and construction type (radial and
bias-belted tires) as your vehicle’s original tires.
6-65