Pontiac Montana SV6 2007 Owner's Manual page 471

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 460 for additional information.
CAUTION:
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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), 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 496.
CAUTION:
{
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.
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.
Your vehicle's original equipment tires are listed
on the Tire and Loading Information Label.
This label is attached to the vehicle's center pillar
(B-pillar). See Loading Your Vehicle on page 389,
for more information about the Tire and Loading
Information Label and its location on your vehicle.
471