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Buying New Tires
GM has developed and matched specific tires for
your vehicle. The original equipment tires installed
on your vehicle, when it was new, were designed
to meet General Motors Tire Performance Criteria
Specification (TPC Spec) system rating. If you
need replacement tires, GM strongly recommends
that you get tires with the same TPC Spec rating.
This way, your vehicle will continue to have tires
that are designed to give the same performance
and vehicle safety, during normal use, as the
original tires.
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 6‑54
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.
The optional 18‐inch performa nce tires, size
255/45ZR18 99Y, used on some vehicles, meets
the General Motors Tire Performa nce Criteria
Specification (TPC Spec) rating but the TPC Spec
code has not been molded onto the tire's sidewall.
If your vehicle has these tires, and you need to
replace them, you can still get these TPC Spec
rated tires by asking your GM dealer. Your GM
dealer can order these tires by part number. This
way, your vehicle will continue to give the proper
endurance, handling, traction, and ride as the
original tires.
Winter tires with the same speed rating as your
original equipment tires may not be available for
H, V, W, Y and ZR speed rated tires. If you choose
snow tires with a lower speed rating, never
exceed the tire's maximum speed capability.
6-70