Tire Sidewall Labeling - GMC 2008 Envoy Denali Owner's Manual

Low-Profile Performance Tire
If your vehicle has P255/50R20 size tires, they are
classified as low-profile performance tires. These
tires are designed for very responsive driving on
wet or dry pavement. You may also notice more
road noise with low-profile performance tires and
that they tend to wear faster.
Notice: If your vehicle has low-profile tires,
they are more susceptible to damage from road
hazards or curb impact than standard profile
tires. Tire and/or wheel assembly damage can
occur when coming into contact with road
hazards like, potholes, or sharp edged objects,
or when sliding into a curb. Your vehicle
warranty does not cover this type of damage.
Keep tires set to the correct inflation pressure
and, when possible avoid contact with curbs,
potholes, and other road hazards.
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Tire Sidewall Labeling

Useful information about a tire is molded into the
sidewall. The following illustration is an example
of a typical P-Metric tire sidewall.
Passenger (P-Metric) Tire
(A) Tire Size The tire size code is a combination
:
of letters and numbers used to define a particular
tire's width, height, aspect ratio, construction type,
and service description. See the "Tire Size"
illustration later in this section for more detail.