Tire Sidewall Labeling
Useful information about a tire is molded into its
sidewall. The examples below show a typical
passenger vehicle tire and a compact spare tire
sidewall.
(A) Tire Size: The tire size 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.
(B) TPC Spec (Tire Performance Criteria
Specification): Original equipment tires designed
to GM’s specific tire performance criteria have a
TPC specification code molded onto the sidewall.
GM’s TPC specifications meet or exceed all federal
safety guidelines. If your vehicle has 205/55R16
size tires, they meet the GM TPC Spec rating, but
the TPC Spec code has not been molded onto the
tire’s sidewall.
(C) DOT (Department of Transportation): The
Department of Transportation (DOT) code indicates
that the tire is in compliance with the U.S.
Department of Transportation Motor Vehicle Safety
Standards.
Passenger (P-Metric) Tire Example
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