Vehicle Care 10-49
Tire Sidewall Labeling
Useful information about a
tire is molded into its sidewall.
The examples below show a
typical passenge r vehicle tire
and a compact spare tire
sidewall.
Passenger (P‐Metric) Tire Example
(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” illustratio n 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.
(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.
(D) Tire Identificat ion Number
(TIN)
: The letters and numbers
following the DOT (Department
of Transportation) code is
the Tire Identification Number
(TIN). The TIN shows the
manufacturer and plant code,
tire size, and date the tire was
manufactured. The TIN is
molded onto both sides of the
tire, although only one side may
have the date of manufacture.
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