GMC 2012 Sierra - Manual (Page 438)

Black plate (52,1) GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
10-52 Vehicle Care
Tire Sidewall Labeling
Useful information about a tire
is molded into the sidewall.
The examples show a typical
passenger and light truck 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.
(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 Identification Number
(TIN)
: The letters and numbers
following the DOT code are
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.
(E) Tire Ply Material : The type
of cord and number of plies in
the sidewall and under the tread.
(F) Uniform Tire Quality
Grading (UTQG)
: Tire
manufacturers are required
to grade tires based on
three performance factors:
treadwear, traction, and
temperature resistance. For
more information, see Uniform
Tire Quality Grading on
page 10‑70.