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(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 descripti on. See the “Tire Size”
illustration later in this section for more detail.
(B) TPC Spec (Tire Performanc e 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 DOT (Department of
Transportation ) code is the Tire Identification
Number (TIN). The TIN shows the manufact urer
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 6‑68
.
(G) Maximum Cold Inflation Load Limit
:
Maximum load that can be carried and the
maximum pressure needed to support that load.
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