Black plate (55,1)
GMC Sierra Owner Manual - 2011
Vehicle Care
10-55
(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 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
‑
74
.
(G) Maximum Cold Inflation
Load Limit
:
Maximum load
that can be carried and the
maximum pressure needed
to support that load. For
information on recommended
tire pressure see
Tire Pressure
on page 10
‑
61
and
Vehicle Load
Limits on page 9
‑
23
.
Light Truck (LT-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.
