GMC Sierra 2023 Manual page 118

Passenger Tire/Spare Tire
(1) 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 in this section.
(2) 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.
(3) 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.
DOT Tire Date of Manufacture
four digits of the TIN indicate the tire
manufactured date. The first two digits
represent the week and the last two
digits, the year. For example, the third
week of the year 2020 would have a
4-digit DOT date of 0320. Week 01 is
the first full week (Sunday through
Saturday) of each year.
(4) 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.
(5) Tire Ply Material
and number of plies in the sidewall and
under the tread.
(6) Uniform Tire Quality Grading
(UTQG) Tire manufacturers are
:
required to grade tires based on three
The last performance factors: treadwear,
:
traction, and temperature resistance.
For more information, see Uniform Tire
Quality Grading 0 130.
(7) 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 0 121 and
:
Vehicle Load Limits 0 75.
(8) Temporary Use Only
temporary spare tire until the road tire
is repaired and replaced. This spare tire
should not be driven on over 112 km/h
(70 mph), or 88 km/h (55 mph) when
pulling a trailer, with the proper
inflation pressure. See your owner s
manual.
Vehicle Care 117
The type of cord
:
Only use a
: