GMC 2009 Sierra - Manual (Page 373)

(C) Dual Tire Maximum Load : Maximum load
that can be carried and the maximum pressure
needed to support that load when used in a dual
configuration. For information on recommended
tire pressure see Inflation - Tire Pressure on
page 5-65 and Loading Your Vehicle on page 4-34.
(D) 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.
(E) 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.
(F) Tire Ply Material : The type of cord and number
of plies in the sidewall and under the tread.
(G) Single Tire Maximum Load : Maximum load
that can be carried and the maximum pressure
needed to support that load when used as
a single. For information on recommended tire
pressure see Inflation - Tire Pressure on page 5-65
and Loading Your Vehicle on page 4-34.
Tire Size
The following examples show the different parts
of a tire size.
(A) Passenger (P-Metric) Tire : The United States
version of a metric tire sizing system. The letter P
as the first character in the tire size means a
passenger vehicle tire engineered to standards set
by the U.S. Tire and Rim Association.
Passenger (P-Metric) Tire
Light Truck (LT-Metric) Tire
5-61