Chevrolet 2011 Express 1500 Cargo Owner's Manual page 325

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.
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.
This does not apply to
Goodyear LT225/75R16
G949 RSA and Goodyear
LT225/75R16 G933 RSD
commercial truck tires.
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
and
.
The Department of
Transportation (DOT) code
indicates that the tire is in
compliance with the U.S.
Department of Transportation
Motor Vehicle Safety Standards.
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.