GMC Yukon Owner's Manual page 497

(E) Tire Ply Material
number of plies in the sidewall and under the
tread.
(F) Uniform Tire Quality Grading (UTQG)
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 82.
(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 Inflation - Tire Pressure on page 6 72 and
Loading the Vehicle on page 5 31.
The type of cord and
:
:
Tire
:
(A) Tire Size
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.
Light Truck (LT-Metric) Tire
The tire size code is a combination
:
6-65