Chevrolet 2004 Impala Owner's Manual page 322

(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 5-71.
(G) Maximum Cold Inflation Load Limit: Maximum
load that can be carried and the maximum pressure
needed to support that load. For more information on
recommended tire pressure see Inflation - Tire Pressure
on page 5-65 and Loading Your Vehicle on page 4-32.
Compact Spare Tire Example
5-60