Buick 2004 Rainier - Manual (Page 349)

(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 5-72.
(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 5-67 and Loading Your Vehicle on page 4-46.
LT-Metric Tire
5-61