Buick 2007 LaCrosse Owner's Manual page 404

(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 421.
(G) Maximum Cold Inflation Load Limit:
Maximum load that can be carried and the
maximum pressure needed to support that load.
404
Compact Spare Tire Example
(A) Temporary Use Only: The compact spare
tire or temporary use tire has a tread life of
approximately 3,000 miles (5 000 km) and should
not be driven at speeds over 65 mph (105 km/h).
The compact spare tire is for emergency use
when a regular road tire has lost air and gone flat.
If your vehicle has a compact spare tire, see
Compact Spare Tire on page 437 and If a Tire
Goes Flat on page 425.