Cadillac 2008 CTS - Manual (Page 344)

(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 5-80.
(G) Maximum Cold Inflation Load Limit :
Maximum load that can be carried and the
maximum pressure needed to support
that load.
(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 5-111 and If a Tire Goes Flat
on page 5-83.
Compact Spare Tire Example
5-62