Buick LaCrosse Owner's Manual page 305

Tire
manufacturers are required to
grade tires based on three
performance factors: treadwear,
traction, and temperature
resistance. For more information
see
Maximum load that
can be carried and the
maximum pressure needed to
support that load.
.
of cord and number of plies in
the sidewall and under the tread.
compact spare tire or temporary
use tire should not be driven at
speeds over 80 km/h (50 mph).
The compact spare tire is for
emergency use when a regular
road tire has lost air and gone
flat. If the vehicle has a compact
spare tire, see
The letters and numbers
following the DOT (Department
of Transportation) code are the
Tire Identification Number (TIN).
The TIN shows the
manufacturer and plant code,
tire size, and date the tire was
manufactured. The TIN is
molded onto both sides of the
The type
tire, although only one side may
have the date of manufacture.
The
can be carried and the
maximum pressure needed to
support that load.
temporary use tire or compact
spare tire should be inflated to
420 kPa (60 psi). For more
and
.
Maximum load that
The