Buick 2010 Lacrosse Owner's Manual page 332

See your dealer/retailer for details
regarding winter tire availability and
proper tire selection. Also, see
If you choose to use winter tires:
Use tires of the same brand and
tread type on all four wheel
positions.
Use only radial ply tires of the
same size, load range, and
speed rating as the original
equipment tires.
Winter tires with the same speed
rating as your original equipment
tires may not be available for H, V,
W, Y, and ZR speed rated tires.
If you choose winter tires with a
lower speed rating, never exceed
the tire's maximum speed capability.
Useful information about a tire is
molded into its sidewall. The
.
examples below show a typical
passenger vehicle tire and a
compact spare tire sidewall.
combination of letters and
numbers used to define a
particular tire's width, height,
aspect ratio, construction type,
The tire size is a
and service description. See the
Tire Size illustration later in this
section for more detail.
Original
equipment tires designed to
GM's specific tire performance
criteria have a TPC specification
code molded onto the sidewall.
GM's TPC specifications meet
or exceed all federal safety
guidelines.
The
Department of Transportation
(DOT) code indicates that
the tire is in compliance
with the U.S. Department of
Transportation Motor Vehicle
Safety Standards.