Cadillac 2013 Caddilac CTS Owner's Manual page 363

Many General Motors high
performance models come
factory equipped with tires that
are optimized for maximum dry
and wet road performance while
still retaining satisfactory tread
life, excellent durability, and low
noise levels. In severe winter
climates where snowfall may be
significant, these tires may be
found to provide less traction.
This vehicle may come with high
performance summer tires. These
tires have a special tread and
compound that are optimized for
maximum dry and wet road
performance. This special tread
and compound will decrease
performance in cold climates, and
on ice and snow. We recommend
installing winter tires on the vehicle
if frequent driving in cold
temperatures or on snow or ice
covered roads is expected. See
Useful information about a tire is
molded into its sidewall. The
examples 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