Cadillac XT4 2023 - Tire Terminology and Definitions

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
16412876) - 2023 - CRC - 3/25/22
370 Vehicle Care
(6) Service Description :
These characters
represent the load index
and speed rating of the
tire. The load index
represents the load
carrying capacity a tire is
certified to carry. The
speed rating is the
maximum speed a tire is
certified to carry a load.
Tire Terminology and
Definitions
Air Pressure : The amount
of air inside the tire
pressing outward on each
square inch of the tire. Air
pressure is expressed
in kPa (kilopascal) or psi
(pounds per square inch).
Aspect Ratio
: The
relationship of a tire's
height to its width.
Belt
: A rubber coated layer
of cords that is located
between the plies and the
tread. Cords may be made
from steel or other
reinforcing materials.
Bead
: The tire bead
contains steel wires
wrapped by steel cords
that hold the tire onto
the rim.
Bias Ply Tire
: A pneumatic
tire in which the plies are
laid at alternate angles less
than 90 degrees to the
centerline of the tread.
Cold Tire Pressure
: The
amount of air pressure in a
tire, measured in kPa
(kilopascal) or psi (pounds
per square inch) before a
tire has built up heat from
driving. See Tire Pressure
0 372.
DOT Markings
: A code
molded into the sidewall of
a tire signifying that the
tire is in complia nce with
the U.S. Department of
Transportation (DOT)
Motor Vehicle Safety
Standards. The DOT code
includes the Tire
Identification Number (TIN),
an alphanumer ic designator
which can also identify the
tire manufact urer,
production plant, brand,
and date of production.
GVWR
: Gross Vehicle
Weight Rating. See Vehicle
Load Limits 0 242.
GAWR FRT
: Gross Axle
Weight Rating for the front
axle. See Vehicle Load
Limits 0 242.
GAWR RR
: Gross Axle
Weight Rating for the rear
axle. See Vehicle Load
Limits 0 242.