Tire Terminology And Definitions - Cadillac Escalade 2022 Owner's Manual

404 VEHICLE CARE
vehicle tire engineered to
standards set by the U.S. Tire and
Rim Association.
(2) Tire Width The 3-digit
:
number indicates the tire section
width in millimeters from sidewall
to sidewall.
(3) Aspect Ratio A 2-digit
:
number that indicates the tire
height-to-width measurements.
For example, if the tire size aspect
ratio is 75, as shown in item (3) of
the illustration, it would mean
that the tire's sidewall is
75 percent as high as it is wide.
(4) Construction Code
code is used to indicate the type
of ply construction in the tire. The
letter "R" means radial ply
construction; the letter "D" means
diagonal or bias ply construction.
(5) Rim Diameter Diameter of
:
the wheel in inches.
(6) Service Description
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
inside the tire pressing outward
on each square inch of the tire.
Air pressure is expressed in kPa
(kilopascal) or psi (pounds per
A letter
:
square inch).
Accessory Weight
weight of optional accessories.
Some examples of optional
accessories are automatic
transmission, power windows,
power seats, and air conditioning.
Aspect Ratio
a tire's height to its width.
These
:
The amount of air
:
The combined
:
The relationship of
:
Belt A rubber coated layer of
:
cords 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 0 406.
Curb Weight The weight of a
:
motor vehicle with standard and
optional equipment including the
maximum capacity of fuel, oil, and
coolant, but without passengers
and cargo.