Tire Terminology And Definitions - Chevrolet Equinox 2016 Manual

(1) Passenger (P-Metric) Tire
The United States version of a
metric tire sizing system. The
letter P as the first character in
the tire size means a passenger
vehicle tire engineered to
standards set by the U.S. Tire
and Rim Association.
(2) Tire Width The three-digit
:
number indicates the tire section
width in millimeters from
sidewall to sidewall.
(3) Aspect Ratio A two-digit
:
number that indicates the tire
height-to-width measurements.
For example, if the tire size
aspect ratio is 60, as shown in
item 3 of the illustration, it would
mean that the tire's sidewall is
60 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; and the letter B
means belted-bias ply
construction.
(5) Rim Diameter
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 The amount of
:
air inside the tire pressing
outward on each square inch of
A letter the tire. Air pressure is
:
expressed in kPa (kilopascal)
or psi (pounds per square inch).
Accessory Weight
combined weight of optional
accessories. Some examples of
optional accessories are
automatic transmission, power
windows, power seats, and air
Diameter of conditioning.
:
Aspect Ratio
These of a tire's height to its width.
:
Belt
cords between the plies and the
tread. Cords may be made from
steel or other reinforcing
materials.
Bead
steel wires wrapped by steel
cords that hold the tire onto
the rim.
Bias Ply Tire
in which the plies are laid at
alternate angles less than
90 degrees to the centerline of
the tread.
Vehicle Care
The
:
The relationship
:
A rubber coated layer of
:
The tire bead contains
:
A pneumatic tire
:
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