Tire Terminology And Definitions - GMC 2012 Sierra Denali Owner's Manual

10-52 Vehicle Care
(B) Tire Width The three digit
:
number indicates the tire section
width in millimeters from
sidewall to sidewall.
(C) Aspect Ratio A two digit
:
number that indicates the tire
height to width measurements.
For example, if the tire size
aspect ratio is 75, as shown in
item C of the light truck
(LT Metric) tire illustration, it
would mean that the tire's
sidewall is 75 percent as high
as it is wide.
(D) Construction Code
letter 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.
(E) Rim Diameter
the wheel in inches.
(F) Load Range
(G) Service Description
service description indicates the
load index and speed rating of a
tire. If two numbers are given as
in the example, 120/116, then
this represents the load index for
single versus dual wheel usage
(single/dual). The speed rating is
the maximum speed a tire is
certified to carry a load.
Tire Terminology and
A
:
Definitions
Air Pressure
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).
Diameter of
:
Load Range.
:
The
:
The amount of
:
Accessory Weight
:
combined weight of optional
accessories. Some examples of
optional accessories are
automatic transmission, power
steering, power brakes, power
windows, power seats, and air
conditioning.
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.
The