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vehicle tire engineered to
standards set by the U.S. Tire
and Rim Association.
The three-digit
number indicates the tire section
width in millimeters from
sidewall to sidewall.
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.
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.
the wheel in inches.
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.
air inside the tire pressing
outward on each square inch
A letter
of the tire. Air pressure is
expressed in kPa (kilopascal)
or psi (pounds per square inch).
combined weight of optional
accessories. Some examples
of optional accessories are
Diameter of
automatic transmission, power
windows, power seats, and air
conditioning.
These
of a tire's height to its width.
cords between the plies and the
tread. Cords may be made from
steel or other reinforcing
materials.
steel wires wrapped by steel
cords that hold the tire onto
The amount of
the rim.
in which the plies are laid at
alternate angles less than
90 degrees to the centerline of
the tread.
The
The relationship
A rubber coated layer of
The tire bead contains
A pneumatic tire
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