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For example, if the tire size
aspect ratio is 75, as shown in
item 3 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.
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.
Diameter of
the wheel in inches.
Load Range.
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. This
does not apply to Goodyear
LT225/75R16 G949 RSA and
Goodyear LT225/75R16 G933
A letter
RSD commercial truck tires; see
the dual tire and single tire
maximum load and load range
letter designations on the tire
sidewall.
air inside the tire pressing
outward on each square inch of
the tire. Air pressure is
The
expressed in kPa (kilopascal)
or psi (pounds per square inch).
combined weight of optional
accessories. Some examples of
optional accessories are
automatic transmission, power
steering, power brakes, power
windows, power seats, and air
conditioning.
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 rim.
The amount of
in which the plies are laid at
alternate angles less than
90 degrees to the centerline of
the tread.
The
amount of air pressure in a tire,
measured in kPa (kilopascal)
The relationship
A rubber coated layer of
The tire bead contains
A pneumatic tire
The
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