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(F) Tire Ply Material: The type of cord and
number of plies in the sidewall and under
the tread.
(G) Single Tire Maximum Load: Maximum load
that can be carried and the maximum pressure
needed to support that load when used as a single.
For information on recommended tire pressure
see Inflation - Tire Pressure on page 402.
Tire Size
The following illustration shows an example of a
tire size.
(A) 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.
(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
60, as shown in item C of the illustration, it would
mean that the tire’s sidewall is 60 percent as
high as it is wide.
(D) Construction Code: A 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: Diameter of the wheel
in inches.
(F) Service Description: These characters
represent the load range and speed rating of the
tire. The load index represents the load carry
capacity a tire is certified to carry. The load index
can range from 1 to 279. The speed rating is
the maximum speed a tire is certified to carry a
load. Speed ratings range from A to Z.
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