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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 6‑59
.
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‐w idth measurem ents.
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 index and speed rating of the
tire. The load index represents the load carry
capacity a tire is certified to carry. The speed
rating is the maximum speed a tire is certified to
carry a load.
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