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Tire Size
The following illustration shows an example of a
typical passenger vehicle 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
indicates the tire height to width measurements.
For example, if the tire size aspect ratio is 70, as
shown in item C of the illustration, it would mean
that the tire's sidewall is 70 percent as high as it
is wide.
(D) Construction Code
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
inches.
(F) Service Description
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.
I n f o r ma t i o n P r o v i d e d b y :
A two digit number that
:
A letter code is used to
:
Diameter of the wheel in
:
These characters
:
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