Construction Code; Rim Diameter; Service Description; Aspect Ratio - Chevrolet Express Owner's Manual

of cord and number of plies in
the sidewall and under the tread.
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
and
.
The following examples
show the different parts of a
tire size.
The type
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.
number indicates the tire section
width in millimeters from
sidewall to sidewall.
number that indicates the tire
height-to-width measurements.
For example, if the tire size
aspect ratio is 75, as shown in
item 3 of the 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.
the wheel in inches.
The three-digit
characters represent the load
index and speed rating of the
tire. The load index represents
the load carrying capacity a tire
A two-digit
is certified to carry. The speed
rating is the maximum speed a
tire is certified to carry a load.
A letter
Diameter of
These