Tire Designations - GMC Sierra 2014 Owner's Manual

10-58 Vehicle Care
(7) 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 Tire Pressure
on page 10-62 and Vehicle Load
Limits on page 9-15.

Tire Designations

Tire Size
The examples show a typical
passenger vehicle and light
truck tire size.
Passenger (P-Metric) Tire
(1) Passenger (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.
(2) Tire Width
:
number indicates the tire section
width in millimeters from
sidewall to sidewall.
(3) Aspect Ratio
number that indicates the tire
height-to-width measurements.
For example, if the tire size
aspect ratio is 75, as shown in
item C of the tire illustration, it
would mean that the tire's
sidewall is 75 percent as high
as it is wide.
(4) Construction Code
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.
(5) Rim Diameter
the wheel in inches.
(6) Service Description
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
:
(1) Light Truck (LT-Metric)
Tire
of a metric tire sizing system.
The letters LT as the first two
characters in the tire size mean
Diameter of
:
:
Light Truck (LT-Metric) Tire
The United States version
:
These