Tire Designations - GMC CHEVROLET Silverado 1500 2021 Owner's Manual

364 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 0 367 and
Vehicle Load Limits 0 222.

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
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
indicates the tire section width in
millimeters from sidewall to sidewall.
(3) Aspect Ratio
indicates the tire height-to-width
measurements. For example, if the tire
size aspect ratio is 75, as shown in
item (3) of the tire illustration, it would
mean that the tire's sidewall is
75 percent as high as it is wide.
(4) Construction Code
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.
(5) Rim Diameter
The
:
wheel in inches.
(6) Service Description
characters represent the load index and
speed rating of the tire. The load index
represents the load carrying capacity a
The 3-digit number
:
A 2-digit number that
:
A letter code is
:
Diameter of the
:
These
:
tire is certified to carry. The speed
rating is the maximum speed a tire is
certified to carry a load.
Light Truck (LT-Metric) Tire
(1) Light Truck (LT-Metric) Tire
United States version of a metric tire
sizing system. The letters LT as the first
two characters in the tire size mean a
light truck tire engineered to standards
set by the U.S. Tire and Rim
Association.
(2) Tire Width The 3-digit number
:
indicates the tire section width in
millimeters from sidewall to sidewall.
(3) Aspect Ratio A 2-digit 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 light truck (LT-Metric) tire
The
: