Tire Terminology And Definitions - Chevrolet Silverado 1500 2021 Owner's Manual

(4) 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.
(5) Rim Diameter Diameter of the
:
wheel in inches.
(6) Service Description These
:
characters represent the load index and
speed rating of the tire. The load index
represents the load carrying capacity a
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
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 light truck (LT-Metric) 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
wheel in inches.
The
:
(6) Load Range
The 3-digit number
:
A 2-digit number that
:
A letter code is
:
Diameter of the
:
Load Range.
:
Vehicle Care
(7) Service Description The service
:
description indicates the load index and
speed rating of a tire. If two numbers
are given as in the example, 120/116,
then this represents the load index for
single versus dual wheel usage (single/
dual). The speed rating is the maximum
speed a tire is certified to carry a load.

Tire Terminology and Definitions

Air Pressure The amount of air inside
:
the tire pressing outward on each
square inch of the tire. Air pressure is
expressed in kPa (kilopascal) or psi
(pounds per square inch).
Accessory Weight The combined
:
weight of optional accessories. Some
examples of optional accessories are
automatic transmission, power
windows, power seats, and air
conditioning.
Aspect Ratio The relationship of a
:
tire's height to its width.
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