Tire Terminology And Definitions - Chevrolet Bolt EUV 2022 Owner's Manual

(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 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 illustration, it would
mean that the tire's sidewall is
75 percent as high as it is wide.
(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.
The (6) Service Description
:
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.

Tire Terminology and Definitions

Air Pressure
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
weight of optional accessories. Some
examples of optional accessories are,
electric drive unit, power windows,
power seats, and air conditioning.
Aspect Ratio
tire's height to its width.
Belt A rubber coated layer of cords
:
that is located between the plies and
the tread. Cords may be made from
steel or other reinforcing materials.
These
:
The amount of air inside
:
The combined
:
The relationship of a
:
Vehicle Care
Bead The tire bead contains steel
:
wires wrapped by steel cords that hold
the tire onto the rim.
Bias Ply Tire A pneumatic tire in which
:
the plies are laid at alternate angles
less than 90 degrees to the centerline
of the tread.
Cold Tire Pressure The amount of air
:
pressure in a tire, measured in kPa
(kilopascal) or psi (pounds per square
inch) before a tire has built up heat
from driving. See Tire Pressure 0 265.
Curb Weight The weight of a motor
:
vehicle with standard and optional
equipment including the maximum
capacity of fuel, oil, and coolant, but
without passengers and cargo.
DOT Markings A code molded into the
:
sidewall of a tire signifying that the tire
is in compliance with the U.S.
Department of Transportation (DOT)
Motor Vehicle Safety Standards. The
DOT code includes the Tire Identification
Number (TIN), an alphanumeric
263