Tire Terminology And Definitions - Chevrolet 2013 Express Owner's Manual

10-50 Vehicle Care
the maximum speed a tire is
certified to carry a load. This
does not apply to Goodyear
LT225/75R16 G949 RSA and
Goodyear LT225/75R16 G933
RSD commercial truck tires; see
the dual tire and single tire
maximum load and load range
letter designations on the tire
sidewall.
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
steering, power brakes, power
windows, power seats, and air
conditioning.
Aspect Ratio The relationship
:
of a tire's height to its width.
Belt A rubber coated layer of
:
cords between the plies and the
tread. Cords may be made from
steel or other reinforcing
materials.
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)
I n f o r ma t i o n P r o v i d e d b y :
before a tire has built up heat
from driving. See Tire Pressure
on page 10 53.
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
designator which can also
identify the tire manufacturer,
production plant, brand, and
date of production.
GVWR Gross Vehicle Weight
:
Rating. See Vehicle Load Limits
on page 9 10.