Tire Terminology And Definitions - Buick 2010 LaCrosse Owner's Manual

9-52 Vehicle Care
(C) Aspect Ratio A two digit
:
number that indicates the tire
height to width measurements.
For example, if the tire size
aspect ratio is 60, as shown in
item C of the illustration, it would
mean that the tire's sidewall is
60 percent as high as it is wide.
(D) Construction Code
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; and the
letter B means belted bias ply
construction.
(E) Rim Diameter Diameter of
:
the wheel in inches.
(F) Service Description
characters represent the load
index and speed rating of the
tire. The load index represents
the load carry capacity a tire is
certified to carry. The speed
rating is the maximum speed a
tire is certified to carry a load.
A
:
Tire Terminology and
Definitions
Air Pressure
air inside the tire pressing
outward on each square inch
of the tire. Air pressure is
expressed in psi (pounds per
square inch) or kPa (kilopascal).
These
:
The amount of
:
Accessory Weight
:
means 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 that is located between
the plies and the tread. Cords
may be made from steel or other
reinforcing materials.
This