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Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-13566829) -
2020 - CRC - 6/11/19
320 VEHICLE CARE
(1) Passenger (P-Metric) Tire :
The 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 three-digit
number indicates the tire section
width in millimeters from sidewall
to sidewall.
(3) 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 (3) of
the illustration, it would mean
that the tire's sidewall is
60 percent as high as it is wide.
(4) Constructio n 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 cert ified
to carry. The speed rating is the
maximum speed a tire is cer tified
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.
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) before a tire has
built up heat from driving. See
Tire Pressure 0 322.
Curb Weight
: The weight of a
motor vehicle with standard and
optional equipment including the
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