2023 Cadillac CT5 — Owner's Manual – Page #425

Posted on 27 Jul, 2022
Model: 2023 Cadillac CT5
Pages: 526
File size: 7 MB

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Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-16500419) -
2023 - CRC - 5/6/22
424 Vehicle Care
Passenger (P-Metric) Tire
(1) Passenger (P-Metric)
: 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
(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) 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
(5) Rim Diameter
Diameter of the wheel in
(6) Service Descripti on
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.
Tire Terminology and
Air Pressure : The amount
of air inside the tire
pressing outward on each
square inch of the tire. Air
pressure is expresse d
in kPa (kilopascal) or psi
(pounds per square inch).
Aspect Ratio
: The
relationship of a tire's
height to its width.
: 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.

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