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Cadillac XT5 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
12146119) - 2019 - crc - 3/27/18
VEHICLE CARE 285
description. The letter T as the
first character in the tire size
means the tire is for temporar y
use only.
(7) TPC Spec (Tire Performance
Criteria Specification)
: Original
equipment tires designed to GM's
specific tire per formance criteria
have a TPC specification code
molded onto the sidewall. GM's
TPC specifications meet or exceed
all federal safety guidelines.
Tire Designations
Tire Size
The following is an example of a
typical passenger vehicle tire size.
(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) 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;
and the letter B means belted-bias
ply construction.
(5) Rim Diameter
: Diameter of
the wheel in inches.
(6) Service Descriptio n
: 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 carr y. The speed rating is the
maximum speed a tire is cer tified
to carr y 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
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