Black plate (55,1)
Cadillac SRX Owner Manual- 2010

Vehicle Care 9-55

Tire Designations
Tire Size
The following illustration shows
an example of a typical
passenger vehicle tire size.
(A) Passenger (PMetric) 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.
(B) Tire Width:The threedigit
number indicates the tire section
width in millimeters from
sidewall to sidewall.
(C) Aspect Ratio:A twodigit
number that indicates the tire
heighttowidth 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: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 beltedbias ply
construction.
(E) Rim Diameter:Diameter of
the wheel in inches.
(F) 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 certified to carry.The speed
rating is the maximum speed a
tire is certified to carry a load.