Subaru 2008 IMPREZA - Manual (Page 358)

13-2
Consumer information and Reporting safety defects
For U.S.A.
The following information has been
compiled according to Code of
Federal Regulations
“Title 49, Part
575
”.
Tire information
& Tire labeling
Many markings (e.g. Tire size, Tire
Identification Number or TIN) are
placed on the sidewall of a tire by
tire manufacturers. These markings
can provide you with useful infor-
mation on the tire.
! Tire size
Your vehicle comes equipped with
P-Metric tire size. It is important to
understand the sizing system in
selecting the proper tire for your
vehicles. Here is a brief review of
the tire sizing system with a break-
down of its individual elements.
! P Metric
With the P-Metric system, Section
Width is measured in millimeters.
To convert millimeters into inches,
divide by 25.4. The Aspect Ratio
(Section Height divided by Section
Width) helps provide more dimen-
sional information about the tire
size.
Example:
(1) P = Certain tire type used on
light duty vehicles such as passen-
ger cars
(2)
Section Width in millimeters
(3) Aspect Ratio (= section height
7 section width).
(4)
R = Radial Construction
(5) Rim diameter in inches
! Load and Speed Rating Descrip-
tions
The load and speed rating descrip-
tions will appear following the size
designation.
They provide two important facts
about the tire. First, the number
designation is its load index. Sec-
ond, the letter designation indicates
the tire
’s speed rating.