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Tires
Vehicle care and maintenance 9-13
9
Sidewall: portion of a tire between the
tread and bead.
Section width: the linear distance between
the exteriors of the sidewalls of an
inflated tire, excluding elevations due to
labeling, decoration, or protective bands.
Bead: the part of the tire that is made of
steel wires, wrapped or reinforced by ply
cords and that is shaped to fit the rim.
Ply: a layer of rubber-coated parallel
cords.
Cord: the strands forming the plies in the
tire.
Rim: a metal support for a tire or a tire
and tube assembly upon which the tire
beads are seated.
Rim diameter: nominal diameter of the
bead seat.
Groove: the space between two adjacent
tread ribs.
EXAMPLE: P215/65R15
Tire Markings
1- Size Designation
2- Service Description
3- Maximum Load
4- Maximum Pressure
5- U.S. DOT Safety Standards Code
(TIN)
6- Treadwear, Traction and Temperature
Grades
Size Designation
P
Passenger car tire size based
on U.S.A. design standards
215
Section width in millimeters
(mm)
65
Aspect ratio in percent (%)
Ratio of section height to sec-
tion width of tire.
R
Construction code
•“R” means radial construc-
tion.
•“D” means diagonal or bias
construction.
15 Rim diameter in inches (in)
NOTE
European/Japanese metric tire
sizing is based on European/Jap-
anese design standards. Tires
designed to these standards have
the tire size molded into the
sidewall beginning with the sec-
tion width. The letter “P” is
absent from this tire size desig-
nation.
Example: 215/65R15 96H.
BK0277700US.book 13 ページ ２０１９年３月８日 金曜日 午前９時２３分
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