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Tires
Vehicle care and maintenance 9-11
9
Intended outboard sidewall:
• The sidewall that contains a whitewall,
bears white lettering or bears manufac-
turer, brand, and/or model name molding
that is higher or deeper than the same
molding on the other sidewall of the tire,
or
• The outward facing sidewall of an asym-
metrical tire that has a particular side
that must always face outward when
mounted on a vehicle.
Passenger car tire: a tire intended for use
on passenger cars, multipurpose passen-
ger vehicles, and trucks, that have a gross
vehicle weight rating (GVWR) of 10,000
pounds or less.
Light truck (LT) tire: a tire designated by
its manufacturer as primarily intended for
use on lightweight trucks or multipurpose
passenger vehicles.
Tread: portion of a tire that comes into
contact with the road.
Tread rib: a tread section running circum-
ferentially around a tire.
Tread separation: pulling away of the
tread from the tire carcass.
Carcass: the tire structure, except tread
and sidewall rubber which, when inflated,
bears the load.
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
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
section width of tire.
R
Construction code
•“R” means radial construc-
tion.
• “D” means diagonal or
bias construction.
15 Rim diameter in inches (in)
BK0220401US.book 11 ページ ２０１５年６月３日 水曜日 午前７時４２分
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