Subaru 2011 Impreza Owner's Manual page 428

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Passenger car tire
A tire intended for use on passen-
ger cars, multipurpose passenger
vehicles, and trucks, that have a
gross vehicle weight rating (GVWR)
of 10,000 lbs (4,535 kg) or less.
.
Ply
A layer of rubber-coated parallel
cords.
.
Ply separation
A parting of rubber compound
between adjacent plies.
.
Pneumatic tire
A mechanical device made of rub-
ber, chemicals, fabric and steel or
o t h e r m a t e r i a l s , t h a t , w h e n
mounted on an automotive wheel,
provides the traction and contains
the gas or fluid that sustains the
load.
.
Production options weight
The combined weight of those
installed regular production options
weighing over 5.1 lbs (2.3 kg) in
excess of those standard items
which they replace, not previously
considered in curb weight or acces-
sory weight, including heavy duty
brakes, ride levelers, roof rack,
heavy duty battery, and special
trim.
.
Radial ply tire
A pneumatic tire in which the ply
cords that extend to the beads are
laid at substantially 90 degrees to
the centerline of the tread.
.
Recommended inflation pres-
sure
The cold inflation pressure recom-
mended by a vehicle manufacturer.
.
Reinforced tire
A tire designed to operate at higher
loads and at higher inflation pres-
sures than the corresponding stan-
dard 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.
.
Rim size designation
Rim diameter and width.
Consumer information and Reporting safety defects
.
Rim type designation
The industry of manufacturer's des-
ignation for a rim by style or code.
.
Rim width
Nominal distance between rim
flanges.
.
Section width
The linear distance between the
exteriors of the sidewalls of an
inflated tire, excluding elevations
due to labeling, decoration, or
protective bands.
.
Sidewall
That portion of a tire between the
tread and bead.
.
Sidewall separation
The parting of the rubber com-
pound from the cord material in
the sidewall.
.
Test rim
The rim on which a tire is fitted for
testing, and it may be any rim listed
as appropriate for use with that tire.
.
Tread
That portion of a tire that comes
into contact with the road.
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