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540
Tire information
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.
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 pro-
tective bands.
Sidewall
.
That portion of a tire between the
tread and bead.
Sidewall separation
.
The parting of the rubber compound
from the cord material in the side-
wall.
Snow tire
.
A tire that attains a traction index
equal to or greater than 110, com-
pared to the ASTM E1136-93 Stan-
dard Reference Test Tire, when
using the snow traction test as
described in ASTM F-1805-00,
Standard Test Method for Single
Wheel Driving Traction in a Straight
Line on Snow-and Ice-Covered
Surfaces, and which is marked with
an Alpine Symbol " " on at least
one 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.
Tread rib
.
A tread section running circumfer-
entially around a tire.
Tread separation
.
Pulling away of the tread from the
tire carcass.
Treadwear indicators (TWI)
.
The projections within the principal
grooves designed to give a visual
indication of the degrees of wear of
the tread.
Vehicle capacity weight
.
The rated cargo and luggage load
plus 150 lbs (68 kg) times the
vehicle's designated seating capa-
city.
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