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556
Tire Information
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 that 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.
Vehicle maximum load on the tire
.
Load on an individual tire that is
determined by distributing to each
axle its share of the maximum
loaded vehicle weight and dividing
by two.
Vehicle normal load on the tire
.
Load on an individual tire that is
determined by distributing to each
axle its share of the curb weight,
accessory weight, and normal oc-
cupant weight (distributed in accor-
dance with Table 1 that is appended
to the end of this section) and
dividing by 2.
Wheel-holding fixture
.
The fixture used to hold the wheel
and tire assembly securely during
testing.
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