548
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 sidewall.
. Snow tire
A tire that attains a traction index
equal to or greater than 110, compared
to the ASTM E-1136 Standard
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 circumferentially
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 capacity.
. 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 occupant
weight (distributed in accordance
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.