13-8
Consumer information and Reporting safety defects
. Rim type designation
. Tread rib
The industry of manufacturer’s designation for a rim by style or code.
A tread section running circumferentially around a tire.
. Rim width
. Tread separation
Nominal distance between rim
flanges.
Pulling away of the tread from the
tire carcass.
. Section width
. Treadwear indicators (TWI)
The linear distance between the
exteriors of the sidewalls of an
inflated tire, excluding elevations
due to labeling, decoration, or
protective bands.
The projections within the principal
grooves designed to give a visual
indication of the degrees of wear of
the tread.
. Sidewall
The rated cargo and luggage load
plus 150 lbs (68 kg) times the
vehicle’s designated seating capacity.
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.
. 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.
. Vehicle capacity weight
. 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 2.
. 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.