Consumer information and Reporting safety defects
13-9
sory weight, including heavy duty
brakes, ride levelers, roof rack,
heavy duty battery, and special
trim.
. 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
. Radial ply tire
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.
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 recommended by a vehicle manufacturer.
. Reinforced tire
A tire designed to operate at higher
loads and at higher inflation pressures than the corresponding standard tire.
. Rim
A metal support for a tire or a tire
and tube assembly upon which the
tire beads are seated.
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
. Rim diameter
The rim on which a tire is fitted for
testing, and it may be any rim listed
as appropriate for use with that tire.
Nominal diameter of the bead seat.
. Tread
. Rim size designation
That portion of a tire that comes
into contact with the road.
Rim diameter and width.
. 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 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,
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