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Rim width
This means the 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 protective 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 sidewall.
Special Trailer (ST) tire
The "ST" is an indication the tire is for trailer use only.
Test rim
The rim on which a tire is fitted for testing, and 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.
Tread wear 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 68 kilograms (150 lbs.) times the vehicle's designated seating capacity.
Vehicle maximum load on the tire
The 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
The 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 I of CRF 49 571.110) and dividing by 2.
Weather side
The surface area of the rim not covered by the inflated tire.
Wheel center member
In the case of a non-pneumatic tire assembly incorporating a wheel, a mechanical device which attaches, either
integrally or separably, to the non-pneumatic rim and provides the connection between the non-pneumatic rim and
the vehicle; or, in the case of a non-pneumatic tire assembly not incorporating a wheel, a mechanical device which
attaches, either integrally or separably, to the non-pneumatic tire and provides the connection between tire and the
vehicle.
Wheel-holding fixture
The fixture used to hold the wheel and tire assembly securely during testing.
Gravity Tender V1.0
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