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Rim Type Designation
This means the industry of manufacturer’s designation for a rim by style or code
Rim Width
This means the normal 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 form 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 an 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
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 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 curb weight,
accessory weight, and normal occupant weight (distributed in accordance with Table 1 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 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
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