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tread separation - Pulling away of the tread from the tire carcass.
treadwear indicators (tWl) - 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 ibs.)
times the vehicle’s designated seating capacity.
Vehicle maximum load on the tire - The load on an ind ividual tire that is deterrrrined 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.
