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Occupant distribution
The placement of passengers in a vehicle.
Outer diameter
The diameter of a new, properly inflated tire.
Overall width
Total width measured at the exterior sidewalls of an inflated tire, including the additional width of la‐
beling, decorations, or protective bands or ribs.
Passenger car tire
A tire intended for use on passenger cars, multipurpose passenger vehicles, and trucks, that have a
gross vehicle weight rating (GVWR) of 10,000pounds or less.
Ply
A layer of rubber-coated parallel cords.
Ply separation
A parting of rubber compound between adjacent plies.
Pneumatic tire
A mechanical device made of rubber, chemicals, fabric, and steel or other materials, that, when
mounted on an automotive wheel, provides the traction and contains the gas or fluid that sustains the
load.
Production options weight
The combined weight of installed regular production options weighing over 5lbs (2.3kg) more than
the standard items they replace, and not previously considered as curb weight or accessory weight.
These include, for example, heavy-duty brakes, ride levelers, roof rack, heavy-duty battery, and spe‐
cial trim.
Radial ply tires
A pneumatic tire in which the ply cords that extend to the beads are laid at substantially 90degrees to
the centerline of the tread.
Recommended inflation pressure
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