Tire Safety Information
Pin Weight The downward force applied to the 5th wheel or gooseneck ball, by
the trailer kingpin or gooseneck coupler.
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 those installed regular
production options weighing over 2.3 kilograms (5 lbs.) in excess of those standard
items which they replace, not previously considered in curb weight or accessory
weight, including heavy duty brakes, ride levelers, roof rack, heavy duty battery,
and special trim.
Radial ply tire 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 pressure This is the inflation pressure provided by the
vehicle manufacturer on the Tire Information label and on the Certification / VIN
tag.
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.
Rim diameter This means the nominal diameter of the bead seat.
Rim size designation This means the rim diameter and width.
Rim type designation This means the industry of manufacturer’s designation for
a rim by style or code.
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.
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