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TIRE SAFETY INFORMATION
3.4 GLOSSARY OF TIRE TERMINOLOGY
INTENDED OUTBOARD SIDEWALL The sidewall that contains a white-wall, bears white lettering or
bears manufacturer, brand, and/or model name molding that is higher or deeper than the same
molding on the other sidewall of the tire or the outward facing sidewall of an asymmetrical tire
that has a particular side that must always face outward when mounted on a vehicle.
LOAD RATING
MAXIMUM LOAD RATING
for that tire.
MAXIMUM PERMISSIBLE INFLATION PRESSURE
MAXIMUM LOADED VEHICLE WEIGHT The sum of curb weight, accessory weight, vehicle capacity
weight, and production options weight.
MEASURING RIM
NON-PNEUMATIC RIM A mechanical device which, when a non-pneumatic tire assembly incorporates
a wheel, supports the tire, and attaches, either integrally or separably, to the wheel center
member and upon which the tire is attached.
NON-PNEUMATIC SPARE TIRE ASSEMBLY A non-pneumatic tire assembly intended for temporary use
with the requirements of this standard.
NON-PNEUMATIC TIRE A mechanical device which transmits, either directly or through a wheel
or wheel center member, the vertical load and tractive forces from the roadway to the vehicle,
generates the tractive forces that provide the directional control of the vehicle and does not rely
NON-PNEUMATIC TIRE ASSEMBLY A non-pneumatic tire, alone or in combination with a wheel or
wheel center member, which can be mounted on a vehicle.
NORMAL OCCUPANT WEIGHT
OCCUPANT DISTRIBUTION -
umn of Table I of 49 CFR 571.110.
OPEN SPLICE Any parting at any junction of tread, sidewall, or inner-liner that extends to cord
material.
OUTER DIAMETER
OVERALL WIDTH
including elevations due to labeling, decorations, or protective bands or ribs.
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
PRODUCTION OPTIONS WEIGHT The combined weight of those installed regular production options
previously considered in curb weight or accessory weight, including heavy duty brakes, ride levelers,
roof rack, heavy duty battery, and special trim.