7-20 Vehicle care and maintenance
7Tires
N00939200478
It is important to familiarize yourself with the following terms:
Cold tire pressure:
• The measured pressure after the vehicle has been parked
for at least three hours,
or
• The measured pressure when the vehicle is driven less
than 1 mile (1.6 km) after having been parked for three
hours.
Maximum inflation pressure: the maximum permissible
cold tire inflation pressure for this tire.
Recommended inflation pressure: the inflation pressure
for optimum tire performance.Intended outboard sidewall:
• The sidewall that contains a whitewall, bears white let-
tering 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.
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 10,000
pounds or less.
Light truck (LT) tire: a tire designated by its manufacturer
as primarily intended for use on lightweight trucks or mul-
tipurpose passenger vehicles.
Tread: portion of a tire that comes into contact with the
road.
Tread rib: a tread section running circumferentially
around a tire.
Tread separation: pulling away of the tread from the tire
carcass.
Carcass: the tire structure, except tread and sidewall rub-
ber which, when inflated, bears the load.
Sidewall: portion of a tire between the tread and bead.
Section width: the linear distance between the exteriors of
the sidewalls of an inflated tire, excluding elevations due
to labeling, decoration, or protective bands.
Bead: the part of the tire that is made of steel wires,
wrapped or reinforced by ply cords and that is shaped to
fit the rim.
Ply: a layer of rubber-coated parallel cords.
WA R N I N G
!Driving with tires that are worn, damaged or
improperly inflated is dangerous.
These type tire conditions will adversely affect vehi-
cle performance.
These type tire conditions can also cause a tread sep-
aration or blowout which may result in an accident
causing serious injury or death.Tires, including spare tire, degrade over time with
age even when they are not being used. It is recom-
mended that tires over 6 years generally be replaced
even if damage is not obvious.
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