Glossary Of Tire Terminology - Subaru Legacy 2015 Owner's Manual

The vehicle placard shows original
tire size, recommended cold tire
inflation pressure on each tire at
maximum loaded vehicle weight,
seating capacity and loading infor-
mation.
Adverse safety consequences
of under-inflation
CAUTION
Driving at high speeds with
excessively low tire pressures
can cause the tires to flex
severely and to rapidly be-
come hot. A sharp increase
in temperature could cause
tread separation, and failure
of the tire(s). Possible result-
ing loss of vehicle control
could lead to an accident.
Measuring and adjusting air
pressure to achieve proper in-
flation
Check and, if necessary, adjust the
pressure of each tire (including the
spare) at least once a month and
Consumer information and Reporting safety defects/Tire information
before any long journey. Check the
tire pressures when the tires are
cold. Use a pressure gauge to
adjust the tire pressures to the
specific values. Driving even a
short distance warms up the tires
and increases the tire pressures.
Also, the tire pressures are affected
by the outside temperature. It is
best to check tire pressure out-
doors before driving the vehicle.
When a tire becomes warm, the air
inside it expands, causing the tire
pressure to increase. Be careful not
to mistakenly release air from a
warm tire to reduce its pressure.

Glossary of tire terminology

.
Accessory weight
The combined weight (in excess of
those standard items which may be
replaced) of automatic transmis-
sion, power steering, power brakes,
power windows, power seats, radio,
and heater, to the extent that these
items are available as factory-in-
stalled equipment (whether in-
stalled or not).
.
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.
.
Bead separation
A breakdown of the bond between
components in the bead.
.
Bias ply tire
A pneumatic tire in which the ply
cords that extend to the beads are
laid at alternate angles substantially
less than 90 degrees to the center-
line of the tread.
.
Carcass
The tire structure, except tread and
sidewall rubber which, when in-
flated, bears the load.
.
Chunking
The breaking away of pieces of the
tread or sidewall.
.
Cold tire pressure
The pressure in a tire that has been
driven less than 1 mile or has been
standing for three hours or more.
CONTINUED
13-5