The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1913-10-20
TIRE TROUBLE
DUE MAINLY TO
ER-lNFLATlON
Manager Of Goodyear Adjusting
Department Gives Valuable
Advice
BY =. A. HENDERSON,
Manager Adjusting Department The
Goodyear Tire 4 Rubber Com


pany, Akron, Ohio.
pneumatic tire consists of two
things, OF which one is as important
as the other One of these is an air
cushion the other is an envelop for
retaining air under pressure and max
ing this air cushion possible. This
envelop is spoken OF by the trade as
the tire and as every motorist knows,
consists OF casing and an inner
tube; the casing to resist road wear
and the tube to furnish an alright
Enclosure for the air inside. The cas-.
Ing Is made OF rubber and fabric. and
the tube of rubber This mass q:
rubber and fabric construction will
n0fcGuDeaaH the weight Of any car;
it'oyth0 ar cushion II retains that
supports the cars weight
Naturally, larger car will require
more OF an air cushion than q smaller
and In the same way, larger tire 10
carry this larger air cushion. A car
Of a given weight requires tire of a
given size containing air under a Civ.
en- pressure.
Let us consider the result when the
tire does not contain proper air pres
sure. 1t has already been pointed out
that the tire itself can't sustain
weight, but that this ID the purpose
Of the air cushion inside. But when
this air cushion consists of air under
insufficient pressure, the tire is fore.
ed TO sustain part OF the weight itself,
exactly in proportion to the deficiency
in the air pressure. something 1t is
not built to do.
The first result Is that the weight
above being no longer properly sus.
tanned, fattens the tire out where 1t
rests on the ground. Then, when the
car Is put in motion. every part Of
the tire, on reaching the bottom, must
assume this unnatural fattened
shape. Each side must bent out ana
then back again at every revolution.
The body of the casing consists OF
several plies of fabric united as
whole by the rubber. which has been
vulcanixed through and through. And
when the side walls bend In and out
because of under inflated condition
these fabric layers do not unite their
strength and act as unit. as they
are meant to, but the unnatural bend
ing makes one layer pull against the
one next to It. They fail to reinforce
each other as they should.
Continually pulling against each
other, these fabric layers In time pull
apart, separating from EACH other.
The same conditions which caused
them to pull against each other now
cause them to rub and chafe. This
roduces friction and heat. The DIFF
ierent~ layers soon wear each other
out, and as soon as some one place
becomes too weak to sustain the in
side air pressure, the tire gives way
with q blowout"
The tire manufactures tries to
make perfect castings and tubes. a
perfect casing and tube Is one of the
factors Of good tire service. The 9TH
err factor Is correct air pressure, and
this Is up to the m0torist.
There are several kinds of tire
abuse, but as proper imitation is sc
vitality important, insufficient imitation
Is more damaging than anything else.
The statistics compiled BY all the
leading tire manufacturers. indicate
that more than IS per cent OF tires
that have gone out Of service prems-
turely. did so because of insufficient
imitation.
There are several indications of un.
derinflation. The most common one
Is the condition of the inside fabric.
determination separates the fabric
layers and this separation shows 1t.
self by means OF a ridge or roll OF
fabric on the lower part of the side
wall on the inside of the casing. This
Is before the tire Is ready to give way
completely. After a tire with sepa-
rated fabric Is run awhile and then
removed. 1t will be found that the
fabric at the place II was rolled UP
into n ridge before. is now cracking
and beginning to break. In this con-
a.un u Is coon ready to give way.
Another condition Is the loosening
at the tread. determination produces
a little roll right In front OF the point
of contact with the ground which in
time tends to separate the tread.
In the case OF clincher tire, uu-
derinAation usually permits the tire
IN bo r3yn-cut hofore thu fabric gives