Honolulu star-bulletin. [volume] (Honolulu [Oahu, Hawaii]) 1912-2010, 1917-06-16
TIRE CARE IS TIRE Economy;
SLMPLERULES Will SAVE MONEY

"QS0 IQ0 LlTeS nave USSu IcHOfCN
for any reason it is a good plan, wher
reapplying, to reverse them, that Is
to place the worn sides Of the tires
! toward the car It Is not generally
known, though it is a fact, that almost
! all the side wear to a tire occurs on
{ the side from the car. This is due ia
road construction, rut wear, curb
scraping, etc.
The style Of car construction, power
speed, road conditions, the expert or
careless driver and especially the
weight and distribution play an i'm
portant part with strains to which
the tires will be subjected-conse'
quently, a fixed rule for initiation
would, in view of these things, pro-
duce different results.
Ordinarily, the tires on front wheels
should be inflated between fifteen and
eighteen pounds per inch of tire sec
ton (34x4), 15x4 sixty pounds or 1874
seventy-two pounds, and the rear tires
fifteen to twenty pounds per inch Of
tire section (34x4 - 20x4 - eighty
pounds.
Resiliency OF the tires is primarily
governed by the construction and
quality, but It Is largely influenced by
the initiation and weight carried.
Naturally a 4-inch tire inflated to
seventy pounds air pressure and
carrying 800 pounds weight will ride
easier than the game size of tire with
the same initiation, and carrying 700
pounds weight. Inc heavier weight
causes more DETECTION Of the tires on
the ground and increases the action
of the side walls, thereby adding to
the comfort of the ride. Increasing
the DETECTION or flattening of tires,
either by extra weight or reducing
the air pressure, causes more OF the
vibration to be absorbed by the tires
than oy the springs Of the car.
When soft, thu tire runs against a
wave in the tread rubber which Will,
from excessive stretching and heat
ing, pull away and separate from car
cas- of body. The heat from increased
action in the side walls Of under
inflated tires softens the rubber Ce.
ment of adhesiveness between tic
fabric layers - devrllcanization takes
place to some degree. Too much de-
Election of the tire also means an ii
regular tension II one layer Of fabriG
in relation to another-they pull apart,
chafe, and later, when striking al
stone, rough place or rut blowout
may occur.
There seems TO be an impression OF
danger from blowouts due to expan.
sion, especially during the hot wealth
er. There is some expansion, but, as
a matter of fact, it is not in proper
ton to the increase in temperature.
For example, II the temperature Of
the afr in q tire increases from GO
TO 80 degrees it GOES not follow that
the air pressure per square inch In
creases' from 90 to 80 pounds. 1t &C
tually means an increase Of three |
pounds pressure per square inch, 1. e.,
the pressure increases from 60 to SO
pounds.
New tires stretch slightly after III
service a while and inner tubes, when |
heated to a certain degree are slight
Iy permeable to nitrogen and occa-
sonal imitation is, therefore, advis-
able. DeterioratIng effects Of stale
air can be avoided by filling the tires
with fresh air at least two or three
times q year.
The tires should not be inflated with
he exhaust from the engine, as oil
md certain gases are destructive to
-ubber. This does not have reference
70 pumps operated by power from the
engine.
Don't make the mistake Of guess
ng at the initiation from appearances
,r by striking the tires with a ham
ner; use a pressure gauge at least
very week. The tires sometimes ap
,ear to round up pretty we'll, but when
ested with a gauge it may be found
hat the pressure is entirely too low
o insure the best results.
We believe the most satisfactory in
lation method is to pump up the tires
n accordance with formula, then, if
necessary, reduce the pressure slight
y until they do not cause excessive
ibration to the car and traction slip
age of the rear wheels. Make a rec
I'd Of the pounds pressure at this
ONT and, If always maintained, the
reatest efficiency from tires and car
rfll he enioVed