Omaha daily bee., 1916-10-01
SUNLIGHT RIOTS
IL, -
l TIRES QUICKLY
Covers for Extra Tubes Save
the Resiliency of the
Rubber.
LEAVE CASINOS ON SHOE

mics OF ruDDer. III rotS ana destroys
tires very quickly. and yet very little
attention is paid to it by the ordi-
nary motorist A spare tire that has
been carried unprotected on the rear
OF the car for some time will often
blow out in the course Of few hun
dred miles, although it may have been
.Aew and never used before.
THE owner OF the car will be indig-
nafit and blame the tire manufacturer
when it is really his fault because he
has failed to take the precautions
that he should.
Two or three dollars spent for a
tire cover will earn that much in
few months by saving the resiliency
of the rubber. There is a great
amount of importance in the handling
of spare tires, and the subject is
worth the study of every one who
owns motor car and who is anxious
to operate it at the lowest possible
cost.
You may have wondered at times
why the tire companies so carefully
wrap the casing in many layers Of
wound paper. 1t is nuisance to re-
move this paper in case tire has to
be changed in hurry, and very pos
sibly you have felt shade of annoy
ance that you had to hunt around for
a knife in order to cut the windings
Of paper off the tire.
Done for Purpose.
As a matter Of fact, that paper
winding has been placed upon the
tire in order to deliver to you better
shoe--onc with more life and with
out soft spots due to rot.
Car manufacturers have made quite
4 3sstudy of the best way to carry
sapare time. II is an odd part that does
not seem to belong the the car proper
3nd, therefore, every effort has been
made to accommodate the extra shoe
to the lines OF the body.
At one time 1t was customary both
IN this country and abroad to carry
che extra tire on the running board.
This is the exception now, rather
than the rule, in this country. The
symmetry Of the car is maintained
better II the tire Is put at the rear,
and this is now almost universal with
American-made cars. The foreign
cars, on the other hand, largely ad-
here to the running board position
for the tire, and very often there is a
we'll in the running board into which
these tires fit.
In the rear position it is particularly
necessary that the extra tire-carricr
Be rigid. II Is very interesting to
see how this ,uality Of rigidity has
been attained ny the different manu-
n facturers. In some cases the support
ling member is almost an integral part
of the frame, and Il so solid that the
whole car could be lifted by the tire
4 carrier without straining It.
Extra Shoes Help.
Two large extra shoes carried be.
hind car will make quite d fer
.erce IN the handling Of the e.f al
high speed. In racing cars, when the
Balance OF the car is worked out, i,
is necessary to take into consideration
bvery pound Of weight.
If the center of gravity is some
where near the center OF the car, ther
the extra tires are quite distance
from this point and exert great lev,
eragc upon the entire car. In turn
ing corners at high speed the diff
ference in steering the car is particu
lArly noticeable.
There is also an increase in ten
deney to skid on slippery surfaces !
the weight Of the tires is not allowed
for in balancing the car, In genera
the car Is driven At speed Of abou
twenty miles an hour, and there il
no noticeable effect. AT forty miles
III hour and upward the effect Of th'
extra tires becomes marked, ant
hence must be watched in the de
signing room in laying out the bal
arlce.
One OF the mistakes that car own
ers will make frequently is to belicv'
that the spare tire will hold its pres
sure indefinitely because II is not II
use. It must be remembered tina
rubber is porous. II Il could be seer
under q microscope that would mag
niIy the surface [,uUV tiiitCA TIC w
,sefver would be surprised to note ths
Ii Is full Of minute holes. These hole
ire SO small that the air leaks through
.1ery slowly. Nevertheless, the leak
age Is sure, and after a while. tn
pressure has dropped considerably.
In going over the car and gaugini
the tires the spare shoes should re
eeiye the same consideration as thos
which are doing actual service on tn
wheels. 1t is not possible to kick tn
spafe shoe, and because It feels har'
to the foot, to assume that II is pump
ed to full pressure. The tires pres
sure should be measured with
gauge. 1t should also be kept up t
full recommended pressure. There !
growing tendency among all ca
users to lower the pressure in thei
tires under the belief that by dom
so they are obtaining more mileag,
Nothing could be further from tn
truth than this.
have frequently seen people wit
34x4 shoes using sixty pounds pres
sure in the front and sixty-five pound
in the rear tires and believing tina
they were doing the best possibl
thing to obtain long mileage. As
matter of fact the pressure shout
have been eighty in the rear an
scventy-five in the front shoes.
L-