Pueblo chieftain., 1921-07-17
EXPERT ADVICE
ON CARE OF TIRES
Service Department Of United
States Tire Company
Gives Data

10 NOT 'naHke lnl1auon preaSuree
Il with changes in atmospheric temper
I ature. since more damage results from
endeavoring to compensate for an in
crease in the tire temperature than
Is caused by the increase in tempera-
ture itself. Avoid running on a fiat
4 tire Such practice ruins the tube
and breaks the casing at the bead or
sidsw.all.
II you collect automobile racing stat
istics. you will find that the average
life of a high grade tire on a racing
car is under 500 miles-which is about
one-twentieth of the life of tire OPP
GRATED under ordinary conditions. This
difference in tire service is due direct
ly TO a difference in heat developed.
Heat eNerts deteriorsting effect
on vulcauized rubber in proportion to
the Intensity and length of time the
rubber Is exposed to II. The source
of heat that does most damage is that
produced at high running speed by
the informal friction of the tire car
Cass The heat developed by fractional
contact with the road when travelling
rapidly also has some influence. Tires
are 50 designed as to resist the ef-
fects Of heat produced by ordinary
everyday car operation. But tires can
not long remain intact when highly
heated by continuous or even intermit-
tent speeding, and the results OF such
practice a,e rapid loss OF elasticity and
neNibility which leads to complete tire
carcass break down, From the stand
point Of tire lie, mechanical upkeep,
and gasoline econJny. car speeds
should he kept within prescribed limits.
Among the factors which have an
intimate relation to tire mileage is
wheel alignment. The free rolling mo
ton OF a tire IL affected by a small
wheel misalignment and the result is
excessive tread wear. when the two
opposite wheels are not parallel there
is diagonal glrnd at the point where
the tires come in contact with the road
surface which wears on the rubber al
most al last as IL in contact with an
emery wheel.
Front wheels may be out OF align
ment due to cross rod, axle, or steer
ms knuckle becoming bent by con-
tact with curb or some other obstruc-
ton. or the cross rod or knuckle may
be improperly adjusted. Also the tire
alon> or the tire and rim may be i'm
properly mounted on the wheel
Because OF tho tendency Of front
wheels to spread during driving. car
manufacturers set the wheels att
joe-in OF from ;, to n inch and when
thus adjusted the wheels are properly
aligned. Tna svircments showing
these differences should be made be-
tween the felloes Of the two front
wheels at points inside and on a level
with the axle Alignment or the toe-in
of the wheels should not he confused
with dish which IL setting the wheels
farther apart at the top than at the
bottom Frequent checking wheel
alignment saves tire wear. II Is
factor that should not be neglected.
Rough pavements and crossings
tempt the motor!st to drive on street
car tracks While II Is admittedly true
that the occasional use Of car tracks
where road conditions are almost i'm
passahle is tustlned, II Is also true
that the strain on certain parts of the
tire due to continuous running on car
tracks will not only quickly wear
depression In the tread rubber, all
around the tire. but the sharp bending
action and overload on the fabric dir
ectly under this deprs ssion Will pro-
duco ventually an inside fabric break.
Running on car tracks Is an expensive
habit and should be INDUCED in only
in extreme necessity.
A barefoot boy appreciates the need
Of quick attention to his surface cuts
and bruises which given temporary
protection are self healing. Tire tread
cuts are also self healing n promptly
treated with heai-a-cut material. "
not thus treated the elasticity OF tn"
rubber allows the cut 10 expand under
load compression with every turn Of
tho wheel. Dirt, glass. sand and peh-
tles wear and tear away the rubber
until the cut has reached the first layer
Of tire fabric where tho foreign mater
inl crceps lang and piles up between
tho tread rubber and carcass forming
sand Jumps
Most cuts are avoidalhe and the re-
suit Of tire contact with sharp edges
OF railway tracks and crossings. with
worn horscshoes. broken glass. wheels
spinning on wet pavemcnts and in mud
holes. and by skiddins the tire by sud
den brake application.
Tha remedy Is to examine the tires
a. regular intervals. with tho object Of
removing all penetrating objects such
az nails and tacks. to wash out the
holes and cuts and close them by
properly prepared healing preparations
Investment in tires does not end with
the original purchase To the first
payment should he added relatively
much smaller but important care in
vestment.
The use Of chains or other anti-skid
devices IL advisable under certain con-
ditions While well designed non
ekid tread Is. where care in driving
Is exercised. generally sur,cient irsur-
ance against slipping on wet psvementa
and hard surfaced roads, vet there are
conditions Of ice, mud, or deep SNOW
when chains are necessity md for
such occasions they should be carried
as regular equipment
Anti skid devices that are station
arv on the tire and wheel ara the cause
OF good deal of the unsatisfactory
service rendered hy tires A looss de-
vice particularly one that will creep
around the tire. and consequently dis
tribute the strain and wear Is much
to be preferred. Rut the best of de
vices. even tho mounted with the great
est cars should be used only when and
as long as is absolutely necessary