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The man in the street cares little and knows less--how
tires are made. But he knows tires and you can't fool him. He
knows tires by what they'll do. He judges by results only and
no amount of "sales talk" can change him:
His judgment is that of PUBLIC OPINION:
Public Opinion has passed judgment and placed the stamp of
approval on National Speedway Tires: l
Now that judgment has been passed we are going to tell
National Speedway users the story of our great achievement;
This is how Internal Hydraulic Curing banishes blowouts, rim
cuts and stone bruises caused by structural defects:
National Speedway Tires are assembled on a new kind of core
a collapsible core that is taken apart and removed before the
tire is placed in the mold.
In this way the tire retains its proper shape, and no part is
displaced or distorted. The mold used is of the usual 2-piece con
struction. But it is made large enough to accommodate tfie tire
without an overlap. Thus the two halves are brought together
closing completely around the tire without applying an "'ounce
of pressure. "iV ,
Before the tire is placed in the mold, it is fitted with a
specially constructed inner tube of the exact shape anpl size of the
inside of the finished casing. Then when the tire is in the mold, this
tube is filled with water to a pressure of 200 lbs. to the square inch1
a wholly unique process, evolved from a long series of experi
ments. This pressure is maintained throughout the entire period
of curing. As the mold is closed before any pressure is applied,
pinching, bruising and distortion are impossible. THE CON
STRUCTION IS PERFECT. The materials are in keeping with
the methods used in building them into a finished tire. - They are
the finest that world's- markets aff or:
There is only one other tire in America with as high a rubber
content in its tread no other witji better stock throughout. It
does cost more to cure tires by internal hydraulic expansion. But
when built they are able to live up to their guarantee:
There- are practically no seconds. Adjustments are negli
gible. These savings cut a big slice off the manufacturing costs:
Though the National Speedway prdcess is more expensive than
the methods employed by other manufacturers, the resultant
elimination of "seconds" and adjustments has so considerably
reduced costs that we have'been able to list National Speedway;
tires considerably lower than other tires '-of similar, rating: T
.Every tree .guaranteed for 60,00 miles;
ATIONAL RUBBER PRODUCTS CORPORATION
' 660-662 North Broad Street, Philadelphia .'
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