1930 Cadillac Brochure Front Cover - GM Heritage Center

To place a tire and rim on the carrier, reverse the above order.
After tightening the clamping screw, unlock the lock and put it
into place.
Use of Jack in Changing Tires
When a tire is "flat," the axle is not always far enough above
the ground to permit placing the jack directly under the axle.
28 and 29. Disc and demountable wood wheels are changed in
the same manner as wire wheels except that the hub caps should
not be removed.
Tire Balancing Marks
The tires are balanced to offset the weight of the valve stem.
If a tire is removed, it must be re-installed in its original position
with respect to the rim; otherwise the tire and wheel will be
unbalanced.
A small red square is accordingly branded in the rubber on
the side of each tire. This mark must always be in line with
the valve stem.
Fig,. 16. The correct position of the jack for raising either front or rear wheels
is shown above.
It is then necessary to make use of the adjustable shoulder which
engages with teeth on the side of the jack.
The illustrations in Figure 16 show how the adjustable
shoulder should be placed under the axles.
Changing Tires
If an inflated tire is always carried on the spare rim or wheel,
the driver will seldom or never have to disassemble a tire from
the rim. In case of tire trouble, it is then merely necessary to
remove the rim or wheel with the flat tire and then install the
spare in its place. Illustrated directions for performing this
work on wire and on standard wood wheels are given on pages
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