Cadillac 1975 Owner's Manual page 74

FIG. 5-9: TIRE TREAD WEAR
INDICATORS
fabric is exposed, tire replacement due to
tread wear is recommended.
To equalize wear, it is recommended that
tires be rotated according to the diagram in
Fig. 5-10 or 5-11. Radial tires should be ro¬
tated at the first 7,500 miles and then at
least every 15,000 miles thereafter. For the
longest tire life, any time irregular wear is
noticed, have the tires inspected and rotated
by your car or tire dealer and have the
cause of the uneven wear corrected. Be cer¬
tain to check wheel nut tightness (see "Jack¬
ing Instructions") and to adjust the tire pres¬
sures after rotation to agree with those re¬
commended on the tire inflation placard in¬
side glove compartment door.
NOTE: It is recommended that disc brake
pads be inspected for wear whenever tires
are rotated.
Tire Damage and Repair — Tires with cuts,
splits or cracks deep enough to expose the
fabric, should be removed from service.
Bulges usually indicate internal damage, and
the tire should be removed. Tires with ques¬
tionable damage should be removed from the
wheel and examined by an expert.
If an air loss occurs while driving, do not
attempt to drive on the deflated tire more than
is necessary to stop safely. Driving even a short
distance can damage a tire beyond repair.
Temporary repairs, such as "blowout"
patches, or any repair made from the outside
of the tire should not be made except in
emergencies. Such "stop-gap" devices as
plugs and aerosol-type sealants are good for
no more than 100 miles of driving at speeds
not over 50 mph. A permanent vulcanized
repair or patch applied from inside the tire
should be made as soon as possible. Also, the
installation of an inner tube in a damaged
tubeless tire is not a recommended repair pro¬
cedure.