Cadillac 1999 DeVille Owner's Manual page 266

Storing the Spare Tire and Tools
CAUTION:
Storing a jack, a tire or other equipment in the
passenger compartment of the vehicle could
cause injury. In a sudden stop or collision, loose
equipment could strike someone. Store all these
in the proper place.
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The compact spare is for temporary use only. Replace
the compact spare tire with a full
can. See the storage instructions label to replace your
compact spare into your trunk properly.
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size tire as soon as you