Acura 1991 NSX Owner's Manual page 174

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If You Have A Flat Tire
11. Remove the wheel nuts and flat
tire.
Taking Care Of The Unexpected
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12. Before you put on the folding
spare tire, wipe any dirt off the
mounting surface of the brake
hub and the wheel. This will
assure a tight, even contact
between the wheel and hub.
13. Put on the folding spare tire with
the air valve toward the bottom.
Put the wheel nuts back on finger-
tight, then tighten them in a criss-
cross pattern with the wheel
wrench so the wheel is firmly
against the hub. Do not try to
tighten them fully. Inflate the
folding spare tire only when it is on
the car. Inflating it while it is lying
on the ground may trap stones or
other foreign matter between the
tire and the wheel rim.