Honda 1990 Civic Sedan Owner's Manual page 104

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Spare Tire (cont'd)
The COMPACT spare tire has a
much shorter tread life than
regular tires. Replace the tire as
soon as tread wear indicators
appear as solid bands across the
tread. Replace with a tire of
exactly the same size and
construction.
The COMPACT spare tire and wheel set was designed
especially for your car; do not use it on any other vehicle; do not
install any other tire on this wheel which is not identical to the
original in size and construction, and do not use the COMPACT
spare tire on any other wheel.
Because the COMPACT spare is smaller in size and higher in air
pressure than a regular tire, it will ride more harshly with less
ground clearance and may have less traction on some road
surfaces. Drive cautiously.
TREAD
WEAR
INDICATOR
INDICATOR
LOCATION
MARK