1991 Honda Accord Owner's Manual - Page 118
1991 Honda Accord Manual
Page 118 highlights
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