Honda 1991 Prelude Owner's Manual page 110

Tire Replacement
Honda recommends that you replace tires in sets of four, or in pairs,
front or rear. If you need to replace only one tire, mount the new
tire opposite the tire showing the least amount of wear.
For instance, if the left front tire shows the least amount of wear,
mount the new tire on the front right side.
The original tires on your car
have tread wear indicators to
indicate when they should be
replaced. The indicators appear
as bands about 12.7 mm (1/2 in)
wide when the tire tread depth
is less than 1.6 mm (1/16 in).
When indicators appear across
two or more grooves in a row,
you should replace the tire.
Driving on worn-out tires is very hazardous, and will reduce
braking effectiveness, steering accuracy and traction.
When replacing tires, use only the recommended tire size. Wheel
rim widths and offsets must be those recommended by American
Honda Motor Co., Inc. Contact the Zone Office nearest you as
shown on the inside of the back cover.
Tires and wheels other than those recommended may be unsafe.
Do not mix radial and bias ply tires on the same car.
Tire Balancing
Unbalanced tires may affect handling and tire wear. A tire should
always be rebalanced after it has been dismounted from the wheel.
Your original tires were properly balanced before the car left the
factory, but may need rebalancing at some time during the life of the
tire. Tire balancing for the COMPACT spare is not necessary.
CAUTION:
Use only genuine Honda aluminum wheel weights if your car is
equipped with aluminum wheels. Non genuine Honda wheel
weights may corrode and damage the aluminum wheel.
INDICATOR
LOCATION
MARKS
TREAD WEAR
INDICATORS
(cont'd)