Subaru 1998 Impreza Owner's Manual page 278

specifications. Check the tire pressure when the tires are cold. Cold
means that the vehicle has been parked for three hours or has been
driven less than 1 mile (1.6 km).
The recommended tire pressure and sizes are provided on the tire
placard, which is located under the door latch on the driver's side.
Tire wear will vary with each wheel. To increase the life of tires and keep
wear uniform, it is best to rotate them every 7,500 miles (12,000 km).
When rotating tires, replace any unevenly worn or damaged tire. After
rotating the tires, adjust tire pressure and be sure to check wheel nut
tightness.
A tire should be replaced when the tread wear indicator appears as a
solid band across the tread. The indicators appear when the remaining
tread has been worn to 0.063 in (1.6 mm) or less.
HG0278
New tread
OM-H0230
Maintenance and service
Worn tread
Tread wear indicator
OM-H0231
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