Toyota Prius Owner's Manual page 440

4-3. Do-it-yourself maintenance

When to replace your vehicle's tires
Tires should be replaced if:

You have tire damage such as cuts, splits, cracks deep enough to
expose the fabric, and bulges indicating internal damage.

A tire goes flat repeatedly or cannot be properly repaired due to the size
or location of a cut or other damage.
If you are not sure, consult with any authorized Toyota dealer or repairer, or
another duly qualified and equipped professional.

Replacing tires and wheels (vehicles with the tire pressure warning
system)
If the ID code of the tire pressure warning valve and transmitter is not regis-
tered, the tire pressure warning system will not work properly. After driving
for about 20 minutes, the tire pressure warning light blinks for 1 minute and
stays on to indicate a system malfunction.

Tire life
Any tire over 6 years old must be checked by a qualified technician even if it
has seldom or never been used or damage is not obvious.

Routine tire inflation pressure checks (vehicles with the tire pressure
warning system)
The tire pressure warning system does not replace routine tire inflation pres-
sure checks. Make sure to check tire inflation pressure as part of your rou-
tine of daily vehicle checks.

Low profile tires (vehicles with 17-inch tires)
Generally, low profile tires will wear more rapidly and tire grip performance
will be reduced on snowy and/or icy roads when compared to standard tires.
Be sure to use snow tires or tire chains on snowy and/or icy roads and drive
carefully at a speed appropriate for road and weather conditions.
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