Lexus CT200h Owner's Manual page 518

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 Lexus dealer or repairer, or
another duly qualified and equipped professional.

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.

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.

If the tread on snow tires wears down below 4 mm (0.16 in.)
The effectiveness of the tires as snow tires is lost.
516
CT200h_OM_OM76067E_(EE)