Lexus SC 430 2002 Manual page 330

CHASSIS
NOTICE
Low profile tire like 245/40ZR18 may have greater
damage than usual tires to its tire wheel when receiving
impact from the road surface. Therefore, pay attention
to the following.
D Be sure to use with proper tire pressure. If the tire
pressure is low, the tire may have greater damage.
For detailed information about tire pressure, see
page 306 or 309.
D Avoid driving onto high, sharp−edged objects and
other road hazards. Failure to do so can lead to
severe tire damage.
The effectiveness of snow tires is lost if the tread wears
down below 4 mm (0.16 in.).
If you have tire damage such as cuts, splits, cracks deep
enough to expose the fabric, or bulges indicating internal
damage, the tire should be replaced.
If a tire often goes flat or cannot be properly repaired due to the
size or location of a cut or other damage, it should be replaced.
If you are not sure, consult with your Lexus dealer.
If an air loss occurs while driving, do not continue driving with
a deflated tire. Driving even a short distance can damage a tire
beyond repair.
312
Any tires which are over 6 years old must be checked by
a qualified technician even if damage is not obvious.
Tires deteriorate with age even if they have never or seldom
been used.
This also applies to the spare tire and tires stored for future
use.
NOTICE
D When you purchase new tires, consult your Lexus
dealer. If you change from run−flat tires to standard
tires, a spare tire should also be purchased.
D When the tires must be repaired or replaced, have
them repaired or replaced by Lexus dealer or
authorized dealer. The tire pressure sensors will be
affected by the installation or removal of tires.
D When the tires must be replaced, replace the
grommets for air pressure sensors as well.