Porsche 928 GTS 1994 Owner's Manual page 90

WARNING
Do not drive with worn tires or tires showing
cuts or bruises as they may lead to sudden
deflation.
If you notice that tires are wearing unevenly,
consult your Porsche dealer. Uneven wear may
not always be due to improper wheel alignment.
It can be the result of individual driving habits
such as cornering at high speeds. If the tire
pressure is not checked and adjusted regularly,
abnormal tire wear can also occur.
Tire care
WARNING
Avoid damaging tires and wheel rims. If you
must drive over a curb or other obstacle,
drive slowly and at an obtuse angle.
Frequently check tires for uneven wear and
damage.
Remove imbedded material.
Replace worn or damaged tires immediately.
Replace missing valve dust caps.
Keep oil, fuel, brake fluid, etc. away from
tires.
Keep tires inflated correctly.
Tire damage/puncture
Regularly check tires for imbedded material,
cuts, punctures, cracks and bulges (side wall).
For safety reasons do not use tire inflating bot-
tles to inflate a flat tire.
In case of tire damage, where it is uncertain
whether there is a break in the ply with all its
consequences or tire damage caused by ther-
mal or mechanical overloading due to a loss of
pressure or any other prior damage, we recom-
mend that the tire be replaced for safety rea-
sons.
If one faulty tire is replaced it should be noted
that the difference in tread depth on one axle
must not exceed 30 %. Handling inconsistencies
may result.
Performe visual inspection.
Parking at the curb
Hard impacts against curbs (or traffic islands)
are dangerous and may cause hidden tire dam-
age which is not noticeable until later. (Danger
of accidents at high speeds). Tires have a
memory!
WARNING
It you must drive over a curb, drive slowly
and, if possible, at a right angle. Exercise
care when parking along curbs.
Tire replacement
If in doubt, contact your Porsche dealer or
Porsche importer of your country. If you do
not use a Porsche recommended replace-
ment tire, make sure that you purchase
your new tires from a reputable tire spe-
cialty dealer and that the dealer complies
with all manufacturers warnings for those
tires.
Before mounting new tires, check with your
Porsche dealer about the current release
status.
For tires with ZR quality standard, there are
currently no standards concerning tire strength
at speeds above 240 km/h (150 mph).
For this reason, only use tire makes and types
tested by Porsche.
Tires should be replaced at least on one axle at
a time. Only tires of the same make and type
must be combined. Mixed tires are not permis-
sible.
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