Porsche 92854 Owner's Manual page 81

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 imme-
diately.
• Replace missing valve dust caps.
• K e e p oil, fuel, b r a k e fluid, etc. a w a y from
tires.
• Keep tires inflated correctly.
Tire damage
Regularly check tires for imbedded material,
cuts, punctures, cracks and bulges (side wall).
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 re-
commend that the tire be replaced for safety
reasons.
If one faulty tire on an axle is replaced it should
be noted that the difference in tread depth on
one axle must not exceed 30 %.
Perform visual inspection.
78
Parking at the curb
Hard impacts against curbs (or traffic islands)
are dangerous and may cause hidden tire da-
m a g e which is not noticeable until l a t e r . (Danger
of accidents at high speeds). Tires have a
memory!
WARNING:
If you must drive over a curb, drive slowly
and, if possible, at right angles. Exercise
care when parking along curbs.
Tire replacement
The tire makes and types specifically men-
tioned in your vehicle papers are binding.
When changing to different tires, be sure to
observe the applicable regulations in your
country. If In doubt, contact your Porsche
dealer or Porsche importer of your country.
If you do not use a Porsche recommended
replacement tire, make sure that you pur-
chase your new tires from a reputable tire
specialty dealer and that the dealer com-
plies with all manufacturers warnings for
those tires.
Before mounting n e w tires, check with your
Porsche dealer about the current release
status.
F o r tires with VR quality standard, there a r e
currently no final standards concerning tire
strength at speeds above 210 km/h.
F o r this reason, only use tire makes and types
tested by Porsche.
Tires should be replaced at least on one axle
at a time. As a matter of principle, only tires of
the same make and type should be combined.
Mixed tires are not permissible.
Whenever you replace tires, make certain that
you install new valves. Initially, new tires do
not have their full traction. You should there-
fore drive at moderate speeds during the first
60 -120 miles (100 - 200 km).
Have new tires mounted by an expert only.
Wheel balancing
A wheel should always be balanced after a tire
repair. Even with regular use a wheel can get
out of balance, and should, therefore, be ba-
lanced from time to time. Unbalanced wheels
may affect car handling and tire life.
If tires are fitted already mounted on their rims,
the direction of rotation and the position with
respect to the wheel hub should be marked
before the wheels are removed (e.g. by making
a clear mark on the stud nearest the valve).
This precaution ensures that the wheels will
be remounted in the same position, thus ob-
viating the risk of imbalance.
When balancing light alloy wheels, use only
adhesive balancing weights supplied through
the Porsche parts service.