Porsche 92854 Owner's Manual page 80

Tires/Wheels
The original equipment tires on your Porsche
comply with all applicable Federal Motor Ve-
hicle Safety Standards.
F o r your driving s a f e t y r e m e m b e r the following:
• Wheel rims and wheel bolts are matched
to fit your Porsche.
• If y o u i n t e n d to u s e other than original equip-
ment wheels, be sure that they conform to
Porsche specifications for your model.
• The use of wheel rims and wheel bolts that
do not meet specifications of the original
factory installed equipment will affect the
safe operation of your vehicle.
• Before you plan on exchanging wheels, or
snow tires already mounted on wheel rims,
consult your Porsche dealer. He has the
technical information necessary to advise
you which wheel rims and wheel bolts are
compatible with the original factory instal-
lations.
Tire pressures
WARNING
Incorrect tire pressures cause increased
tire wear and adversely affect road holding
of the vehicle, leading to loss of control.
Always u s e an accurate tire pressure gauge
w h e n c h e c k i n g inflation pressures. D o n o t
exceed the maximum tire inflation pressure
listed on the tire sidewalk (Also refer to
"Technical data"). Cold tire inflation pres-
sure means: when a car has not been dri-
ven for at least 3 hours or less than 1 mile.
Never let any air out of warm tires to meet
cold tire pressure specifications.
Tire traction
WARNING
When driving on wet or slushy roads, a
wedge of water may build up between the
tires and the road. This phenomenon is
known as aquaplaning and may cause
partial or complete loss of traction, vehicle
control or stopping ability. Reduce speed
on wet surface.
Tire life
Tire life depends on various factors, i.e., roads,
traffic and weather conditions, driving habits,
type of tires and tire care.
Inspect your tires at least every 2000 miles or
3000 km for wear and damage. If you notice
uneven or substantial wear, wheels might
n e e d a l i g n m e n t o r tires should b e balanced o r
replaced.
Tires must always remain on same side of
vehicle.
After changing, adjust tire pressure and torque
wheel nuts diagonally to 94 ftlb ( 1 3 0 Nm). See
"Changing wheels".
Tire wear
The original equipment tires on your Porsche
have built-in wear indicators. They are mold-
ed into the bottom of the tread grooves and
will appear as approximately 1/2 in ( 1 2 m m )
bands when the tire tread depth is down to 1/16
of an in (1.6 mm).
When the indicators appear in two or more
adjacent grooves, it is time to replace the tires.
We recommend, however, that you do not let
the tires wear down to this extent. Worn tires
cannot grip the road surface properly and are
even less effective on wet roads.
In the United States, state laws may govern
the minimum tread depth permissible. Follow
all such laws.
WARNING
Do not drive with worn tires or tires show-
ing 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.
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