Porsche 928 S 1984 Owner's Manual page 75

Tires/Wheels
The original equipment tires on your Porsche
comply with all applicable Federal Motor Ve-
hicle Safety Standards.
For your driving safety remember the following:
• Wheel rims and wheel bolts are matched
to fit your Porsche.
• If you intend to use 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.
72
Tire pressures
WARNING
Incorrect tire pressures cause increased
tire wear and adversely affect road holding
of the vehicle, leading to loss of control.
Always use an accurate tire pressure gauge
when checking inflation pressures. Do not
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
need alignment or tires should be balanced or
replaced.
Tires must always remain on same side of
vehicle.
After changing, adjust tire pressure and torque
wheel nuts diagonally to 94 ftlb (130 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
bands when the tire tread depth is down to V16
of an in (1.6 mm).
1
/2 in (12 mm)