Porsche 928 GTS 1994 Owner's Manual page 92

Before mounting snow tires, consult with your
Porsche dealer. He has the technical information
necessary to advise you on wheel and tire com-
patibility.
Snow tires should have the same load capacity
as original equipment tires and should be
mounted on all four wheels. Snow tires with
studs should be run at moderate speeds when
new in order to give the studs time to settle.
When fitting tires already mounted on rims, en-
sure that the colored wheel bolt is always
across from the valve. Always screw the locka-
ble wheel nut onto this bolt. When removing,
mark the direction of rotation on each wheel,
e.g. FR, FL, RR and RL. This precaution ensures
that the wheels will be remounted in the same
position, thus obviating the risk of imbalance.
WARNING
Tires with badly worn treads and studs are
very dangerous. Make sure they are re-
placed immediately.
Do not drive a vehicle equipped with snow tires
at prolonged high speed. Snow tires do not
have the same degree of traction on dry, wet or
snowfree roads as a normal tire. Furthermore,
snow tires wear rapidly under these conditions.
Snow tires do not fulfill their purpose if the tread
depth is less than 5/32 in/4 mm. Comply with
all state and local laws governing snow tire
and tread depth requirements.
Snow chains
WARNING
Snow chains cannot be fitted on standard
size wheels. To prevent damage to body,
axle or brake components, snow chains can
be fitted only to the rear wheels, and only
with the tire/rim combination listed in the
Technical Data.
To ensure adequate clearance between chain
and body, Porsche recommends only the use
of fine-link chains such as those approved by
Porsche.
Follow instructions issued by the supplier of the
chains.
Different states and countries have varying
statutory requirements regarding
speed. Check with local authorities for possible
restrictions.
Remove chains as soon as roads are free of ice
and snow.
Tire designations
Due to new speed and load ratings for radial
tires, new designations have come into force for
snow tires for your Porsche.
The designation to be used for ZR tires is e.g.,
225/45 ZR 17 (Z = code letter for radial tires
for speeds above 240 km/h (150 mph).
maximum
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