Porsche cayman gt4 Owner's Manual page 193

Tire replacements
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Use only tire makes and types tested by
Porsche.
If you do not use a Porsche recommended
replacement tire, make sure that you
purchase your new tires from a reputable tire
dealer and that the dealer complies with all
manufacturers warnings for those tires.
Only tires with the same manufacturer and
with the same specification code (e.g. "N0",
"N1"...) should be mounted on the vehicle.
Before mounting new tires, check with your
Porsche dealer about the current release
status.
Use tires with "ZR" quality standards. There
are currently no standards concerning tire
strength at speeds above 150 mph (240 km/h).
Tires should be replaced no less than on one axle
at the time. Only tires of the same make and type
must be used. Mixed tires are not permissible and
will affect vehicle performance, safety, and can
affect vehicle warranty.
Authorized Porsche dealers can recommend the
most current replacement tire options for your
vehicle.
Initially, new tires do not have their full traction.
You should therefore drive at moderate speeds
during the first 60 - 120 miles (100 - 200 km).
Tires must always remain on the same side
of the vehicle.
When wheels are removed, the direction of
rotation and position of each wheel should be
marked.
If new tires are installed only on one axle, a
noticeable change in handling occurs due to the
different tread depth of the other tires. This
happens especially if only rear tires are replaced.
However, this condition disappears as the new
tires are broken in.
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Please adjust your driving style accordingly.
Installation of new tires should only be done by a
qualified tire technician.
Valves
Please observe the fitting and replacement
instructions:
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Only use genuine Porsche valves for the Tire
Pressure Monitoring (TPM).
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Check the TPM valves whenever the tires are
changed, and replace if necessary. We
recommend that you get a Porsche partner to
do this work as dealers have trained workshop
personnel and the necessary parts and tools.
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Protect valve inserts from soiling using valve
caps. Soiled valve inserts can cause a gradual
loss of air.
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Use only plastic valve caps.
Parking at the curb
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DANGER Curb impact / tire
damage
Hard impacts against curbs (or traffic islands) are
dangerous and may cause hidden tire damage
which is not noticeable until later. Such damage
can result in accidents at high speeds. Depending
on the force of impact, the edge of the rim can
also be damaged.
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After such an impact, have the wheel checked
by an expert.
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If you must drive over a curb or other obstacle,
drive slowly and at an obtuse angle.
Exercise care when parking along curbs.
Information
Tire repairs are not permissible under any
circumstances.
Wheel alignment, wheel balancing
As a precaution, have wheels with summer tires
balanced in the spring, and those with mud and
snow tires before winter. Unbalanced wheels may
affect car handling and tire life.
Only the specified weights may be used for wheel
balancing.
Self-adhesive weights must not come into contact
with cleaning agents, since they could drop off.
Uneven tread wear indicates wheel imbalance. In
this event, the vehicle should be checked at an
authorized Porsche dealer.
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High-speed tire vibration
DANGER
If, during a trip, uneven running or vibrations occur
that could be caused by damage to tires or the
car, the speed must be reduced immediately, but
without braking sharply. If you continue your trip
without having the cause of the fault remedied,
you might lose control of your vehicle.
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Stop the vehicle and check the tires.
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If no cause for the fault can be found, drive
carefully to the nearest authorized Porsche
dealer.
Minor Repairs
191