Porsche Cayman Owner's Manual page 231

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Snow tire use
WARNING
The standard tires profile and rubber mixture are
optimized for wet and dry driving conditions, and
may not prove favorable for snow conditions.
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Install snow tires before driving in such
conditions.
NOTICE
Risk of insufficient road grip leading to loss of
control and damage to the vehicle.
The standard tires profile and rubber mixture are
optimized for wet and dry driving conditions, and
may not prove favorable for snow conditions.
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Install snow tires before driving in such
conditions.
Before mounting snow tires, consult with your
Porsche dealer. They have the technical
information necessary to advise you on wheel and
tire compatibility.
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Snow tires should have the same load capacity
as original equipment tires and should be
mounted on all four wheels.
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DANGER Tire hazards
Driving the vehicle with low tire pressure increases
risk of a tire failure and resulting loss of control.
Furthermore, low tire pressure increases the rate
of wear of the affected tires and causes damage.
Tires with badly worn treads are very dangerous
and could cause accidents.
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Make sure they are replaced immediately.
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Do not exceed the snow tire speed rating.
Snow tires do not have the same degree of
traction on dry, wet or snowfree roads as normal
tires.
Furthermore, snow tires wear rapidly under these
conditions.
Information
We recommend that you fit snow tires on the
vehicle at temperatures below 45 °F (7 °C) since
the driving performance of summer tires is
reduced at low temperatures and a lower level of
comfort can also be expected. For example,
juddering noises caused by the tires can occur
while maneuvering the vehicle or accelerating out
of bends on both dry and wet road surfaces.
Extremely low temperatures of below 5 °F (-15 °C)
can cause permanent damage to summer tires.
Snow tires lose their suitability when their tread
depth falls below 5/32 in. (4 mm).
Comply with all state and local laws
governing snow tire and tread depth
requirements.
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Excessive speed for
DANGER
tires
Exceeding the maximum permitted speed for the
tires fitted could cause tire failure.
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Always check the maximum speed rating on
the tire sidewall on any tire on the vehicle.
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Never exceed the maximum speed rating of
the tires.
Wheel change
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When wheels are removed, mark the direction
of rotation and position of each wheel.
Example: FR (front right), FL, RR and RL.
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Always fit the wheels in accordance with the
markings.
Snow chains
NOTICE
Risk of damage to body, axle or brake
components.
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Fit snow chains only to the rear wheels, and
only with the tire/rim combination listed in the
Technical Data.
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Use only the fine-link snow chains
recommended and authorized by Porsche so
that sufficient clearance between the wheel
well and the chain is assured.
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Please see the chapter "WHEELS, TIRES"
on page 261.
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Follow instructions issued by the supplier of
the chains.
Minor Repairs
229