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282
they have trained technicians and the neces-
sary parts and tools.
e
Adjust your driving style to the altered handling
behavior.
e
Only use tires with tire pressure sensors for the
Tire Pressure Monitoring System (TPMS).
e
Make sure the wheels are compatible with the
TPMS on your vehicle. For information on suit-
able wheels and on the TPMS on your vehicle:
Contact an authorized Porsche dealer.
e
Check the battery level of the tire pressure
sensors when changing tires. Visit an author-
ized Porsche dealer. Porsche recommends an
authorized Porsche dealer, as they have
trained technicians and the necessary parts
and tools.
Information
If new tires are installed only on one axle, a notice-
able change in handling occurs due to the different
tread depth of the other tires. This is especially the
case if only the rear tires are replaced. However,
this effect is reduced continuously as the new tires
are broken in.
Check and replace valves and valve
caps
e
Use only genuine Porsche valves for the Tire
Pressure Monitoring System (TPMS).
e
Have the valves checked and replaced if nec-
essary whenever the tires are changed. Por-
sche recommends an authorized Porsche
dealer, as they have trained technicians and the
necessary parts and tools.
In the absence of valve caps the valve is unpro-
tected from dust and dirt, resulting in leaks.
e
Always screw on valve caps tightly to protect
valve inserts from dirt. Dirty valve inserts can
cause creeping air loss.
e
Replace missing valve caps immediately.
e
Use only plastic valve caps.
Using snow tires
WARNING
Exceeding the maxi-
mum permitted speed
Exceeding the maximum permitted speed may
cause tires to burst.
e
Observe the maximum permitted speed for the
tires.
e
Snow tires with a lower maximum permitted
speed than the specified maximum speed of
the vehicle may only be installed if they bear the
M+S designation on the tire sidewall. All-sea-
son and all-terrain tires also have maximum
speed ratings and bear this designation.
e
Affix the sticker with the maximum permitted
speed in the driver's field of vision. Observe
country-specific regulations.
e
Set the maximum permitted speed as the
speed limit.
e
Install snow tires in a timely manner before the
cold season begins.
e
Use only tire makes tested and approved by
Porsche.
e
Before mounting new tires, inquire about their
current approval status: Contact an authorized
Porsche dealer.
Information
At low temperatures, juddering noises caused by
the tires can occur during maneuvering or accel-
erating out of curves on both dry and wet road
surfaces.
The driving performance and comfort of summer
tires is reduced at low temperatures below 45 °F
(7 °C). Porsche therefore recommends that you fit
snow tires on the vehicle when temperatures are
below 45 °F (7 °C).
Extremely low temperatures below 5 °F (-15 °C)
can cause permanent damage to summer tires.
Snow tires are no longer suitable if their tread
depth is less than 0.16 in. (4 mm).
Using snow chains
Install snow chains only on the rear wheels and on-
ly with the tire/rim combinations designated for
use with snow chains listed in the Technical Data.
e
Only use snow chains approved by Porsche so
that sufficient clearance between the wheel
well and chain is assured.
e
Activate snow chain mode on vehicles with rear
axle steering.
>
Please see chapter "Vehicle settings" on
page 248.
e
Remove ice and snow deposits in the wheel
well before installing the chains.
e
Observe the different national regulations re-
garding maximum speeds.
Checking tire tread
e
The treadwear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a specific gov-
ernment test course. For example, a tire
