Porsche 911 2020 Owner's Manual page 310

Wheels and Tires
A
current approval status: Contact an authorized
Porsche dealer.
B
e Use only tire makes tested and approved by
C
Porsche.
e The difference in tread depths on one axle must
D
not exceed 30%.
e Only use second-hand tires if their prior usage is
E
known.
F
e Always replace both tires on one axle to avoid
G
any unnecessary effect on driving behavior due
to varying tread depths.
H
e Only authorized Porsche dealers may mount
I
tires. Visit an authorized Porsche dealer. Porsche
recommends an authorized Porsche dealer, as
J
they have trained technicians and the necessary
K
parts and tools.
e Adjust your driving style to the altered handling
L
behavior.
e Only use tires with tire pressure sensors for the
M
Tire Pressure Monitoring System (TPMS).
N
e Make sure the wheels are compatible with the
O
TPMS on your vehicle. For information on suit-
able wheels and on the TPMS on your vehicle:
P
Contact an authorized Porsche dealer.
e Check the battery level of the tire pressure sen-
Q
sors when changing tires. Visit an authorized
R
Porsche dealer. Porsche recommends an author-
S
ized Porsche dealer, as they have trained techni-
cians and the necessary parts and tools.
T
> Please see chapter "Technical Data" on
U
page 327.
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W
X
Y
Z
308
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.
Checking and replacing 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 neces-
sary whenever the tires are changed. Porsche
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 unprotected
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
Exceeding the maximum
WARNING
permitted speed
Exceeding the maximum permitted speed can cause
tires to burst.
e Observe the maximum permitted speed for the
tire.
e Snow tires with a maximum permitted speed
rating that is lower than the specified maximum
vehicle speed may only be fitted if they bear the
M+S designation or the snowflake symbol, de-
pending on the country, on the tire sidewall. Ob-
serve country-specific regulations.
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 accelerating
out of curves on both dry and wet road surfaces.
The driving performance and comfort of summer
tires are impaired at low temperatures below 45 °F/
7 °C. Porsche therefore recommends that you fit
snow tires on the vehicle at temperatures 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 only
with the tire/rim combinations designated for use
with snow chains listed in the Technical Data.