2010 PORSCHE CAYMAN wheel size

Operation, Safety
45
fUsing accessories not approved by Porsche
can cause the weight sensing system to be im-
paired.
f Do not squeeze objects, such as the fire extin-
guisher, or first aid kit under the seat.
f Only have seats removed and installed by an
authorized Porsche dealer so that weight sens-
ing components will not be damaged.
f Give your passenger all of the information in
this chapter.
Note
Airbag components (e.g. steering wheel, door lin-
ing, seats) may be disassembled only by an autho-
rized Porsche dealer.
When disposing of a used airbag unit, our safety
instructions must be followed. These instructions
can be obtained at any authorized Porsche dealer.
Function of the airbag systemAirbags are a supplemental safety system. Your
primary protection comes from your safety belts.
The front airbags are triggered during a frontal
collision of sufficient force and direction.
In the event of a side impact of corresponding
force, the side airbag on the impact side is
triggered.
The inflation process gene rates the amount of gas
required to fill the airbags at the necessary pres-
sure in fractions of a second.
Airbags help to protect the head and upper body,
while simultaneously damp ing the motion of the
driver and passenger in the impact direction in the
event of a frontal impact or side impact.
In order to help provide protection in severe colli-
sions which can cause death and serious injury,
airbags must inflate extremely rapidly. Such high
speed inflation has a negative but unavoidable
side effect, which is that it can and does cause in-
juries, including facial an d arm abrasions, bruising
and broken bones. You can help minimize such in-
juries by always wear ing your safety belts.
There are many types of accidents in which air-
bags are not expected to deploy. These include
accidents where the airbags would provide no be-
nefit, such as a rear impact against your vehicle.
Other accidents where the airbags are designed
not to deploy are those where the risk of injury
from the airbag deployment could exceed any pro-
tective benefits, such as in low speed accidents or higher speed accidents where the vehicle decele-
rates over a long time. Since airbag deployment
does not occur in all accidents, this further em-
phasizes the need for yo
u and your passenger to
always wear safety belts.
Your vehicle is equipped with a crash sensing and
diagnostic module. This module will record the
use of the seat belt restraint system by the driver
and passenger when the airbags and/or belt ten-
sioner work.
Advanced AirbagYour vehicle is equipped with a weight sensing sys-
tem for the passenger's seat in accordance with
U.S. Federal Motor Vehicle Safety Standard 208.
Depending on the weight acting on the passen-
ger's seat, the passenger's airbag will automati-
cally be switched on and off.
Depending on the angle and force of impact, the
passenger's airbag which is activated will be trig-
gered during a collision.
Precondition for switching the passenger's airbag
on and off, depending on weight:
– Vehicles equipped with key-operated airbag deactivation device:
Switch position AUTO.
– Ignition key is inserted.
Improper handling of the weight sensing
system can unintentional ly impair switching
the passenger's airbag off and on.

Instruments, On-Board Computer, Warnings
151
TPM
Tire Pressure MonitoringfPlease see the chapter “TIRE PRESSURE FOR
COLD TIRES (68 °F/ 20 °C)” on Page 267.
The Tire Pressure Monitoring continuously
monitors tire pressure and tire temperature on all
four wheels and warns the driver when the tire
pressure is too low.
The display as well as the settings for the Tire
Pressure Monitoring take place on the on-board
computer.
However, you must still adjust the tire pressure on
the wheel. f
The driver is responsible for filling the tires
correctly and making the correct settings on
the on-board computer.
The Tire Pressure Monitoring offers the following
functions:
– Display of the actual ti re pressure while the
vehicle is in motion.
– Display of the deviation from the required pressure (refilling pressure).
– Display of currently set tire size and type.
– Tire pressure warnings in two stages.
Warning!
f Despite the advantages offered by the Tire
Pressure Monitoring, it is still the driver’s re-
sponsibility to update the corresponding set-
tings in the on-board computer and maintain
the pressure in the tires.
Low tire pressure reduces the road safety of
the vehicle and destroys the tire and wheel.
f When a flat tire has been displayed, immedi-
ately stop in a suitable place and check the
tires for damage. If necessary, remedy the
damage with a tire sealant.
f Do not by any means continue to drive with
damaged tires.
f Sealing the tire with tire sealant is only an
emergency repair, so you can drive to the next
authorized Porsche dealer. The maximum per-
mitted speed is 50 mph (80 km/h). f
Do not drive with tires whose tire pressure
drops again in a short period of time. In cases
of doubt, have tires checked by an authorized
Porsche dealer.
f Damaged tires must be immediately replaced
by an authorized Porsche dealer.
Tire repairs are not permissible under any
circumstances.
f If a fault occurs in the Tire Pressure Monitoring
(e.g. defective wheel tr ansmitter), contact an
authorized Porsche dealer immediately and
have the damage repaired.
The tire pressure will not be monitored at all or
will be monitored only partially by defective
Tire Pressure Monitoring.
f Tires lose air over time without a tire defect
being present. A tire pressure warning will then
appear in the on-board computer display.
Correct the tire pressure at the next oppor-
tunity.
f The Tire Pressure Monitoring gives a warning
about tire damage due to natural pressure loss
as well as about a gradual loss of pressure due
to foreign objects.
The Tire Pressure Mnitoring cannot warn you
about tire damage that occurs suddenly (e.g.
flat tire due to abrupt external effects).

Instruments, On-Board Computer, Warnings
153
The tire pressure to be corrected (refill pressure)
is indicated on the displayed wheel.
Example: If “ –1.5 psi (–0.1 bar)” is displayed,
1.5 psi (0.1 bar) must be added to this tire.
Note
The tire pressure menu can only be called up when
the vehicle is stationary.
Calling up the “Info pressure” display
fPush operating lever forward in order to switch
on the selection field.
f Select “TPM” with the operating lever.
f Push operating lever forward.
The display changes to the tire pressure menu.
f Select “Info pressure” with the operating lever.
f Push operating lever forward.
Note
After the ignition is switch ed on, it can take up to
approx. 1 minute before all tire pressures are
displayed. Dashes (“-.-”) appear instead of the tire
pressures. Tire type info in Tire pressure menu
Information about the currently set tires:
– Tire type: Summer tires, winter tires
– Tire size: 17, 18, 19 inch
“Info tires” shows the current tire settings.
Calling up the “Info tires” display
f
Push operating lever forward in order to switch
on the selection field.
f Select “TPM” with the operating lever.
f Push operating lever forward.
The display changes to the tire pressure menu. f
Select “Info tires” with the operating lever.
f Push operating lever forward.
Tire selection in the “Set” menu
f Push operating lever forward in order to switch
on the selection field.
f Select “TPM” with the operating lever.

156
Instruments, On-Board Computer, Warnings
The tire selection has only been successfully
completed when the message “Process
complete” is displayed by the on-board computer.
f
Select arrow (Back) and push the operating
lever forward. The display returns to the tire
pressure menu.
The on-board computer additionally displays
the message “System learning”. Note
The message “Process aborted” appears if the
setting process is interrupted. All entries made up
to this point are lost, and the original settings
remain in effect.
Only if the message “Process complete” appears
after the settings have been made will the Tire
Pressure Monitoring re-learn the wheels.
f
Please see the chapter “SYSTEM LEARNING”
on Page 158.
Before fitting tires with sizes which are not stored
in the on-board computer, the missing information
should be supplemented in the on-board
computer.
f Please consult your authorized Porsche
dealer.
f Use only tires approved by Porsche.
The available items in the tire pressure menu
depend on the equipment of your vehicle. For this
reason it is possible that some of the items shown
here are not available on your on-board
computer’s display.
f Make sure that tire pressures correspond to
the on-board computer settings. Correct the
tire pressure if necessary.
f Please see the chapter “TIRE PRESSURE FOR
COLD TIRES (68 °F/ 20 °C)” on Page 267. Tire pressure warnings
The tire pressure warning light on the instrument
panel and a corresponding message on the on-
board computer warn about loss of pressure in
two stages, depending on the amount of pressure
loss.
Driving with insufficient tire pressure reduces the
road safety of the vehicle
and destroys the tire and
wheel.
Stage 1 – Add air
The pressure in the tire is too low by 4 to 7 psi (0.3
to 0.5 bar).
f The tire pressure warning contains the
affected tire with the tire pressure to be added.
Correct the tire pressure at the next
opportunity.

216
Practical Tips, Emergency Service
B Vehicle load limit
Is the maximum total weight limit specified of
the load (passengers and cargo) for the vehi-
cle. This is the maximum weight of passengers
and cargo that can be loaded into the vehicle.
Please see the chapter “LOADING INFORMA-
TION” on Page 224.
C Tire size for the front axle Check with your authorized Porsche dealer
about the current release status.
D Recommended tire pre ssure for the front axle
These values are for cold tires (68 °F/20 °C).
E Tire size for the rear axle Check with your authorized Porsche dealer
about the current release status.
F Recommended tire pressure for the rear axle. These values are for cold tires (68 °F/20 °C).
G In vehicles with collapsible spare wheel: Size and tire pressure of the spare wheel.
Tire traction
Warning!
When driving on wet or slushy roads, a
wedge of water may build up between the
tires and the road. This phenomenon is
known as “hydroplane” and may cause par-
tial or complete loss of traction, vehicle
control or stopping ability.
f Reduce speed on wet surface to prevent this. Tire life Tire life depends on vari ous factors, i. e., road
surfaces, traffic and wea ther conditions, driving
habits, type of tires and tire care.
f Inspect your tires for wear and damage before
driving off. If you notice uneven or substantial
wear, wheels might need alignment or tires
should be balanced or replaced.
Tire wear The original equipment tires on your Porsche have
built-in tire wear indicato rs. They are molded into
the bottom of the tread grooves and will appear as
approximately 1/2 in. (12 mm) bands when the
tire tread depth is down to 1/16 of an in.
(1.6 mm).
When the indicators appear in two or more adja-
cent grooves, it is time to replace the tires. We
recommend, however, that you do not let the tires
wear down to this extent.
Worn tires cannot grip the road surface properly
and are even less effective on wet roads.
Snow tires lose their traction capability when their
tread depth falls below 5/32 in. (4 mm).
In the United States, state laws may govern the
minimum tread depth permissible. Follow all such
laws.

Technical Data
269
fWhen changing tires or fitting new ones: Please see the chapter “WHEEL BOLTS” on Page 226.
Danger!
Installation of sizes not authorized by
Porsche may have a dangerous effect on
the driving stability and could result in
serious personal injury or death.
f Before mounting new tires, check with yourPorsche dealer about the current release status.
Cayman S Tires Rim Rim offset Track
Summer tires
front 235/40 ZR 18 91Y 8 J x 18 H2 57 mm 58.5 in./1486 mm
rear 265/40 ZR 18 101Y XL 9 J x 18 H2 43 mm 60.2 in./1528 mm
or front 235/35 ZR 19 87Y 8 J x 19 H2 57 mm 58.5 in./1486 mm
rear 265/35 ZR 19 94Y 9.5 J x 19 H2 46 mm 59.9 in./1522 mm
or front 235/35 ZR 19 87Y 8.5 J x 19 H2 55 mm 58.7 in./1490 mm
rear 265/35 ZR 19 94Y 10 J x 19 H2 42 mm 60.2 in./1530 mm
Snow tires front235/40 R 18 91V M+S 8 J x 18 H2 57 mm 58.5 in./1486 mm
rear * 255/40 R 18 95V M+S 9 J x 18 H2 43 mm 60.2 in./1528 mm
The load capacity coefficient (e.g. ”91“) and maximum sp eed code letter (e.g. ”Y“) are minimum requirements.
Tire and rim sizes Extensive tests are performed before specific tires and wheels are approved by Porsche. Your Porsche dealer has information
about approved tires and wheels and is happy to assist you. If aftermarket tires and/or wheels are installed which are not
approved by Porsche, the vehicle’s roadability and handling characteristics might be impaired. Since Porsche has no data on
such combinations, Porsche cannot st and behind the safety or durability of these aftermarket combinations.
Snow chains Can be mounted only on the rear wheels; maximum speed 30 mph/50 km/h. Use only Porsche authorized fine-link
cross-type or edge chains. Snow chain clearance can be guaranteed only with the tire + rim combination marked*
without spacers. Please see the chapter “SPACERS” on Page 233.

Index
281
Checking pressure .............................. 228
Inscription .......................................... 222
Loading information ............................ 224
New tires ............... .............................. 10
Pressure .................... ................ 214, 270
Pressure monitoring ............................ 151
Pressure plate ........ ............................ 265
Removing and storing.......................... 219
Sealant ...................... ................ 229, 230
Sidewall ..................... ........................ 222
Size ................................................... 222
Snow tires .............. ............................ 220
Tools ................ ........................................... 94
Towing ........................... .................... 259, 261
Towing hook............... ................................ 259
TPM Tire pressure moni toring ...................... 151
Track ............................. ............................ 268
Transmission Drive-Off Assistant... ............................ 176
Fluid........................... ................ 201, 271
Manual transmission ............................ 176
Porsche Doppelkupplung (PDK) .... 176, 178
Trip Odometer ............ ................................ 125
Trunk entrapment ....... ................................ 100
Turn signal Indicator light.......... ............................ 127
Turn signal light, front Changing bulb......... ............................ 253
Turn signals ......................................... 81, 127
UUndercoating ................ ......................198, 206VValves ........................................................218
Vanity mirror............. ....................................41
Vehicle Care......................... ..........................203
Engine number....................................265
Identification ......... ..............................264
Identification labe l ...............................264
Identification numbe r ...........................264
Lifting................... ..............................232
Load capacity ....... ..............................225
Putting into operat ion ..........................241
Safety compliance st icker ....................264
Washing ................... ..........................204
Vehicle identification number ........................264
Ventilation .................... ..............................113
Vents ................... ......................110, 113, 116
Viscosity, engine oil .....................................191
Voice control, button . ..................................134
Voice control, PCM ... ..................................134
WWarning lights and me ssages ...................... 166
Washer
Fluid ........................ .......................... 200
Fluid warning light. .............................. 200
Washer fluid ................................. .............. 271
Washer lever................................ ................ 82
Washing ...................... .............................. 204
Weights ........................................... .......... 272
Welcome Home Function ........................ 79, 80
Wheel ................. ................. 10, 213, 268, 269
Alignment ................ .......................... 219
Balancing........................................... 219
Bolts ....................... .......................... 226
Care ........................ .......................... 213
Changing ................. .......................... 229
Checking pressure ............................. 228
Inscription ............ .............................. 222
Loading information . ........................... 224
Securing bolts...... .............................. 226
Security wheel bolts ............................. 15
Sidewall ................... .......................... 222
Size .................................................. 222
Tire pressure ....... .............................. 214
Tire pressure plate ............... .............. 265
Tire sealant .............. .................. 229, 230
Wheels
Assembly aids for wheel changes ........ 227
Care ........................ .......................... 207
TPM sensors............ .......................... 219
Windows...................... .............................. 206
Anti-crushing protection ........................ 28
Care ........................ .......................... 206
Opening/Closing ...................... ............ 27