2005 PORSCHE 911 CARRERA tire size

Controls, Instruments
63
Operation of the ABS systemA wheel speed sensor is mounted to each of the
four wheels. If wheel lock-up of either of the front
wheels or the rear wheels is sensed during brak-
ing, the brake pressure is adjusted automatically
until the wheel no longer slips. The brake pressure
is regulated for each front wheel individually and
for both of the rear wheels together.
On a road surface which is slippery on only one
side, the rear wheel which is braking on the slip-
pery surface determines the brake pressure which
will be applied equally to both rear wheels. This en-
sures that directional stability is maintained. How-
ever, if braking forces approach the wheel lock-up
point for all wheels (panic braking) the ABS system
will intervene to provide a rapid rythmic braking.
The proper operation of ABS is perceived by the
driver as a pulsating brake pedal in conjunction
with audible noise and perhaps some vibration.
fIf you experience these sensations while driv-
ing or a road surface with questionable trac-
tion, reduce vehicle speed appropriate for the
prevailing road conditions.
The functional readiness of all the main electrical
components of the ABS is checked by an
electronic monitoring system both before and
while you drive. When the ignition is switched on the ABS warning
light will light up while the system is electronically
interrogated and goes out when the engine is
started if the check is not yet complete.
If the ABS warning lamp fails to go out, this indi-
cates that ABS has been deactivated due to a
fault. If the warning lights in the instrument panel
and on-board computer light up while you are driv-
ing, this indicates that a fault has occurred. In both
cases, normal braking, as in vehicles without ABS,
is still retained.
The ABS system should, however, be examined at
an authorized Porsche dealer immediately to pre-
vent the occurrence of further faults.
fIf the ABS system becomes inoperative, take
your vehicle to your authorized Porsche dealer
immediately.
Warning!
The control unit of the ABS brake system is
set for standard tire size. If non-standard
tires are installed, the control unit may mis-
interpret the speed of the vehicle, because of
the variant data it receives from the sensors
on the axles.
fUse only tire makes and types tested by Porsche.
Warning light USA
Warning light Canada

Practical Tips, Emergency Service
213
Example of a tire pressure plate ATire pressure plateDepending on when your vehicle was manufac-
tured, the tire pressure plate on the driver's door
aperture will contain different data.
Information on the tire pressure plate A
A Seating capacity
Maximum number of vehicle occupants, includ-
ing the driver.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.
If a trailer is being towed, the trailer tongue
weight must be included as part of the cargo
load.
Please observe the chapter “LOADING INFOR-
MATION” on Page 222.
C Tire size for the front axle
Check with your authorized Porsche dealer
about the current release status.
D Recommended tire pressure 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
Example of a tire pressure plate BInformation on the tire pressure plate B
A Information for tire sealant, seating capacity,
vehicle load limit
B Approved tire size for the front axle
C Permissible tire pressure for the front axle
D Tire pressure for fully loaded or partially
loaded vehicle
E Permissible tire pressure for the rear axle
F Approved tire size for the rear axle

220
Practical Tips, Emergency Service
Example of InscriptionInscription on radial tireATire size
Example: P 295/30 ZR 19 100 Y
–P - The tire is designed for Passenger vehicle.
This information is not included on all tires.
–295 - Indication of tire width in mm
–30 - Indication of tire height to tire width ratio
in percent–ZR - code letter for radial tires for speeds
above 150 mph / 240 km/h
There are currently no standards concerning
tire strength at speeds above 150 mph
(240 km/h).
–R - Belt type code letter for radial
–19 - Indication of rim diameter in inches
–100 - Load capacity coefficient
–Y - Speed code letter
–XL (Extra Load) - Tire with increased load rat-
ing
B TIN (Tire Identification Number)
Example: DOT xx xx xxxx xxxx
–DOT
The DOT symbol indicates that the tires com-
ply with the requirements of the US Depart-
ment of Transportation and provides informa-
tion about:
– first two-digit code means manufacture’s iden-
tification mark.
– second two-digit code means tire size.
– third four-digit code means tire type code.
– fourth four-digit code means date of manufac-
ture.
If, for example, the last four numbers read
0204, the tire was produced in the 2nd week
of 2004.
C Tire ply composition and material
The number of layers in the tread and sidewalls
and their material composition.
D Maximum permissible inflation pressure
The maximum permissible cold inflation pressure
to which a tire can be inflated.
fDo not exceed the permissible inflation pres-
sure.

266
Technical Data
Tires, Rims, Tracks
Tire 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 10 J x 18 H2 58 mm 60.4 in./1534 mm
or front 235/35 ZR 19 (87Y) 8 J x 19 H2 57 mm 58.5 in./1486 mm
rear 295/30 ZR 19 (100Y) XL 11 J x 19 H2 67 mm 59.7 in./1516 mm
Snow tiresfront 235/40 R 18 91V M+S 8 J x 18 H2 57 mm 58.5 in./1486 mm
rear 265/40 R 18 97V M+S** 10 J x 18 H2 58 mm 60.4 in./1534 mm
or front 235/35 R 19 87V M+S 8 J x 19 H2 57 mm 58.5 in./1486 mm
rear 295/30 R 19 100V XL M+S 11 J x 19 H2 67 mm 59.7 in./1516 mm
The load capacity coefficient (e.g. “91”) and maximum speed code letter (e.g. “Y”) are minimum requirements.
Danger!
Installation of sizes not authorized by
Porsche may have a dangerous effect on
the driving stability and could result in
severe personal injury or death.
fBefore mounting new tires, check with your
Porsche dealer about the current release status.
* 911 Carrera S: Summer tires 19-inch only

Technical Data
267
Tire Pressures for cold tiresSummer and winter tires
These tire filling pressures apply only to the tire makes and types approved by Porsche.
fPlease observe the chapter “TIRES/WHEELS” on Page 209. Tire and rim sizesExtensive tests are performed before specific tires and wheels are approved by Porsche. Your Porsche dealer has infor-
mation 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 stand behind the
safety or durability of these aftermarket combinations.
Snow chainsCan 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 on the tire + rim combination marked**.
18 inch wheels front 36 psi (2.5 bar)
rear 44 psi (3.0 bar)
19 inch wheels, partially loaded front 33 psi (2.3 bar)
(up to 2 persons without luggage) rear 39 psi (2.7 bar)
19 inch wheels, fully loaded front 36 psi (2.5 bar)
(as of 2 persons with luggage) rear 44 psi (3.0 bar)

282
Index
TTachometer .................................................. 83
Tank ......................................... 188
, 189
, 268
Ventilation system ............................... 193
Technical data ............................................ 264
Telephone .................................................. 142
Temperature setting .................................... 120
Temperature, outside indicator....................... 87
Test stand, measurements ............................ 67
Theft protection ............................................ 18
Tiptronic .................................................... 145
Indicator............................................... 85
Tires ........................................... 16
, 209
, 266
Care .................................................. 209
Checking pressure .............................. 229
Inscription .......................................... 220
Loading information............................ 222
Pressure ............................... 5
, 212
, 267
Pressure plate .................................... 263
Sealant ......................................225, 226
Sidewall ............................................. 220
Size ................................................... 220
Tools ......................................................... 132
Towing ...................................... 150
, 259
, 260
Tow-starting ............................................... 150
Tracks ....................................................... 266
Transmission ......................................144, 265
Fluid...........................................195, 268
Trunk entrapment ....................................... 133
Turn signals..........................................83, 114
UUndercoating ......................................191
, 203
VValves ........................................................ 216
Vanity mirror ................................................. 41
Vehicle
Care .................................................. 198
Data................................................... 262
Identification label ............................... 262
Identification number ........................... 262
Putting into operation .......................... 239
Washing ............................................. 199
Ventilation .................................................. 120
Vents ................................................ 120
, 123
Viscosity, engine oil..................................... 184
WWarning lights and messages....................... 105
Washer
Fluid .......................................... 193
, 268
Lever ................................................. 115
Washing ..................................................... 199
Weights ...................................................... 269
Welcome Home Function ............................. 113
Wheel.................................. 16
, 204
, 209
, 266
Bolts .................................................. 228
Care .................................................. 209
Changing ............................................ 225
Checking pressure.............................. 229
Inscription .......................................... 220
Loading information............................. 222
Securing wheel bolts ............................. 19
Sidewall.............................................. 220
Size ................................................... 220
Tire pressure ......................... 5
, 212
, 267Tire pressure plate..............................263
Tire sealant................................ 225
, 226
Windows...................................... 28
, 156
, 203
Washer nozzles ...................................115
Washer system .................. 115
, 193
, 268
Windshield wiper/washer lever .....................115
Windshield wipers .............................. 115, 196
Replacing ...........................................196
Windstop ....................................................165
Winter operation
Battery ...............................................238
Coolant ..............................................179
Engine oil............................................180
Jumper cables ........................... 242, 243
Locks .................................................201
Seals..................................................204
Snow chains .......................................219
Tires ......................................... 218, 266
Washer fluid ........................................193
Wiper blades .......................................196
Wiper
Blades ................................................196
Rear ...................................................116