2014 AUDI A8 wheel size

158 Airbag system
that deployment under these special
conditions is impossible in all conceiva­
ble situations that may happen during
the useful life of your vehicle .
- The Advanced Airbag System can deploy
in accordance with the "low risk" option
under the U.S . Federal Standard if a child
that is heavier than the typical one-year old child is on the front passenger seat
and the other conditions for airbag de­
ployment are met .
- Accident statistics have shown that chil­
dren are generally safer in the rear seat
area than in the front seating position.
- For their own safety, all children, espe­
cially 12 years and younger, should al­
ways ride in the back properly restrained
for their age and size.
Advanced front airbag system
Your vehicle is equipped with a front Advanced
Airbag System in compliance with United
States Federal Motor Vehicle Safety Standard
208 as applicable at the time your vehicle was manufactured .
The front Advanced Airbag System supple­ ments the safety belts to provide additional
protection for the driver's and front passeng­
er's heads and upper bodies in frontal crashes .
The airbags inflate only in frontal impacts
when the vehicle deceleration is high enough.
The front Advanced Airbag System for the
front seat occupants is not a substitute for
your safety belts . Rather, it is part of the over­
all occupant restraint system in your vehicle .
Always remember that the airbag system can
only help to protect you , if you are sitting up­
right, wearing your safety belt and wearing it
properly. This is why you and your passengers
must always be properly restrained, not just
because the law requires you to be.
The Advanced Airbag System in your vehicle has been certified to meet the "low risk" re­
quirements for 3 and 6 year-old children on
the passenger side and very small adults on
the driver side. The low risk deployment crite- ria
are intended to help reduce the risk of in­
jury through interaction with the front airbag that can occur, for example, by being too
close to the steering wheel and instrument
panel when the airbag inflates.
In addition, the system has been certified to
comply with the "suppression" requirements
of the Safety Standard, to turn off the front
airbag for infants 12 months old and younger
who are restrained on the front passenger
seat in child restraints that are listed in the
Standard
¢ page 179, Child restraints and
Advanced Airbags .
"Suppression" requires the front airbag on the
passenger side to be turned off if:
- a child up to about one year of age is re­ strained on the front passenger seat in one
of the rear -facing or forward-facing infant
restraints listed in Federal Motor Vehicle
Safety Standard 208 with which the Ad­
vanced Airbag System in your vehicle was
certified . For a listing of the child restraints
that were used to certify your vehicle's com­
pliance with the US Safety Standard
¢page 179,
-weight less than a threshold level stored in
the control unit is detected on the front pas­
senger seat.
When a person is detected on the front pas­ senger seat, weighing more than the total
weight of a child that is about 1 year old re­
strained in one of the rear-facing or forward­
facing infant restraints (listed in Federal Mo­
tor Vehicle Safety Standard 208 with which
the Advanced Airbag System in your vehicle
was certified), the front airbag on the passen­
ger side may or may not deploy.
The
PASSENGER AIR BAG OFF light comes on
when the electronic control unit detects a to­
tal weight on the front passenger seat that re­
quires the front airbag to be turned off. If the
PASSENGER AIR BAG OFF light does not
come on, the front airbag on the passenger
side has not been turned off by the control
unit and can deploy if the control unit senses ..,_

178 Child Safety
-Always install rear-facing child safety
seats on the rear seat.
- If you must install a rearward facing
child safety seat on the front passenger
seat in exceptional circumstances and
the
PASSENGER AIR BAG OFF light does
not come on and stay on, immediately
install the rear-facing child safety seat in
a rear seating position and have the air­
bag system inspected immediately by
your Audi dealer.
_& WARNING
If, in exceptional circumstances, you must
install a forward-facing child restraint on
the front passenger's seat:
- Always make sure the forward-facing
seat has been designed and certified by
its manufacturer for use on a front seat
with a passenger front and side airbag.
- Always follow the manufacturer's in­
structions provided with the child safety
seat or carrier.
- Always move the passenger seat into its
rearmost position in the seat's fore and
aft adjustment range, as far away from
the airbag as possible before installing
the child restraint. The backrest must be
adjusted to an upright position .
- Always make sure that the
PASSENGER
AIR BAG OFF
light comes on and stays
on all the time whenever the ignition is
switched on.
(D Tips
Always replace child restraints that were
installed in a vehicle during a crash. Dam­
age to a child restraint that is not visible
could cause it to fail in another collision
situation.
Advanced front airbag system and children
Your vehicle is equipped with a front "Ad­
vanced Airbag System" in compliance with United States Federal Motor Vehicle Safety Standard (FMVSS) 208 as applicable at the
time your vehicle was manufactured.
The Advanced Airbag system in your vehicle
has been certified to meet the "low-risk" re­
quirements for 3- and 6-year old children on
the passenger side and small adults on th e
driver side. The low ris k deployment criteria
are intended to reduce the risk of injury
through interact ion with the airbag t hat can
occur, for example, by being too close to the
steering wheel and instrument panel when
the airbag inflates . In addition, the system
has been certified to comply with the "sup­
pression" requirements of the Safety Stand­
ard, to turn off the front airbag for infants up
to 12 months who are restrained on the front
passenger seat in child restraints that are list­
ed in the Standard.
Even though your vehicle is equipped with an
Advanced Airbag system , all children, espe­
cially those 12 years and younger, should al­
ways ride in the back seat properly restrained
for their age and size. The airbag on the pas­
senger side makes the front seat a potentially
dangerous place for a child to ride . The front
seat is not the safest place for a child in a for­
ward-facing child safety seat. It can be a very
dangerous place for an infant or a larger child
in a rearward-facing seat .
Advanced Airbags and the weight­
sensing mat in the front seat
The Advanced Airbag System in your vehicle
detects the presence of an infant or child in a
child restraint on the front passenger seat us­
ing the weight-sensing mat in the seat cush ­
ion and the sensor below the safety belt latch
on the front passenger seat that measures the
tension on the safety belt.
The weight -sensing mat measures total
weight of the child and the child safety seat
and a child blanket on the front passenger
seat. The weight on the front passenger seat
is related to the design of the child restraint
and its "footprint", the size and shape of the
bottom of the child restraint as it sits on the .,..

204 Intelligent technology
The correct f luid leve l in the reservoi r is
important for proper functioning of the
power steer ing.
Driving with your
quattro
With All Wheel Drive, all four wheels are driv­
en.
General information
With All Wheel Drive, power is distributed to
all four wheels . This happens automatically
depending on your dr iving style and the road
conditions at the t ime . See a lso
c::;, page 199.
W ith the sport differential*, power distribu­
tion to the rear wheels is var iable and can be
ad justed with Aud i drive select*
c::;,page 110.
Always read and fo llow safety precautions
¢ &, .
Winter tires
When driv ing in the w inter, your vehicle w ith
A ll Wheel Drive has an advantage, even with
r egular tires. In winter road conditions it may
be advisable to mount winter tires (or all-sea­
son tires) for improved driveability and brak­ ing: these tires must be mounted on all four
wheels. See also c:;, page 263, Winter tires.
Snow chains
Where snow chains are mandatory on certain
roads, this normally a lso applies to vehicles
with A ll Wheel Drive
¢ page 264, Snow
chains.
Replacing wheels/tires
Vehicles with A ll Wheel Dr ive must always
have tires of the same size . Also avoid ti res
with different tread depths. For details see
page
c:;, page 2 59, New tires and replacing
tires and wheels.
Off-Road driving?
Your Aud i does not have enough ground clear­
ance to be used as an off -road vehicle. It is
therefore best to avoid rough tracks and un ­
even terrain as much as possible. Also refer to
c::;, page209.
A WARNING
Always adjust your driving to road and traf­
f ic conditions. Do not let the extra safety
afforded by All Wheel Drive tempt you into
taking extra risks.
- Although the All Wheel Drive is very ef­
fective, always remember that braking
capacity is lim ited by tire traction. You
should therefore not drive at excessive
speeds on icy or slippery road surfaces.
- On wet road surfaces, be careful not to
drive too fast because the front wheels
could begin to slide on top of the water
(aquaplaning) . If this should occur, you
will have no warning from a sudden in­
crease in eng ine speed as with a front­
wheel drive vehicle. Always drive at speeds which are suited to the road con­
ditions - risk of crash.
Energy management
Starting ability is optimized
Energy management controls the distribution
of electrical energy and thus optimizes the
availability of electrical energy for starting
the engine .
If
a vehicle with a conventiona l ene rgy system
is not driven for a long period of time, the bat­
tery is discharged by idling current consumers
(e .g . immobilizer). In certain circumstances it
can resu lt in there being insufficient energy
available to start the engine .
Intelligent energy management in your vehi­
cle handles the distribution of e lectrica l ener­
gy. Starting ability is markedly improved and
the life of the battery is extended.
Basically, energy management consists of
battery diagnosis , idling current manage­
ment
and dynamic energy management.
Battery diagnosis
Battery diagnosis continuously determines
the state of the battery. Sensors determine
battery voltage, battery current and battery ..,.

250 Tires and wheels
Groove
means the space between two adjacent tread
ribs .
Load rating (code)
means the maximum load that a tire is rated
to carry for a given inflation pressure. You
may not find this informat ion on all tires be­
cause it is not req uired by law.
Maximum load rating
means the load rating for a t ire at the max i­
mum permissible inflation pressure for that
tire.
Maximum loaded vehicle weight
means the sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity we ight, and
(d) Production options weight
Maximum (permissible) inflation pressure
means the maximum cold inflation pressure
to which a tire may be inflated. Also called
"maximum inflation pressure ."
Normal occupant weight
means 150 lbs. (68 kilograms) times the
number of occupants seated in the vehicle up
to the total seating capacity of your vehicle .
Occupant distribution
means distribution of occupants in a vehicle.
Outer diameter
means the overa ll diameter of an inflated new
tire.
Overall width
means the linear distance between the exteri­
ors of the sidewalls of an inflated tire, includ­
ing elevations due to labeling, decorations, or
protective bands o r ribs .
Ply
means a layer of rubber-coated parallel cords.
Production options weight
means the combined weight of those insta lled
regular production options weighing over 5
lbs. (2.3 kg) in excess of those standard items
which they replace, not previously considered
in curb weight or accessory we ight, including
heavy duty brakes, ride levelers, roof rack,
heavy duty battery, and special tr im .
Radial ply tire
means a pneumat ic tire in which the ply cords
that extend to the beads are laid at substan­
t ia lly 90 degrees to the center line of the
tread .
Recommended inflation pressure
see<=> page 249, Cold tire inflation pressure.
Reinforced tire
means a t ire design to operate at higher loads
and at h igher inflation pressures than the cor­
responding standa rd tire. Reinforced tires
may be identified as "XL" "xl" "EXTRA LOAD"
' ' '
or "RF" on the sidewa ll.
Rim
means a metal support for a tire or a tire and
tube assembly upon which the tire beads are
seated.
Rim diameter
means nom inal diameter of the bead seat. If
you change your wheel s ize, you will have to
purchase new tires to match the new rim di­
ameter.
Rim size designation
means r im diameter and width .
Rim width
means nominal distance between rim flanges.
Sidewall
means that portion of a tire between the
t read and bead.

Tires an d wheel s 253
Bear in mind that the ti re press ure monitoring
system* can only monitor the tire pressures
you have stored. The system does not recog ­
n ize the load condit ion of your vehicle.
The effectiveness of the tire pressure monitor ­
ing system* will be impaired if you store nor­
mal load pressures but then operate the vehi ­
cle at its maximum load
c;, &.
See the i llustration c;, fig. 208 for the location
of the label on driver's side B-pillar (co lor of
the actua l labe l and exact location on the ve­
h icle wi ll vary slightly). Note that the
following table is accurate at
the time of going to press and is subject to
change. In the event of d iscrepancies, the tire
pressure label is located on the driver's side B­
pillar always takes precedence.
The table below lists the recommended cold
tire inflat ion pressures for the Audi mode l
covered by your Owner's Literature at the vehi­
cle's capacity weight and the t ire sizes instal­
led on the respective models as orig inal
equipment, or as a factory option.
Tire pressure
Model /En-
Tire design ation normal load condition
full load condition
gine fronta> reara>
front rear
PSI kPA PSI kPA PSI kPA PSI kPA
AB /AB L: 235/55 R18 104H
35 240 32 220 36 250 38 260
3 .0 lit er
255/45 R1 9 104H 35 240
32 220 36 250 38 260
6-cy lind er
26 5/40 R2 0 104H 35 240 32 220 36 250 38 260
265 /40 R20 104 V 33 230 32 220 33 230 35 240
275
/35 R 2110 3Y XL 35 240 32 220 36 250 35 240
A8/A8 L: 235 /55 R1 8 104H 35 240
32 220 38 260 38 260
4.0 l it e r
255/4 5 R19 104H 35 240 32 220 38 260 38 260
a-cy lind er
26 5/ 40 R 20 104H 35 240
32 220
38 260
38 260
2
6 5/40 R 20 104V 33 230 32 220 35 240 35 240
27
5/35 R2 110 3Y XL 35 240 32
220
38 260
38 260
AB L
: 265/40 R20 104 V 35 240 32 220 36 250 35 240
6.3 liter
255 /45 R1 9 104H 36 250 32 220
39 270
38 260
12
-cy lin-
26 5/40 R 20 104H 36 250 32 220 39 270 38 260
der
275/35 R 21 103 YXL
35 240 32 220 36 250
35 240
58
: 2 65/40 R 20 10 4V 36 250 32 220 39 270 38 260
4.0 liter
265 /35 R21101 Y 39 270 35 240 44 300 42 290
a-cy lind er
275/35 R 2110 3Y XL 39 270 35 240
44
300 42
290
XL= reinf orce d or extra lo ad tir e. It ma y als o appe ar a s x l, E XTRA LOAD, or RF on th e tire s ide-
w all .
al no rmal load co ndit ion c:> page 252.
The correct tire pressure for the spare wheel is
l ocated on a label on the dr iver's side B-pilla r.
Because technical changes may be made to
ve hicle equ ipment dur ing the model yea r, a l­
ways compa re the tire size designation on the tire pressu
re label on you r vehicle with the
t ires on you r vehicle. Make sure that the t ire
size in formation on the vehicle labe l is the
same as the size of the tires on the vehicle.
This is especially important if the vehicle be-
l ongs to someone else or yo u bought the ...,
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Incorrect wheel alignment
Incorrect wheel alignment can cause exces­
sive tire wear, impairing the safety of the vehi­
cle. If tires show excessive wear, have the
wheel alignment checked by an authorized
Audi dealer or qualified workshop .
All Wheel Drive
Vehicles with quattro must always have tires
of the same size, construction and tread type. For details see ~page 204.
_& WARNING
Sudden tire failure can lead to loss of con­
trol, a crash and serious personal injury!
- Never drive a vehicle when the tread on
any tire is worn down to the wear indica­
tors.
- Worn tires are a safety hazard, they do
not grip well on wet roads and increase
your risk of "hydroplaning" and loss of
control.
- Always keep chemicals that can cause
tire damage, such as grease, oil, gasoline
and brake fluid away from tires.
- Tires age even if they are not being used
and can fail suddenly, especially at high
speeds . Tires that are more than 6 years
old can only be used in an emergency
and then with special care and at lower
speeds .
- Never mount used tires on your vehicle if
you are not sure of their "previous histo­
ry." Old used tires may have been dam­
aged even though the damage cannot be
seen that can lead to sudden tire failure
and toss of vehicle control. Tires and wheels 259
New tires and replacing tires and wheels
New tires and wheels have to be broken in
.
Fig. 212 Tire specificat ion codes on t he s idewall o f a
tire
No. Description
@ Passenger car tire (where applicable)
@ Nominal width of tire in millimeters
@ Ratio of height to width (aspect ratio)
© Radial
® Rim diameter code
® Load index and speed rating
0 U.S. DOT tire identification number
® Audi Original tire
® Sever snow conditions
@ Tire ply composition and materials
used
@ Maximum load rating
@ Treadwear, traction and temperature
grades
@ Maximum permissible inflation pres-
sure
The tires and rims are essential parts of the
vehicle's design . The tires and rims approved
by Audi are specialty matched to the charac­
teristics of the vehicle and can make a major .,.

T up to 118 mph (190 km/h)
U up to 124 mph (200 km/ h)
H up to 130 mph (210 km/ h)
V up to 149 mph (240 km/h)1
)
Z over 149 mph (240 km/h)l)
W up to 168 mph (270 km/h)l)
Y up to 186 mph (298 km/h)l)
Your veh icle is no rma lly factory equipped with
tires , which possess excellent driving charac ­
teristics and give your Audi opt imum driving
comfort . An e lectronic speed limiter
c::> page 30 wi ll normally prevent you r vehicle
from go ing faster than the tire speed ra ting
c:::> .& .
U.S . DOT T ire Identification Numb er (TIN )
and tire manufacture date
This is the t ire's "serial number". It begins
wi th the letters "DOT" and indicates that the
tire meets all federal standards . The next two
numbers or letters indicate the plant where it
was manufactured, and the last four numbers r ep resent the week and year of manufacture.
F or
examp le, the numbers 22 13 mean the ti re
was prod uced in the 22nd week of 2013. The
other numbers are marketing codes that may
or may not be used by the tire manufacturer .
T his information is used to contact consumers
if a t ire defect requires a reca ll.
Aud i original tir e
Tires with t he identification "AO" or "RO" have
been specia lly matched w ith your Audi . We
recommend using only these tires because
they meet the highest standards regard ing
safety and driving character istics when used
correctly . Your authorized Audi dealer will
gladly provide you with more information .
Tire ply compo sit ion and materi als used
The number of plies indicates the number of
layers of rubber-coated fabric in the t ire. In
general, the greater the number of plies, the more weight a tire can support. Tire manufac -
llFt· "h · or ires wit a m ax im um spee d ca pabil ity over 149
mph (2 4 0 k m/h) , tire man ufacturers some times u se
th e le tters " ZR."
Tire s an d wheel s 261
ture rs also must indicate the mate rials in the
tire , which include stee l, nylon , po lyester, and
others .
Maximum Load Rating
This number ind icates the maximum load in
k ilograms and po unds that can be ca rr ied by
the tire.
Tire quality grading for treadwear ,
tract ion, and t emperatur e resistanc e
Tre ad wear, t raction and tempera ture grades
c::> page 2 62 .
Maximum Permissible Inflation Pressure
Th is number is the greatest amount of a ir
pressure that should ever be pu t in the t ire
u nder norma l dr iv ing cond itions .
_&. WARNING ,-=
-Using incorrect o r unmatched tires and/
or wheels or improper tire and wheel
comb inations can lead to loss of control
'
coll is ion and serious personal inj ury.
- Always use tires, rims and whee l bolts
that meet the specifications of original
factory- insta lled tires or other combina ­
tions that have been specifically ap­ proved by the vehicle manufacturer.
- Tires age even if they are not being used
a nd can fail sudden ly , especially at high
speeds . Tires that are more than 6 years
old can only be used in an emergency
and then w ith special care and at lower
speeds.
- Never mo unt used tires on your veh icle if
you are not sure of the ir "previous histo­
ry." O ld used tires may have been dam­
aged even though the damage cannot be
seen that can lead to sudden tire fai lure
and loss of vehicle control.
- All four whee ls must be fitte d with radial
tires of the same type, size (rolling cir­
cumference) and the same tread pattern .
~
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Traction
The traction grades, from highest to lowest,
a re AA, A, Band
C. Those grades represent the
tire's ability to stop on wet pavement as
measured under controlled conditions on
specified government test surfaces of asphalt
and concrete . A tire marked C may have poor
traction performance¢ .&..
Temp eratu re
The temperature grades are A (the highest),
B, and
C, representing the tire 's resistance to
the generat ion of heat and its ability to dissi­
pate heat when tested under controlled condi­
tions on a specified indoor laboratory test
wheel.
Sustained high temperature can cause the
material of the tire to degenerate and reduce
tire life, and excessive temperature can lead
to sudden tire failu re ¢ .&. .
The grade C corresponds to a level of perform­
ance which all passenger car tires m ust meet
u nder the Federa l Motor Ve hicle Safety Stand­
ard No.
1 09. Grades Band A represent higher
l eve ls of pe rformance on the laboratory test
wheel than the m inimum required by law.
_& WARNING
Th e traction grade assigned to this tire is
based on stra ight-ahead b raking t raction
tests, and does not include acceleration,
cornering , hydrop laning or peak traction
character istics.
A WARNING
The temperature grade for this t ire is es ­
tablished for a t ire that is properly inflated
and not overloaded. Excessive speed, un­
derinflation, or excessive loading, either
separate ly or in combination, can cause
heat buildup and possibl e tire fa ilu re.
-
Tire s an d wheel s 263
Winter tires
Winter tires can improve vehicle handling on
snow and ice . At temperatures below 45 °F
(7 °C) we recommend changing to winter
tires.
In some heavy snow areas, local governments
may require true w inter o r "snow" tir es, those
with very deeply cut t read. These tires should
o nl y be used in pairs and be installed o n all
f o ur wheels . Make sure you p urchase snow
ti res that are the same size and cons truc tion
type as the other tires on yo ur vehicle .
I f your veh icle is eq uipped w ith all-whee l
drive *, t his w ill improve trac tion durin g w in ter
driv ing, even wi th the s tanda rd tires. Howev ­
er, we strongly recommend that you always
equip all four wheels on your veh icle w ith cor­
rect ly fitted winter tires or all-season t ires,
when winter road condit ions are expected.
This also improves the veh icle 's b rak ing per­
fo rmance and reduces stoppi ng d ista nces .
Summer tires provide less grip on ice and
snow.
Winter tires (snow tires) must always be fitted
o n all fo ur whee ls .
As k your au thori zed A udi d ealer or qualified
workshop for permit ted
winter tire size s. Use
o nl y radial winter ti res .
Win ter tires lose their effec tiveness whe n the
tread is worn down to a depth o f
0.15 7 inch
(4 mm) .
Only d rive w it h w inte r tir es under w inte r con­
di tions. S umme r tir es handle bette r whe n
t h e re is no s now o r ice on the ro ad s an d the
temperature is above 45 ° F (7 °C) .
I f you have a flat t ire, see notes on spare
whee l
¢page 259.
Please a lways remember that winter tires may
have a lowe r sp eed rating than the tires o rig i­
nally i nstalled on your veh icle at t he time it
was ma nufactu red. Please see ¢
page 260,
Speed ra ting (letter code)
for a lis ting o f th e
speed ra ting lette r codes and the max imum
speed at which the tires can be driven .
111>-
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