2018 AUDI A4 wheel size

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prevent collisions -the re is still a risk of ac­
c idents!
- Press the accelerator pedal ca refully when
accelerating on smooth, slippery surfaces
such as ice and snow. The dr ive wheels can
spin even when these control systems are
installed and th is can affect driving stability
and increase the r isk of a coll is ion.
Switching on/off
Intellig ent Technology
{!) Tips
- The ABS and ASR only funct ion correct ly
when all four wheels have a sim ilar wear
condition. Different tire sizes can lead to a
reduction in engine power.
- You may hear noises when the systems de­
scribed are working.
£SC turns on automatically when you start the engine.
Fig. 1 55 Cente r co nso le w it h b utton~ °"
The following sit uat ions are exceptions where it
may be useful to switch on sport mode (sedan) or
offroad mode (allroad) to allow the whee ls to
spin :
- Rocking the vehicle to free it when it is stuck
- Dr iving in deep snow or on loose ground
- Dr iving with snow chains
- App lies to: allroad: Driv ing on ro ugh te rra in
when much of the car's weig ht i s l ifte d off the
wheels ( axle articul at ion)
The ESC is designed to fu nction in levels. Depe nd­
i ng o n the level that is selected , the s tabilization
f u nction o f the ESC is limited or switched off. The
amo unt of stabilization control will d iffer de ­
pending on t he leve l. -
App lies to: allroad: Driv ing down hill while brak­
ing on loose grou nd
Fo r yo ur safety, switch the spo rt mode/offroad
mode off in advance.
ESC levels
Applies to: sedan
Sport mode on ESC/ASR off Sport mode off or
ESC /ASRon
Behavior
The ESC and ASR stab ili za- The stabilization f unct io n is The f ull stabiliza tion f un c-
t ion f un ct ions are lim ited not avai
lab le
¢ &. . ES C and
tion of the ESC and ASR is
¢ &. . ASR are swi tched off . avai
lab le aga in.
Op eration Press the !.r, O FFI button P ress and hold the j.r, O FFI Press the j.r, O FFI button
briefly . button longer than 3 sec- aga in .
o nds.
Ind icato r II turns on. fl and jf'll•)~~ turn on. II turns off or II and
lights lf'll•U~ turn off.
Me ssages Stabilization contro
l (ESC ):
Stabilization control (ESC ): Stabilization control
s port . Warning! Restricted off. Warning! Restricted (ESC
): on
stability stability
147

Voice recognition system
Voice recognition system Operating
Applies to: vehicles with vo ice recognition system
You con operate many Infotainment functions
conveniently by speaking.
Req uirements: the ignition and the MM I must be
sw itched
on~ page 155 , there must not be any
phone call in progress and the parking system
m ust not be active .
.. Switching on: press the~ button @
¢
page 15, fig. 11 or ¢ page 16, fig . 13 briefly
on the multifunction steering wheel and say
the des ired command after the
Beep .
.. Switching off : press and hold the~ button.
Or: press the l2l button.
.,. Pause : say the command Pause . To resume,
press
the~ button .
.,. Correcting : say the command Correction . Or :
simp ly say a new comma nd during an an­
no uncement ¢
page 248.
Input assistance
The system gu ides you throug h the input with
visual and audio feedbac k.
- Visual input as sistance : after switching on
vo ice recognit ion, a display with a selection of
poss ible commands appears . This command
display can be sw itched on o r off. Se lect:
IMENU I button> Set tings > left co ntrol button
> MMI setting s> Speech di alog system .
- Audio input a ssistanc e:
to have the poss ible
commands read, turn t he voice recogn ition sys­
tem on and say
Help.
For the system to understand you:
Speak clearly and dist inctly at a normal volume .
Speak louder when d riving faster .
Emphasize the words in the commands even ly
and do not leave long pauses .
Close the doors, the windows and the sunroof* to reduce background noise . Make sure that passen­
gers are not speaking when you are giving a voice
command .
168
Do not direct the air vents toward the hands -free
microp hone, which is on the roof headliner near
the front interior lights .
Only use the system from the dr iver's seat be­
ca use the hands -free microphone is directed to ­
ward that seat .
Additional settings
See¢ page 248, Speech dialog system .
.8, WARNING
-Dire ct yo ur full attention to dr iv ing . As the
driver, you have complete responsibility fo r
safety in traffic. Only use the functions in
such a way that yo u always maintain com­
plete contro l over your vehicle in a ll traffic
situations .
- Do not use the voice recognition system in
emergencies beca use your voice may change
in stressful s ituations. It may take longer to
dia l the number or the system may not be
ab le to dial it at all. Dial the emergency
number manually.
(D Tips
- The d ialog pauses when there is an incom­
ing phone call and will continue if you ig­
nore the call. The dia log ends if you answer
the ca ll.
- You can select an item in the list us ing ei­
ther the vo ice recognit ion system or the
cont rol knob.
Command overview
information
Applies to: vehicles with voice recognition system
The following overv iews des cribe the commands
that can be used to operate the MMI using the
voice recognition system.
Alte rnative commands are separated using a"/ ",
for example say:
Telephone / (or) Navigation /
(or) Radio.
Sequences of commands used to perform an a c­
tion are identified w ith a
"> ", fo r example say:
Enter addre ss> (t hen) Enter country /state . ..,.

Airbag system
-Never hold the steering wheel at the 12
o'clock position or with your hands any­
where inside the steering wheel or on the
steering wheel hub. Holding the steering
wheel the wrong way increases the risk of
severe injury to the arms, hands, and head if
the driver airbag deploys.
,& WARNING
Objects between you and the airbag will in­
crease the risk of injury in a crash by interfer­
ing with the way the airbag unfolds and/or by
being pushed into you as the airbag inflates.
- Always make sure nothing is in the front air-
bag deployment zone that could be struck
by the airbag when it inflates.
-
- Objects in the zone of a deploying airbag
can become projectiles when the airbag de­
ploys and cause serious personal injury.
- Never hold things in your hands or on your
lap when the vehicle is in use.
- Never place accessories or other objects
(such as cup holders, telephone brackets,
note pads, navigation systems, or things
that are large, heavy, or bulky) on the doors;
never attach then to the doors or the wind­
shield; never place them over or near or at­
tach them to the area marked ,,AIRBAG" on
the steering wheel, instrument panel or the
seat backrests; never place them between
these areas and you or any other person in
the vehicle.
- Never attach objects to the windshield
above the passenger front airbag, such as
accessory GPS navigation units or music
players. Such objects could cause serious in­
jury in a collision, especially when the air­ bags inflate.
- Never recline the front passenger seat to transport objects. Items can also move into
the deployment area of the side airbags or
the front airbag during breaking or in a sud­
den maneuver. Objects near the airbags can
fly dangerously through the passenger com­ partment and cause injury, particularly
when the seat is reclined and the airbags in­
flate.
276
,& WARNING
, -
A person on the front passenger seat, espe­
cially infants and small children, will receive
serious injuries and can even be killed by be­ ing too close to the airbag when it inflates .
- Although the Advanced Airbag System in your vehicle is designed to turn off the front passenger airbag if an infant or a small child
is on the front passenger seat, nobody can
absolutely guarantee that deployment un­
der these special conditions is impossible in
all conceivable situations that may happen
during the useful life of your vehicle.
- The Advanced Airbag System can deploy in accordance with the
,.low risk" option for 3-
and 6-year-old children under the U.S. Fed­
eral Standard if a child with electrical capac­
itance greater than the combined capaci­
tance of a typical one-year old infant re­
strained in one of the forward facing or rear­
ward-facing child seats with which your ve­ hicle was certified is on the front passenger
seat and the other conditions for airbag de­
ployment are met.
- Accident statistics have shown that children
are generally safer in the rear seat area than
in the front seating position.
- For their own safety, all children, especially
12 years and younger, should always 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 (FMVSS)
208, as well as Canada Motor Vehicle Safety
Standard (CMVSS) 208 as applicable at the time
your vehicle was manufactured .
-
The front Advanced Airbag System supplements
the safety belts to provide additional protection
for the driver's and front passenger's heads and upper bodies in frontal crashes. The airbags in­
flate only in frontal impacts when the vehicle de-
celeration is high enough.
ll>

0 C0 .-< N ..... N .-< 0
~ a:,
Bead separa tion
means a breakdown of the bond
between components in the bead.
Cord
means the strands forming the
plies in the tire .
Cold tire inflation pressure
means the tire pressure recom­
mended by the vehicle manufac­
turer for a tire of a designated size that has not been driven for
more than a couple of miles (kilo­
meters) at low speeds in the
three hour period before the tire
pressure is measured or adjusted .
Curb weight
means the weight of a motor ve­
hicle with standard equipment in­
c luding the maximum capac ity of
fuel, oi l, and coolant, a ir condi­
tioning and add itional weight of
optional equipment.
E xtra load tire
means a tire designed to operate
at higher loads and at h igher in ­
flation pressures than the corre­ sponding standard tire. Extra load
tires may be identified as
"X L",
"xl", "E XTRA LOAD" , or "RF" on
the s idewal l.
Wheels
Gross Axle Weight Rating
( " GAWR")
means the load-carrying capacity
of a single axle system, measured
at the tire -ground interfaces.
Gross Vehicle Weight Rating
(" GVWR ")
means the max imum total loaded
weight of the vehicle.
Groove
means the space between two ad­
jacent tread ribs .
Load rating (code)
means the maxim um load that a
tire is rated to carry for a given in­
flat ion pressure . You may not f ind
this informat ion on all tires be ­
cause it is not required by law.
Maximum load rating
means the load rating for a tire at
the maximum permissible infla­
tion 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 we ight
33 7

0 C0 .-< N ..... N .-< 0
~ a:,
Rim
means a metal support for a tire
or a tire and tube assembly upon
which the tire beads are seated.
Rim diameter
means nominal diameter of the
bead seat. If you change your
wheel size, you will have to pur­
chase new tires to match the new
rim diameter.
Rim size designation
means rim diameter and width.
Rim width
means nominal distance between
rim flanges .
Sidewall
means that portion of a tire be­
tween the tread and bead .
Speed rating (letter code)
means the speed at which a t ire is
designed to be driven for extend­
ed periods of time . The ratings
range f rom 93 mph (150 km/h)
to 186 mph (298 km/h)
¢ table
on page 335.
You may not find
this information on all tires be­
cause it is not required by law.
The speed rating letter code ,
w here applicable, is molded o n
the tire sidewall and indicates the
Wheels
maximum permissible roa d
speeds
¢ A in Winter tires on
page 349.
Tire pressure monitoring
system
means a system that detects
when one or more of a vehicle's
ti res are underinflated and illumi­
na tes a low tire pressure warning
telltale.
Tread
means that po rtion of a ti re that
comes i nto contact with the road .
Tread separation
means pulling away of the tread
from the tire carcass.
Treadwear indicators (TWI)
means the projections withi n the
principa l grooves desig ned to g ive
a visua l indication of the degrees
of wear of the t read. See
¢ page 343, Treadwear indicator
for mo re in fo rmat ion on meas ur­
ing t ire wear .
Uniform Tire Quality Grading
is a tire information system devel­
oped by the United Sta tes Nation­
a l Highway Traffic Safety Admin­
istration ( NHTSA) tha t is designed
to help buyers make re lat ive
339
..

for the number of seating posi­
tions. Refer to the table ¢
table
on page 346
for the number of
people that correspond to the ve­
hicle normal load.
New tires or wheels
Audi recommends having all work on tires or wheels performed by
an author ized Audi dealer or au­
thorized Audi Service Facility.
These facilities have the proper
knowledge and are equipped with
the required tools and replace­
ment parts.
.,.New tires do not yet have the
optimum gripping properties. Drive carefully and at moderate
speeds for the first 350 miles
(500 km) with new tires.
.,.Use tires of the same construc­
tion, size (rolling circumference)
and as close to the same tread
pattern as possible on all four
wheels.
.,.Do not replace tires individually .
At least replace both tires on the
same axle at the same time.
.,.Audi recommends that you use
Audi Original Tires. If you would
~ like to use different tires, please .-<
~ note that the tires may perform .-< 0
~ a:,
Wheels
differently even if they are the
same
size ¢.&,. .
.,. If you would like to equip your
vehicle with a tire/rim combina­
tion that is different from what
was installed at the factory, con­
sult with an authorized Audi
dealer or authorized Audi Service
Facility before making a pur­
chase¢ .&,..
If the spare tire is different from
the regular tires installed on the
vehicle
-for example, if winter
tires or wide tires are installed
-
then only use the spare tire tem­
porarily in case of emergency and
drive carefully while it is in use . It
should be replaced with a regular
tire as soon as possible.
On
all wheel drive vehicles, all
four wheels must be equipped
with tires that are the same brand
and have the same construction
and tread pattern so that the
drive system is not damaged by different tire speeds. For this rea­
son, in case of emergency, only
use a spare tire that has the same
circumference as the regular
tires.
341

Wheels
&,. WARNING
-Do not use steel rims that are 17 inches or larger . Other­
wise, damage to the vehicle
and an accident could result.
-For technical reasons, it is not
possible to use tires from oth­
er vehicles - in some cases,
you cannot even use tires from
the same vehicle model.
-Make sure that the tires you
select have enough clearance
to the vehicle. Replacement
tires should not be chosen
simply based on the nominal
size, because tires with a dif­
ferent construction can differ greatly even if they are the
same size . If there is not
enough clearance, the tires or
the vehicle can be damaged
and this can reduce driving
safety and increase the risk of an accident.
-Only use tires that are more than six years old when abso­
lutely necessary and drive
carefully when doing so .
-Do not use run-flat tires on your vehicle. Using them when
not permitted can lead to ve­
hicle damage or accidents.
342
-If you install wheel covers on the vehicle, make sure they al­
low enough air circulation to
cool the brake system. If they
do not, this could increase the
risk of an accident.
Tire wear /damage
Fig. 275 Tire profile: treadwear indica­
tor
Tire wear
Check the tires regularly for wear.
-Inflation pressure that is too low
or high can increase tire wear
considerably.
- Driving quickly through curves,
rapid acceleration and heavy
braking increase tire wear.
-Have an authorized Audi dealer or authorized Audi Service Facili­
ty check the wheel alignment if
there is unusual wear .
-Have the wheels rebalanced if an
imbalance is causing noticeable
vibration in the steering wheel. If you do not, the tires and other
..

0 C0 .-< N ,... N .-< 0
~ a:,
-The tire must flex more if the
tire pressure is too low or if
the vehicle speed or load are
too high. This heats the tire up
too much . This increases the
risk of an accident because it
can cause the tire to burst and result in loss of vehicle con­
trol.
-Incorrect tire pressure in­
creases tire wear and has a
negative effect on driving and
braking behavior, which in­
creases the risk of an accident .
(D Note
Replace lost valve caps to re­
duce the risk of damage to the
tire valves.
Tire pressure table
Please note that the information
contained in the following table
was correct at the time of print­ ing, and the information is sub­
ject to change. If there are differ­
ences between this information
and the tire pressures specified
on the label on the driver's side B­
pillar, always follow the specifica­
tion on the B -pillar label
¢ page 344, fig. 2 76.
Wheels
'® For the sake of the environment
-Tire pressure that is too low
increases fuel consumption.
-Fuel consumption may also in­
crease when driving with the
comfort tire pressure is se­
lected.
Audi recommends using the
tire pressure specified for a
normal load
¢ table on
page 346
or for a full load
when the vehicle is partially
loaded.
Make sure that the tire designa­
tion on your tire matches the des­ ignation on the tire pressure label
and the tire pressure table.
The following table lists recom­ mended tire pressures in cold
tires according to the load and
the size of the tires installed .
..
345