2015 AUDI A3 wheel size

146 Airbag sys te m
U.S. Federal Standard if a chi ld with elec­
trical capac itance greater than the com­
bined capacitance of a typical one-year
old infant restra ined in one of the for­
ward fac ing or rearward-fac ing ch ild
seats with which your vehicle was certi­
fied is on the front passenger seat and
the other conditions for airbag deploy­ ment are met.
- Acc ident statist ics have shown that chil­
dren are generally safer in the rear seat
area than in the front seating posit ion .
- For their own safety, all chi ldren, espe­
ci ally 12 years and younger, sho uld a l­
ways ride in the back properly rest rained
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 addit ional
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 dece le rat io n is high enoug h.
The front Advanced Airbag System for the
fro nt seat occupants is not a substitute for
your safety belts . Rather, it is part of the over­
a ll occupa nt restraint system in your veh icle.
A lways remember that the airbag system ca n
on ly help to pro tect you, if you are s itting up ­
right, wearing yo ur safety belt and wearing it
properly. This is why you and yo ur passengers
must always be properly restrained, not just
beca use the law requires you to be.
The Advanced Airbag System in your veh icle
has been certified to meet the " low risk" re­
qu irements for 3 and 6 year-o ld children on
the passenger side and very small adu lts on
the dr iver side. The low risk deployment crite­
ria are intended to he lp 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 instr ument
panel when the airbag inflates .
In add ition, the system has been cer tified to
comply with the "s uppression" requirements
of the Safety Standard, to turn off the front
airbag for infants 12 months o ld and younger
who are restrained on the front passenger
seat in child restraints that are listed in the
Standard
Q page 168, Child restraints and
Advanced front airbag system .
"Suppression" requires the front a irbag on the
passenger side to be turned off if:
- a child up to abo ut one year of age is re­
strained on the front passenger seat in one
of the rear-fac ing or forward-facing infant
restraints listed in Federal Motor Vehicle
Safety Standard 208 with which the Ad ­
vanced A irbag System in your veh icle was
cert ified . Fo r a listing of the chi ld restraints
t hat were used to certify your vehi cle's com­
p lia nce w it h t he US Sa fety S tandard
Qpage 168,
-When a pe rson is detec ted o n the front pas ­
senger seat tha t has an elec trica l capa ci­
tance that is more than the tota l electrical
capacitance of a child that is about 1 year
old restrained in one of the rear-facing or
forward-facing infant restraints (listed in
Federal Motor Vehicle Safety Standard 208
w ith which the Advanced A irbag System in
your veh icle was certified), the front airbag
on the passenger side may or may not de­ p loy .
The
PASS ENG ER AIR BAG OFF light comes on
when the elect ronic cont ro l unit detects a to­
ta l elect rical capac itance on the front passen­
ger seat that requ ires the front a irbag to be
tu rned off. If the
PASSENGER AIR BAG OFF
ligh t does not come on, the front airbag on
t h e passenger side has not been turned off by
the control unit and can deploy if the contro l
u nit senses an impact that meets the condi­
t ions stored in its memory.
If the total e lectr ica l capacitance regis tered
on the front passenger seat is more than that
ll-

168 Child Safety
-Always read and heed all WARNINGS
whenever using a child restraint in ave­
hicle
q page 131, Safety belts,
q page 140, Airbag system and
q page 166, Important things to
know.
(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 the
driver side. The low risk deployment criteria
are intended to reduce the risk of injury
through interaction with the 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 "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.
The vehicle's Advanced Airbag System has a
capacitive passenger detection system in the
front passenger seat cushion that can detect
the presence of a baby or a child in a child re­
straint system on this seat.
The capacitive passenger detection system
registers the changes that result in an electri ­
cal field when a child, a child restraint, and a
baby blanket are on the front passenger seat .
The change in the measured capacitance due
to the presence of a child, a child restraint,
and a baby blanket on the front passenger
seat is related to the child restraint system
resting on the seat. The measured capacitance
of a child restraint system varies depending
on the type of system and specific make and
model.
The electrical capacitance of the various
types, makes, and models of child restraints
specified by the U.S.National Highway Traffic
Safety Administration (NH TSA) in the relevant
safety standard are stored in the Advanced
Airbag System control unit together with the capacitances typical of infants and a 1-year
old child. When a child restraint is used on the
front passenger seat with a typical 1 year-old infant, the Advanced Airbag System compares
the capacitance measured by the capacitive passenger detection system with the data
stored in the electronic control unit. Child restraints and Advanced front
airbag system
Regardless of the child restraint that you use,
make sure that it has been certified to meet
United States Federal Motor Vehicle Safety
Standards and has been certified by its manu­
facturer for use with an airbag. Always be sure
that the child restraint is properly installed at
one of the rear seating positions. If in excep­
tional circumstances you must use it on the
front passenger seat, carefully read all of the
information on child safety and Advanced Air-
bags and heed all of the applicable .,..

186 Smart T echnol ogy
correctly. ED L will switch on again automati ­
cally when conditions have returned to nor­
mal.
Electroni c inte raxle diff ere ntial lo ck */
s e le ct ive w heel t orqu e cont rol *
The electronic interaxle differential lock (front
wheel drive) or the selective wheel torque
contro l (all wheel drive) operates when driving
through curves. The front whee l on the inside
of the curve or both wheels o n the inside of
the curve are braked selectively as needed .
This minimizes s liding in the front wheels and
a llows for more precise driving through
curves. The app licab le system may not acti­
vate when driving in wet or snowy conditions .
Post-collision bra ke ass ist
"Post-collision brake assist" can ass ist the
driver during a collision by reducing the dan­
ge r of slipp ing and further co llision and by au­
tomatic braking.
"Post-collision brake assist" functions during
front, side and rear collis ions when the a irbag
control module a detects a trigger level and
the co llision takes place at a dr iv ing speed
faster than 6 mph (10 km/h). The braking of
the vehicle happen automatically via the ESC
as long as the ESC, the hydraulic brake sys­
tem, and the vehicle electrical system are not
damaged from the coll ision.
The fo llowing activ ities override the automat­
ic braking during a collision:
- If the dr iver presses the accelerator peda l.
T here is no a utomatic braking.
- When the force on the press brake pedal is
stronger than the b raking force initiated by
the system . The vehicle is manually braked .
- When the ESC is damaged and the "post­
collision brake assist" is not availab le.
A WARNING
- The ESC, ABS, ASR, EDL, electron ic inter­
axle d ifferential lock or select ive wheel
torque control cannot overcome the laws
of physics. This is espec ially important
on sl ippery o r wet roads.
If the systems
begin acting to stabili ze your veh icle, you
should immediately alter your speed to
match the road and traffic conditions . Do
not let the increased safety prov ided
tempt you into tak ing risks. This could
increase your risk of a collision.
- Please note the risk of a collision increas­
es when driving fast, especially through
curves and on slippery or wet roads, and
when dr iv ing too close to objects ahead .
ESC, ABS, the brake assist system, EDL,
electronic interaxle differentia l lock or
selective whee l to rque control cannot
p revent coll is ions.
- Press the acce lerator pedal carefully
when acce le rat ing o n even, slippe ry sur­
f a ces such as ice and snow. The drive
wheels can spin even when these control
systems are installed and this can affect
driving stability and increase the risk of a
col lision.
(D Tips
- ABS and ASR only function correc tly
when all four wheels are eq uipped w ith
identical tires. Different t ire sizes can
lead to a reduction in engine power.
- Yo u may hear noises when the systems
described are working .
- If the
DJ or m] (USA models) !II] (Cana ­
da mode ls) indicator light appears, there
may be a malfunction
¢ page 22.

226 Tire s and wheel s
-Never mount used tires on yo ur 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 t ire failure
and loss of vehicle control.
- If you notice unusual vibration or if the
vehicle pulls to one side when driving, al­
ways stop as soon as it is safe to do so
and check the wheels and tires for dam­
age.
(D Note
- Please note that summer and winter
tires are designed for the cond itions that
a re typ ica l in those seasons. Aud i recom­
mends using w inter t ires d uring the win-
Glossary of tire and loading terminology
Accessory weight
means t he comb ined we ight (in excess of
those standard items which may be rep laced)
of automatic transmission, power steering,
power brakes, power windows, power seats,
radio, and heater, to the extent that these
items are availab le as factory-installed equip­
ment (whether installed or not).
A spect ratio
means th e ratio of the height to the width of
the tire in percent. Numbers of 55 or lower in­
d icate a low sidewall for improved steer ing re­
sponse and better overall handling on dry
pavement .
Bead
means the part of the tire th at is made of
steel wires, wrapped or reinforced by ply cords
and that is shaped to fit the rim.
Bead s eparation
means a breakdown of the bond between
components in the bead.
Cord
means t he strands forming the plies in the
tire. ter months.
Low tempe ratu res signifi­
cantly decrease the elasticity of summer
tires, which affects traction and braking ability. If summer tires are used in very
co ld temperatures, cracks can form on
the tread bars, resu lting in permanent
tire damage that can cause loud driving
noise and unbalanced tires. Aud i is not
responsib le for this type of damage.
- Burn ished, polished or chromed rims
must not be used in winter weather. The
surfa ce of the rims does not have suff i­
c ien t cor rosion prote ct io n for this and
co uld be pe rmanen tly damaged by road
salt or simi lar substances. This damage
is not cove red by war ranty.
Cold tire inflat ion pre ssure
mea ns the t ire press ure recommended by the
vehicle manufacturer for a tire o f a des ignated
size that has not bee n driven for more than a
coup le of miles (ki lometers) at low speeds in
the three hour period before the tire press ure
is measured or adjusted.
Curb weight
means the weight of a motor vehicle w ith
standard equipment including the maximum
capacity of fuel, o il, and coolant, air condi­
tion ing and additional weight of optional
equipment.
E x tra load tire
means a tire design to operate at higher loads
and at higher inflation pressures than the cor­
responding standard tire. Extra load tires may
be identified as "XL", "xl", "EXTRA LOAD", or
"RF" on the sidewall.
Gross A xle Weight Rating ("GAWR")
means the load-carrying capacity of a single
axle system, measured at the tire-ground in-
terfaces.
IJ>,

Gross Vehicle Weight Rating ("GVWR")
means the maximum total loaded weight of
the vehicle .
Groove
means the space between two adjacent tread
ri bs.
Load rating (code)
means the maximum load that a tire is rated
to carry for a given inflat ion pressure . You
may not find this information on all tires be­
cause it is not requ ired by law .
Ma ximum 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 capac ity weight, and
(d) Production opt ions weight
Ma ximum (permissible) inflation pressure
means the maximum co ld inf lation pressure
to which a tire may be inflated . Also called
"maximum inflation pressure."
Normal occupant weight
means 150 lbs. (68 k ilograms) times the
number of occupants seated in the vehicle up
to the tota l seating capacity of yo ur vehicle.
Occupant distribution
means distribution of occupants in a veh icle.
Outer diameter
means the overall 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 e levations due to labeling, decorations, or
protective bands or ribs .
Tires and wheels 22 7
Ply
means a layer of rubbe r-coated parallel cords.
Production options weight
means the combined weight of those installed
regular production opt ions we ighing over 5
lbs. (2.3 kg) in excess of those standa rd items
which they replace, not previously considered
in curb weight or accessory weight, including
heavy duty brakes, ride levelers, roof rack,
heavy duty battery, and special trim.
Radial ply tire
means a pneumatic tire in which the ply cords
that extend to the beads are laid at substan­
tially 90 degrees to the centerl ine of the
tread.
Recommended inflation pressure
see ~ page 226, Cold tire inflation pressure .
Reinforced tire
means a tire design to operate at higher loads
and at higher inflation pressures than the cor­
responding standard tire . Reinforced tires
may be identified as "XL", "xl", "EXTRA LOAD",
or "RF" on the sidewal l.
Rim
means a metal support for a tire or a tire and
tube assembly upon which the tire beads are
seated .
Rim diamete r
means nominal diameter of the bead seat. If
you change your wheel s ize, you wi ll have to
purchase new tires to match the new r im di­
ameter.
Rim size designation
means rim diameter and width.
Rim width
means nominal distance between rim flanges.
Sidewall
means that portion of a tire between the
tread and bead .
•
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•

Tires and wheels 229
Occupant loading and distribution for vehicle normal load for various designated seating
capacitie s
Designated seating capacity, Vehicle normal load, number Occupant distribution in a nor-
number of occupants of occupants mally loaded vehicle
5 3 2 in front, 1 in back seat
Cold tire inflation pressure
Tire pressure affects the overall handling, performance and safety of a vehicle.
Fig. 156 Tir e p ress ure la bel: located on driver 's s ide B·
p ill ar
Tire pressure generally refers to the amount
of air in a tire that it needs it to do its job and
safely carry the combined load of the entire
vehicle and its contents . Tire pressure is
measured in kilopasca ls (kPa), the interna­
tional measuring unit and in pounds pe r
squa re inch (PSI). Tire pressure is based in
part on the vehicles design and Load limit -
the greatest amount of weight that the vehi­
cle can carry safe ly and the t ire size . The prop­
er tire pressure is frequent ly referred to as the
"recommended cold tire inflation pressure."
Air in the tires expands when the tire heats up
because of internal friction when it flexes in
use . The tire pressure is higher when the tire
has warmed up than when it is "cold ."
It is the
in flat ion pressure i n a "cold " tire that counts.
Therefore, you shou ld neve r let air out of a
warm tire to ma tch "cold tire inflation pres­
sure" recommendations. The tir es wo uld then
be underinflated and could fail suddenly .
Maintaining prop er t ire pressure is one of the
most impor tant things you can do to help
avoid sudden tire failure. Underinflated tires
are a ma jor cause of s udden tire failure . Keep·
ing tires at the right pressure is also impor­
tant for safe and responsive vehicle handling,
-tD
-
---------------------.. ,;
•(==.: I :::; I :,,. I)@ gi n. ............ .,_____, .... -.ito._.. ____ .... _ ...
&..p0idit,101111-~--.,...,....-- ..... ~ .... ..
-··-­.....
-
-Dlst<:OURS
- KPA.. a PSI
- KPA..
a PS I
- KPA.. a PSI
Fig. 157 Tire pressu re labe l
traction, braking and Load carrying. Tire pres­
sures are particularly important when the
vehicle is being driven at higher speeds, and
then especially when heavily loaded even
within the permissible load-carrying capaci­
ties approved for your vehicle.
The recommended tire pressures for your Audi
depend on the kind of tires on your ve hicle
and the number of passengers and/o r amount
of Luggage you w ill be transporti ng.
The tire pressure Label is located on the driv­
er's side B -pillar . The tire pressure labe l Lists
the recommended cold tire inflat io n pressures
for the vehicle at its maximum capacity
weight and tires that were on your veh icle at
t he time it was manufactured.
If you wish to improve comfort when operat­
ing the vehicle at normal load (up to 3 occu­
pants), you can adjust tire pressures to those
specified for normal vehicle load. Before op­
erating the vehicle at maximum load, you
must increase the tire pressures to those
specified for maximum vehicle load
¢ &.
Bear in mind that the tire pressure monitoring
system can only monitor the tire pressures
II>

230 Tire s and wheel s
you have stored . The system does not recog ­
nize the load condition of your vehicle.
The effectiveness of the tire pressu re monito r­
ing system w ill be impaired if you store nor­
mal load pressures but then operate the vehi ­
cle at its maximum load¢.&. .
See the il lustration¢
fig. 156 for the location
of the label on dr iver's side 8-pillar (color of
the actua l labe l and exact location on the ve­
hicle wi ll vary slightly).
Note that the followi ng tab le is accurate at
the time o f go ing to press and is subject to
Model / Tire de
signation
change. In the event of discrepancies, the t ire
pressure label is located on the driver's side 8-
pillar always takes precedence .
T he table below lists the recommended cold
ti re inflation pressu res for the Audi mode l
covered by your Owner's Literature at the vehi­
cle's capacity weight and the t ire sizes instal­
l ed on the respective models as original
equipment, or as a factory option.
Tire pressure
Engine normal load condition full load condition
front rear front rear
PSI kPA PSI kPA PSI kPA PSI kPA
A3: 225 /45 Rl 7 91 Y
32 220 29 200 35 240 35 240 1
.8 lit er High P erform ance
4 -cy lind er
22 5/40 R18 92Y XL
Hi gh Perfo rmance
35 240 32 220
35 240
35 240
2
2 5/45 Rl 7 91H
35 240
32 220 39 270 39 270 All S
ea son
2 25 /40 R18 92H XL
35 240 32 220 39 270 39 270 All Season
2 35/35 Rl 9 91 Y XL
32 220 29 200 35 240
35 240 High Performan
ce
C o mp act spar e whe el
60 420 60 420
60 420 60 420 11
25/70 R 18
A 3: 225 /45 Rl 7 91Y
33 230 30 210 36 250 36 250 2.0 liter High Perfo rman ce
4 -cy linder
22 5/40 R18 92Y XL
High Performan ce
33 230 30 210 36 250 36 250
225 /45 R1 7 91H
36 250 33 230 41 280 41 280 All Seaso n
225 /40 R18 92H XL
36 250
33 230 41 280
41 280 All Seaso n
23 5/3 5 R1 9 9 1 Y XL
33 230 30 210 36 250 36 250 High P erformance
C o m pact spa re w heel
60 420 60 420 60 420 60 420 1125 /70 R18
X L= reinf orced or extra lo ad tir e. It m ay als o a ppe ar as x l, EX TRA L OAD , or RF on the ti re side-
wall .

The correct tire pressure for the spare wheel is
l ocated on a label on the driver's side B-pillar.
Because tec hnical changes may be made to
vehicle equ ipment dur ing the model yea r, a l­
ways compa re the tire size designation on the
tire pressure label on your vehicle wit h the
tires on your vehicle . Make s ure that the tire
size information on the veh icle label is the
same as the s ize of the tires on the vehicle.
This is especially important if the vehicle be ­
longs to someone else or you bought the veh i­
cle with different rims/tires or you boug ht the
ve hicle as a previously owned vehicle.
Remember, your safety and that of your pas­
sengers also depends on mak ing su re that
l oad limits are not exceeded. Vehicle load in­
cludes everybody and everything in and on the
veh icle. These load limits are technically refer­
red to as the vehicle's Gross Vehicle We ight
Rating ("GVWR") . The Gross Ax le Weight Rat ­
ing ("GAWR") is the maximum load that can
be app lied at each of the veh icle's two axles.
The Gross Vehicle Weight Rating and the
Gross Axle Weight Rating are listed on the
safety compliance st icker label located on the
driver's side B-p illa r. The t ire pressure label o n
your Aud i lists the maximum combined
weight of a ll of the occupants and luggage or
other cargo that the vehicle can carry. For the
l ocation of the tire pressure labe l~
fig. 156.
A WARNING
Overloading a vehicle can cause loss of ve­
hicle control, a crash or other accident, se­
rious personal injury, and even death.
- Carrying more weight than yo ur vehicle
was designed to carry will prevent the
vehicle from handling properly and in­ crease the risk of a loss of veh icle con­
trol.
- The brakes on a veh icle that has been
overloaded may not be able to stop the
vehicle within a safe distance .
- Tires on a vehicle that has been overload­
ed can fail suddenly causing loss of con­
t rol and a crash.
Tire s an d wheel s 231
-Always make sure that the total load be­
ing transported - includ ing the weight of
a trailer hitch and the tongue we ight of a
loaded trailer -does not make the vehi­
cle heavier than the vehicles Gross Veh i­
cle Weight Rating.
A WARNING
- Inco rrect tire pressures and/or underin­
flation can lead to a ser ious or fatal acci­
dent.
- Inco rrect tire pressures and/or underin­
flation cause increased tire wear and can
affect the handling of the vehicle.
- Inco rrect tire pressures and/or underin­
flation can a lso lead to sudden t ire fail­
ure, including a blowou t and sudden de­
flation, caus ing loss of veh icle contro l.
Checking tire pressure
The correct tire pressure for the tires original­
ly installed on your vehicle is listed on the tire
pressvre label located on driver's side 8-pil ­
lar.
T he recommended tire pressures are on the
ti re pressure label and in the table
~ page 229, Cold tire inflation pressure . This
means that the pressure m ust be checked and
adjusted when the tire has not been dr iven for
more than a couple of miles (kilometers) at
low speeds during the previous three hours.
Air in the tires expands when the tire heats up
as a result of internal frict ion as it flexes in
use. The tire pressure is h igher when the tire
has warmed up t han when it is "cold."
It is the inflation pressure in a "cold" t ire that
counts. Therefore, you should never let a ir out
of a warm tire to match "Cold tire inflat ion
pressure" recommendat io ns ~
page 229 . Th e
ti res wo uld then be unde rinfl ated and co uld
fail suddenly.
T he tire pressure label on your Audi lists the
recommended co ld tire inflation pressures at
max imum capacity for the new, or ig inal
equipment tires that were on your vehi cle at
•
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