wheel AUDI S8 2016 Repair Manual

Occupant loading and distri­
but ion for vehicle normal load
for various design ated se ating
c a pa cit ies
Refer to the tire inflation pres­
sure label ¢
page 246, fig. 208
for the number of seating posi­
tions. Refer to the table ¢
table
on page 248
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 authorized Audi dealer or au­
thorized repair facility. These fa ­
cilities have the proper knowl ­
edge and are equipped with the
required tools and replacement
parts .
.,,. New tires do not yet have the
opt imum adhesion properties.
Drive carefully and at moderate
speeds for the first 350 m iles
(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.
ci :c ": ....
'° V, ....
'° ....
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 equipment tires. If
you would like to use different
tires, please note that the tires may perform differently even if
they are the same size¢,&..
.,,. If you would like to equip your
vehicle w ith a tire/r im combina­
tion that is different from what
was installed at the factory, con ­
sult w ith an authorized Audi
dealer or authorized repair facili­
ty before making a purchase
~ .&. -
The spare tire* is diffe rent 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.
All four whee ls 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 .,.
24 3

Wheels
use a spare tire* that is the same
circumference as the regular
tires .
A WARNING
-Only use tire/rim combina­
tions and suitable wheel bolts
that have been approved by
Audi. Otherwise, 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 6 years old when abso-
244
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.
-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. 206 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 repair facility
i.

Wheels
check the wheel alignment if have approximately the same
there is unusual wear. length of service life.
-Have the wheels rebalanced if an
For unidirectional tires, make
imbalance is causing noticeable
sure the tires are installed accord-
vibration in the steering wheel. ing to the running direction indi-
If you do not, the tires and other cated on the tire sidewall
vehicle components could wear
¢ page 264.
more quickly.
Hidden damage
Treadwear indicator
Damage to tires and rims can of-
The original tires on your vehicle ten occur in locations that are
have 1/16 inch (1.6 mm) high hidden. Unusual vibrations in the
"wear indicators" ¢
fig. 206 run-
vehicle or pulling to one side may
ning across the tread . Marks on
indicate that there is tire damage.
the tire sidewall (for example Reduce your speed immediately.
"TWI" or other symbols) indicate
Check the tires for damage. If no
the positions of the tread wear in- damage is visible from the out-
dicators. side, drive slowly and carefully to
The tires have reached the mini- the nearest authorized Audi deal-
mum tread depth
l) when they er or authorized
repair facility to
have worn down to the treadwear have the vehicle inspected
.
indicators. Replace the tires with
_& WARNING
new ones ¢&. -
Tread that has worn too low or
Wheel rotation different tread depths on the
Rotating the wheels regularly is tires can reduce driving safety.
recommended to ensure the tires This
can especially have a nega-
wear evenly. To rotate wheels, in- tive effect on handling, on the
stall the wheels from the rear risk aquaplaning when driving
axle on the front axle and vice through water, when driving
versa. This will allow the tires to through curves and when
..
.... N ci :c ": .... l) Obey
any applicable regulations in your '° "? .... country. '° ....
245

Wheels
braking, which increases the
risk of an accident.
Tire pressure
pressure to the maximum speci­
fied pressure
c:::> ,&. .
Checking/correcting tire
pressure
f •Check the tire pressure at least
:r
..; once per month and also check it
Fig. 207 Driver's side B-pillar : tire pres­
sure label
:;;
-(~. -----~ ,~
( :=~ ~~:: I ~ I :. I)( ::-) n.,_.....,__.o1___.. .. -vo.._.......... • ... _ ... le~---~--.....,,_.,-'"-,............ ....,, .
lllf """ PNW 07:0lifla.l
-KPA. a PSI
- KPA.
a PSl
- KPA.
a PSl
Fig. 208 Tire pressure label
SEE OWNEJll"S MAMJAI.FOR
AODmOHAI.
INIFOAMATlON
VOOIUMANUEl.
DUNIOl'N:iTA.IRE POUR
P'l. US DE HTS J
The correct tire pressure for tires
mounted in the factory and for
the spare tire* is indicated on a la­
bel. The label is located on the B­
pillar
c:> fig. 207, c> fig. 208.
When the vehicle is partially load­
ed (up to 3 people), use the tire
pressure specified for normal
loads
c:> table on page 248. If
driving the vehicle when fully loaded, you must increase the tire
246
before every long drive.
•Always check the tire pressure
when the tires are
cold. Do not
reduce the pressure if it increas­
es when the tires are warm.
•Check the label
c:> fig. 208 for
the correct tire pressure based
on vehicle load.
•Correct the tire pressure if nec­
essary.
•Vehicles with Tire Pressure Mon­
itoring System*: store the modi­
fied tire pressure in the Infotain­ ment system
c:> page 255.
•Check the pressure in the emer­
gency tire*/spare tire*. Always
maintain the maximum temper­
ature that is specified for the
tire.
A WARNING ~
Always adapt the tire pressure
to your driving style and vehicle load.
-Overloading can lead to loss of
vehicle control and increase

the risk of an accident. Read
and follow the important safe­
ty precautions inc:::>
page 248 ,
Tires and vehicle load limits.
-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
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 246, fig. 207.
Wheels
braking behavior, which in ­
creases the risk of an accident.
Replace lost valve caps to re­
duce the risk of damage to the
tire valves.
Tire pressure that is too low in­ creases fuel consumption.
Audi recommends using the
tire pressure specified for a
normal load c:::>
table on
page 248
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 .
247

Wheels
Tire pressure
Model/ Tire designation Normal load Maximum load
Engine (up
to
2*/3 people)a>
front rear front rear
PSI kPA PSI kPA PSI kPA PSI kPA
A8/A8 L : 235/55 Rl8 104H
35 240 32 220 36 250 38 260
3.0L
255/45 Rl9 104H 35 2
4 0
32 22 0 36 25 0 38 2 60
6 cylinders 265/40 R20 104H 35 24 0 32 220 36 250 38 260
265/40 R20 104V 33 2
30 32 22 0
33 2
30
35 240
275/35 R21 103Y
XL 35 240 32 220 36 250 35 240
A8/A8 L: 235/55 Rl8 104H 35 240 32 22
0
38 26
0
38 26
0
4.0L
255/45 Rl9 104H 35 240 32 220 38 260 38 260
8 cylinders 265/40 R20 104H 35 240
32 220
38 260
38 2
60
265/40 R20 104Y 33 230 32 220 35 240
35 240
275/35 R21 103V XL 35 240 32 2 20 38 260
38 260
AB L: 265/40 R20 104Y 35 240 32 220 36 250 35 240
6.3L
255/45 Rl9 104H 36 25 0 32 2 20
39 270 38 260
12 cylin-265/40 R20 104H 36 25
0 32 220 39 270 38 260
ders
275/35 R21 103Y XL 35 24 0 32 220 36 250 35 240
58: 265/40 R20 104Y 36 250 32 22 0 39 27
0
38 260
4.0L 265/35 R21 101 Y 39 270 35 240 44 300 42 290
8 cylinders 275/35 R21 103V XL 39 27
0
35 2
4 0 4 4
300 42
290
a) Vehicles with 4 seating positions: two people in the front, Vehicles with S seating
positions:
two people in the front , one person in the rear
A WARNING
Please note the important safe­
ty precautions regarding tire
pressure ¢
page 246 and load
limits¢
page 248.
Tires and vehicle load limits
There are limits to the amount of
load or weight that any vehicle
and any tire can carry. A vehicle
that is overloaded will not handle
well and is more difficult to stop.
248
Overloading can not only lead to
loss of vehicle control, but can al­
so damage important parts of the
vehicle and can lead to sudden
tire failure, including a blowout
and sudden deflation that can
cause the vehicle to crash.
Your safety and that of your pas­
sengers also depends on making
sure that load limits are not ex­
ceeded . Vehicle load includes ev ­
erybody and everything in and on
the vehicle. These load limits are ..,.

Wheels
technically referred to as the vehi- sengers in the vehicle or passen-cle's
Gross Vehicle Weight Rat-gers who are heavier than the
ing ("GVWR"). standard weights assumed mean
The "GVWR" includes the weight that less weight can be carried as
of the basic vehicle, all factory in-luggage.
stalled accessories, a full tank of The Gross Vehicle Weight Rating
fuel, oil, coolant and other fluids and the Gross Axle Weight Rating
plus maximum load. The maxi- are listed on the safety compli-
mum load includes the number of ance sticker label located on the
passengers that the vehicle is in- driver's side B-pillar
c::::> page 246,
tended to carry ("seating capaci-fig. 207.
ty") with an assumed weight of
.&_ WARNING
150 lbs . (68 kg) for each passen-
Overloading a vehicle can cause
ger at a designated seating posi-
loss of vehicle control, a crash
tion and the total weight of any
or other accident, serious per-
luggage in the vehicle. If you tow
sonal injury, and even death.
a trailer, the weight of the trailer
-Carrying more weight than
hitch and the tongue weight of
your vehicle was designed to
the loaded trailer must be includ-
carry will prevent the vehicle
ed as part of the vehicle load.
from handling properly and
The
Gross Axle Weight Rating increase the risk of the loss of
("GAWR") is the maximum load vehicle control.
that can be applied at each of the -The brakes on a vehicle that
vehicle's two axles. has been overloaded may not
The fact that there is an upper be able to stop
the vehicle
limit to your vehicle's Gross Vehi- within a safe distance.
cle Weight Rating means that the -Tires
on a vehicle that has
total weight of whatever is being been overloaded can fail sud-
carried in the vehicle (including denly, including a blowout and
.... the weight of a trailer hitch and sudden deflation, causing loss
N the tongue weight of the loaded of control and a crash. ci ... :c ": trailer) is limited. The more pas-....
'° "? ....
'° ....
249

Wheels
-Always make sure that the to­tal load being transported -
including the weight of a trail ­
er hitch and the tongue
weight of a loaded trailer -
does not make the vehicle
heavier than the vehicle's
Gross Vehicle Weight Rating.
Determining correct load
limit
Use the example below to calcu­ late the total weight of the pas­
sengers and luggage or other
things that you plan to transport
so that you can make sure that
your vehicle will not be overload­ ed .
Steps for Determining Correct
Load Limit
1 . Locate the statement "THE
COMBINED WEIGHT O F OCCU ­
PANTS AND CARGO SHO ULD
NEV ER EXCEED XXX KG OR XXX
LBS"on your vehicle's placard
(tire inflation pressure label)
¢ page 246, fig . 207 .
2. Determine the combined
weight of the driver and pas­sengers that will be riding in
your vehicle .
250
3. Subtract the combined weight
of the driver and passengers
from
"XXX" kilograms or "XXX"
pounds shown on the sticker
¢ page 246, fig . 207 .
4. The resu lting fig ure equals the
available amount of cargo and luggage load capacity . For ex­
ample, if the "XXX" amount
equals
1400 lbs. and there will
be five
150 l bs . passengers in
your vehic le, the amount of
available cargo and luggage load capac ity is
650 lbs .
(1400-750 (S x 150) = 650
lbs.)
5. Determine the combined
weight of luggage and cargo
being loaded on the vehicle .
That weight may not safely ex­
ceed the available cargo and luggage load capacity calcu lat­
ed in Step 4.
6 . If your vehicle will be towing a
trailer, load from your trailer
w ill be transferred to your ve­
hic le. Consu lt th is manua l to
determine how this reduces
the available cargo and lug­
gage load capacity of yo ur vehi-
cle.
~

.,.Che ck th e tir e s idewall
(c:::> page 2 3 6, fig. 205 ) to deter­
min e th e des ig nated load r atin g
for a spec ific tir e.
Wheel bolts and rims
Wheel bolts
Wheel bolts must be clean and loosen/t ighten
easi ly.
Rims
R ims with a bolted rim ring* or with bolted wheel
covers* consist of m ultip le pieces. These compo­
n ents were bolted toge ther using specia l bolts
a nd a specia l procedu re. You must not repair or
disassemble them¢
A.
A WARNING
Wheel bolts that are t ightened or repaired in­
co rrectly can become loose and result in loss
of vehicle control, which increases the risk of
an acc ident. For the correct tightening specifi­
cation, refer to¢
page 260.
-Always keep the wheel bolts and the
threads in the whee l hub clean and free of
grease.
- Only use wheel bolts that fit the rim.
- Always have damaged r ims repaired by an
authorized Audi dealer or authorized repair
facility. Never repair or d isassemble rims
yourself, because th is increases the r isk of
an acc ident .
Winter tires
W inte r tires s ignificantly improve the vehicle's
h andling when d rivi ng in winter condit ions. Be­
cause of the ir constr uction (width, compound,
t read pattern), summe r ti res provide less trac­
tion on ice and snow.
"'U se winte r tir es on all four wheels.
"' Only use winter t ires that a re approved for your
vehicle.
"' Please note that the maximum permitted
speed may be lower with winter tires
¢ &, .
Wh eel s
Your authorized A udi dealer or authorized re­
pair facility can inform you about the maximum
permitted speed for your tires.
"' Check the tire pressure after insta lling wheels
¢page 246.
The effectiveness of winter tires is reduced great­
ly when the tread is worn down to a depth of
0.157 inch (4 mm). The characteristics of winter
tires also decrease greatly as the tire ages, re­ gardless of the rema ining t read .
A WARNING
'---
-Never d rive faster than the max imum pe r­
mitted speed for your tires. This could ca use
the t ires to heat up too mu ch. This in cr eases
the r isk of an accident because it can ca use
the t ire to burst.
- Always adapt your driving to the road and
traffic cond itions. Drive carefully an d reduce
your speed on icy or slippery roads. Even
winter t ires can lose tract ion on black ice.
@ For the sake of the environment
Reinsta ll summer tires a t the app ropr iate
time, beca use they prov ide bette r handling
when roads are free of snow and ice . Summer
tires cause less road noise, tire wear and fue l
consumpt ion.
(D Tips
You can also use all season tires instead of
winter tires . Please note that in some coun ­
tries where winter tires are required, on ly
winter tires w ith the
& symbo l may be per­
mitted.
Snow chains
Snow chains improve traction in the snow.
"' On ly install snow chains on the front wheels.
"' Check and co rrect the seating of the snow
chains if necessary after driving a few feet. Fol­
low the instructions from the manufacturer.
"' Note the maximum permitted speed when dr iv­
ing with snow chains. Do not exceed 30 mph
(SO km/h) . ...
251

Wheels
Snow chains not only improve the driving in win­
ter road conditions, but also the broking.
Use of snow cha ins is o nly pe rm itted with certain
r im/t ire combinations due to tec hni cal reasons.
Check with an authorized Audi dealer or author­
ized repair faci lity to see if yo u may use snow
cha ins .
The snow c ha ins must have
low-profile lin ks and
m ust not be thicker than 0 .4 inch (10.S mm), in ­
cluding the lock.
You mus t remove the c hains whe n driving on
roads that are
free of snow. When roads are free
of snow, snow c hains can impair handling and
damage the tires, and the chains wi ll quickly be
destroyed .
_& WARNING
Using inco rrect snow chains or insta lling snow
chains incorrectly can result in loss of vehicle
cont rol, which inc reases the risk of an acc i­
dent .
{CT) Note
-Snow cha ins can damage the rims/wheel
covers* if the chains come into d irect con­
tact with them . Remove the wheel cove rs*
first. Use coated snow chai ns.
- Using snow chains that add more than 0.4
inch (10.5 mm) of he ight can severely dam­
age the wheel hous ings and other vehicle
components.
- Do not i nstall and use snow chai ns if there is
a malfunct ion in the adaptive air suspen­
s io n, because the vehicle he igh t will be very
l ow. If you drive wi th snow ch ains anyw ay,
the wheel ho usings and other vehi cle com ­
ponen ts can be severely damaged .
(D Tips
When using snow chains, it m ay be useful t o
sw itch on sport mo de
¢page 192.
Low aspect ratio tires
Your Aud i is factory-equipped with low aspect ra ­
tio tires . These ti res have been tho roughly tested
252
and been sele cted specifica lly for your mode l for
their superb performance, road fee l and hand ling
u nder a var iety of dr iv ing cond it ions. Ask your au ­
thori zed Audi dea ler fo r more details.
The low aspect rat io o f these tires is indica ted by
a n umera l of
55 or less in the tire's size designa­
t ion . The n umera l represents the ratio of the
tire's sidewall height in relation to its tread width
expressed in percentage. Convent iona l tires have
a height/width ratio of 60 or more .
The performance of low-aspect-ratio tires is par­
t ic ularly sensitive to improper inflation pres ­
sure.
It is the refore important that low aspect
ratio tire s are inflated to the specified pressure
and that the inflation pressur e is regularly
checked and maintained . T ir e pressures should
b e c hec ked at l east on ce a month and alway s
befor e a long trip
¢ page 246.
What you can do to avoid tire and rim
damage
Low aspect ratio tires can be damaged more eas i­
l y by impact with potholes, curbs, gullies or
ridges on the road, particularly if the tire is un­
derinflated.
In orde r to mi nimi ze the occur rence of impact
dam age to the tires of yo ur vehicle, we recom ­
mend tha t you observe the following preca u­
tions:
- Always ma intain recommended i nflation pres­
sures. Check yo ur tir e pressure eve ry 2,0 00
m iles (3,000 km) and add air if necessary .
- Dr ive ca refully on roads w ith potholes, deep
gullies o r ridges. The impac t from dr iv ing
through or over such obstacles can damage
your tires. Impact with a curb may a lso ca use
damage to your ti res.
-After any impact, immediate ly inspect you r
tires or have them inspected by the nearest au­
thorized A udi dealer. Replace a damaged tire as
soon as possible.
- Inspect your tires every 2,000 mi les (3,000 km)
for damage and wear. Damage is not always
easy to see . Damage can lead to loss of air and
underinflation, wh ich could eventually cause
tire fa ilure . If you be lieve that a tire may have .,.