2011 AUDI S8 wheel

Tires and wheels 241
Tread
means that portion of a tire that comes into
contact with the road.
Tread separation
means pull ing away of the tread from the tire
carcass .
Treadwear indicators (TWI)
means the projections within the principal
grooves designed to give a visual indication of
the degrees of wear of the tread. See
c:> page 248, Tread Wear Indicator (TWI) for
more informat ion on measuring tir e wear.
Uniform Tire Quality Grading
is a tire information system developed by the
United States National Highway Traffic Safety
Administration (NHTSA) that is designed to help buyers make relative comparisons among
tires. The UTQG is not a safety rating and not a
g uarantee that a tire will last for a prescribed
number of mi les (kilometers) or perform in a
certain way.
It simply gives tire buyers addi ­
tional information to combine with other con­
siderat ions, such as pr ice, brand loya lty and
dealer recommendations. Under UTQG, tires
are graded by the tire manufacturers in three
areas : treadwear, traction, and temperature
res istance . The UTQG information on the tires,
mo lded into the sid ewa lls.
U.S . DOT Tire Identification Number (TIN)
This is the t ire's "serial number" It begins
with the letters "DOT" and indicates that the tire
meets all federal standards. The next two
numbers or letters indicate the plant where it
was man ufactured, and the last four numbers
represent the week and year of man ufacture.
For example,
DOT . .. 2212 ...
means tha t the tire was produced in the 22nd
week of 2012. The other numbers are market­
ing codes that may or may not be used by the
tire manufacturer . This information is used to
contact consumers if a tire defect requires a
recall.
Vehicle capacity weight
means the rated cargo and luggage load plus
150 lbs. (68 kilograms) times the vehicle's to­
ta l seating capacity as listed on the label lo­
cated either on the driver's side B-pillar.
Vehicle maximum load on the tire
means that load on an individu al tire that is
de termined by distributing to each axle its
share of the maximum loaded vehicle weight
and dividing by two.
Vehicle normal load on the tire
means that load on an individua l tire that is
determined by distributing to each axle its
share of the curb weight, accessory weight,
and normal occ upant weight (distributed in
accordance with tab le be low
c:> page 241)
and dividing by two.
Occupant loading and distribution for vehicle normal load for various designated seating
capacities
Designated seating capacity,
number of occupants
4
5
Vehicle normal load, number Occupant distribution in a nor-
of occupants _____ mally loaded vehicle
2 2 in front
3 2 in front, 1 in back seat
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242 Tires and wheels
Cold tire inflation pressure
Tire pressure affects the overall handling, performance and safety of a vehicle .
I ± ...
"'
Fig. 184 Tire pressure label: located on driver's side B ·
pillar
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 kilopascals (kPa), the interna·
tional measuring unit and in pounds per
square inch (PSI). Tire pressure is based in
part on the vehicle's design and load limit­
the greatest amount of weight that the vehi·
cle can carry safely and the tire size. The prop·
er tire pressure is frequently referred to as the
"recommended cold tire inflation pressure."
A ir in the tires expands when the tire heats up
because of internal friction when it flexes in
use. The t ire pressure is higher when the tire
has warmed up than when it is "cold ." It is the
inflation pressure in a "cold " tire that counts.
Therefore, you should never let air out of a
warm tire to match "cold tire inflat ion pres­
sure" recommendations. The tires would then
be underinflated and could fail suddenly.
Maintaining proper tire pressure is one of the
most important things you can do to help
avoid sudden tire failure. Underinflated tires
are a major cause of sudden tire failure. Keep­
ing tires at the right pressure is also impor­
tant for safe and responsive vehicle handling,
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.
------------------.. ,;
•(=~: I : I :,.. I)@ ~
The~-----~---w-o- ....... -e.....i -·· - ­u ........ -.-..,.0, ... -....,.,...tot~---....... ._.,. -..
....
-..... ...........
- KPA. a PSI
- KPA.
a PSI
-KPA. a PSI
Fig. 185 Tir e pressure label
SU OWNER'S MANUAl FOR AD0"10NAL l10N VOl!ILEMANU£1. DU _,...,
POUR Pl.US DE
REHSEKi.\'IEME NTS
The recommended tire pressures for your Audi
depend on the kind of tires on your veh icle
and the number of passengers and/or amount
of luggage you will be transporting .
The tire pressure label is located on the driv­
er's side B-pillar . The tire pressure label lists
the recommended cold t ire inflation pressures
for the vehicle at its maximum capac ity
we ight and tires that were on your veh icle at
the 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
c::> .&,.
Bear in mind that the tire pressure mon itor ing
system* can only monitor the tire pressures
you have stored. The system does not recog­
nize the load condition of your vehicle.
T he effectiveness of the tire pressure monitor­
ing system* will be impa ired if yo u store nor­
mal load pressures but then operate the vehi­
cle at its maximum load
c::> .&..
See the ill ustration c::> fig. 184 fo r the locat ion
of the label on driver's side B-pillar (color of
the actua l lab el and exact lo cation on the ve­
hicle will vary slightly).
Note that the following table is accurate at
the time of going to press and is subject to

Tires and wheels 243
change. In the event of discrepancies, the tire
pressure label (On USA vehicles, the tire pres­
sure label is located on the dr iver's side B -pil­
lar always takes precedence.
The table be low lists the recommended cold
tire inflation pressures for the A udi model covered
by your Owner 's Literat ure at the vehi­
cle's capacity weight and the ti re sizes instal­
l ed on the respective models as orig inal
equipment, or as a factory option.
Engine Tire designation Tire pressure front Tire pressure rear
(displace- normal load full load normal load full load
ment in
li-conditiona l
condition conditional
condition
ter) kPA PSI kPA PSI kPA PSI kPA
a-cylinder 235/55 Rla 104H XL all
35 240 36 250 32 220 38 260 4.2
season
255/45 R19 104H XL all
240 36 250 32 220 38 260
season
265/40 R20 104V XL
33 230 33 230 30 210 35 240
a-cylinder 235/55 R18 104H XL all 240
36 250 32 220
38 260
4.2L season
255/45 R19 104H XL all
35 240 36 250 32 220 38 260 season
265/40 R20 104V XL 240
XL= reinforced or extra load tire. It may also appear as xl, EXTRA LOAD, or RF on the tire side-
wall.
al normal load co ndit io n c:, page 24 1.
The correct tire pressure for the spore wheel is
located on a label on the driver's side B-p illar.
Because technical cha nges may be made to
vehicle equipment during the model year , a l­
ways compa re the tire size designation on the
tire pressure label on your ve hicle with the
tires on your vehicle . Make sure that the tire
size information on the vehicle label is the
same as the size of the tires on the vehicle.
T his is especially important if the vehicle be­
longs to someone else or you bought the vehi­
cle wi th different rims/ tires or you bought the
vehicle as a previously owned vehicle .
Remember, your safety and that of your pas­
sengers also depends on mak ing sure that
load limits are not exceeded. Vehicle load in­
cludes everybody and everything in and on the
veh icle. These load lim its are technically refer­
red to as the vehicle's Gross Vehicle Weight
Rating ("GVWR"). The Gross Axle Weight Rat­
in g ("GAWR") is the maximum load that can be applied at each
of the vehicle's two axles.
T he Gross Vehicle Weight Rating and the
Gross Axle Weight Rating are listed on the
safety compliance sticker label located on the
driver's side B-pillar . The tire pressure labe l on
your Audi lists the maximum combined
weight of all of the occupants and luggage or
other cargo tha t the veh icle can carry . For the
location of the tire pressure label
c::> fig. 184.
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 your vehicle
was designed to carry will prevent the
vehicle from handling properly and in­ crease the risk of a loss of vehicle con­
trol.
•
•

Remember that the vehicle manufacturer, not
the tire manufacturer, determines the correct
tire pressure for the t ires on your vehicle.
It is impor tan t to check the tire pressu re when
the t ires a re cold .
- Read the requ ired ti re p ressure from the tire
pressure label. On USA veh icles, the t ire
pressure label is located on the drive r's side
B-pi llar . On Canada vehicles, the tire pres ­
sure label is located on the driver's side B­
pillar.
- Turn the valve stem cap counter-clockwise
to remove it from the tire valve.
- Place the air pressure ga uge on the valve.
- T he tire pressures sho uld only be chec ked
and adjusted when the t ires are cold. The
s li ght ly raised pressures of warm tires must
not be reduced .
- Adjust the tire pressure to the load you are
ca rrying .
- Re insta ll the va lve stem cap on the valve.
When should I ch eck the tire pressur e?
The cor rect tire pressure is espec ially impor­
tant at high speeds. The pressure should
therefo re be checked at least once a month
a nd a lways before start ing a journey. Do no t
forget to check the tire pressure for the spare
wheel
r:!> page 261 .
When should I adjust the tire pressures ?
Adjust the tire p ressure to the load you are
carry ing. Afte r changing a wheel
or replacing
wheels you have to adjust the tire pressures
on all wheels . In addition, you must then
store the new tire pressures i n the tire pres­
sure monitoring system *
r:!> page 256.
A WARNING
Incorrect tire pressures and/or underinfla­
tion can lead sudden tire failure, loss of contro l, col lision, ser ious persona l injury
or even death.
- When the warning symbo l
[I] appears in
the instrument cluster, stop and inspect
the tires .
Tires an d wheel s 245
-Inco rrect tire pressure and/or underinfla­
tion can cause increased tire wear and
can affect the handli ng of the vehicle and
stopping ability .
- Incorrect tire pressures and/or underin­
flation can a lso lead to sudden t ire fail­
ure, including a blowout and sudden de­
flation, caus ing loss of veh icle cont rol.
- The drive r is responsib le for the correct
tire pressures for all tires on the ve hicle.
The appli cable pressure values a re locat­
ed on a sticke r o n the dr iver's s ide B -pil­
lar.
- Onl y when all tir es on the vehicle are fil­
led to the co rrect p ressu re, the t ire pres­
sure mon itor ing* syste m can work cor­
rectly.
- Th e use of incorrect tire p ress ure v alues
can lead to a cciden ts or o ther d amage.
T herefore it is essential that the drive r
observe the specified tire press ure va lues
for the tires and the correct pressures for
the function of the t i re p ress ure monito r­
ing system*.
- Always inflate t ires to the recommended
and correct t ire pressure before dr iv ing
off.
- Driving with underinf lated tires bend
more, lett ing them get too hot resulting
in tread separation, sudden tire failure
a nd loss of cont rol.
- Excessive speed and/overloading can
cause heat build- up, sudden tire failure
a nd loss of cont rol.
- If the tire pressure is too low or too high,
the t ires will wear prematurely and the
veh icle w ill not handle well.
- If the tire is not flat and you do not have to change a wheel immediately, d rive at
red uced speed to t he nearest servic e sta­
tion to che ck the t ire p ress ure and add
air as req uired.
0 Note
Driving w ithout valve stem caps can cause
damage to the tire valves. To prevent this,
a lways make sure that factory insta lled
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246 Tires and wheels
valve stem caps on all wheels are secure ly
mounted on the valve .
@ For the sake of the environment
Underinflated tires will also increase the
fue l consumption.
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. Overloading
can not only lead to loss of vehicle control, but can also damage important parts of the
vehicle and can lead to sudden tire failure, in­
cluding a blowout and sudden deflation that
can cause the vehicle to crash.
Your safety and that of your passengers also
depends on making sure that load limits are
not exceeded. Vehicle load includes everybody
and everyth ing in and on the vehicle. These
l oad limits are techn ica lly referred to as the
vehicle's
Gross Vehicle Weight Rating
("GVWR").
The "GVWR" includes the we ight of the basic
vehicle, all factory installed accessories, a full
tank of fuel , oil, coo lant and other fluids plus
maximum load. The maximum load includes
the number of passengers that the vehicle is
intended to carry ("seating capacity") with an
assumed weight of 150 lbs (68 kg) for each
passenger at a des ignated seat ing pos ition
and the tota l we ight of any luggage in the ve­
hicle. If you tow a trailer, the weight of the
trailer hitch and the tongue weight of the
l oaded trailer must be included as part of the
vehicle load.
The
Gross Axle Weight Rating ("GAWR") is
the maximum load that can be applied at each
of the vehicle's two axles.
The G ross Vehicle Weight Rating and the
Gross Axle Weight Rating are listed on the
safety compliance sticker labe l located on the
driver's side B-p illar. You r A udi has 5 seat ing
positions, 2 in the front and 3 in the rear for
total seating capacity of 5. Vehicles with pow- er individual rear seats* have
4 seating posi ­
tions,
2 in the front and 2 in the rear for total
seat ing capac ity of
4. Each seating position
has a safety belt¢
page 137, Safety belts.
The fact that there is an upper limit to your
vehicle's Gross Vehicle Weight Rating means
that the total weight of whatever is being car­
ried in the vehicle (including the weight of a
trailer hitch and the tongue weight of the
loaded trailer) is lim ited . The more passen­
gers in the vehicle or passengers who are
heavier than the standard we ights assumed
mean that less we ight can be carried as lug­
gage.
The tire pressure label on your Audi also lists
the max imum combined weight of a ll of the
occupants and luggage or other cargo that
the vehicle can carry. For the location of the
label¢
page 242, fig. 184.
A WARNING ,___
Overloading a vehicle can cause loss of ve­
h icl e contro l, a crash or other accident, se­
rious personal injury, and even death.
- Carrying more weight than your vehicle
was designed to carry will prevent the
vehicle from handling properly and in­
crease the risk of the loss of vehicle con­
trol.
- The brakes on a vehicle that has been
overloaded may not be able to stop the
veh icle with in a safe distance.
- Tires on a vehicle that has been overload­
ed can fail suddenly, including a blowout
and sudden deflation, causing loss of
control and a crash.
- Always make sure that the total load be­
ing transported -including the weight of
a trailer hitch and the tongue we ight of a
loaded trailer -does not make the vehi­
cle heavier than the vehicle's G ross Vehi­
cle Weight Rating.

Determining correct load limit
Use the example below to cal­
culate the total weight of the
passengers and luggage or oth­
er things that you plan to trans­
port so that you can make sure
that your vehicle will not be overloaded.
Steps for Determining
Correct Load Limit
1. Locate the statement "THE
COMBINED WEIGHT OF OC­
CUPANTS AND CARGO
SHOULD NEVER EXCEED XXX KG OR XXX LBS" on your ve­
hicle's placard (tire inflation
pressure label)
¢ page 242,
fig. 184.
2. Determine the combined
weight of the driver and pas­
sengers that will be riding in
your vehicle.
3. Subtract the combined
weight of the driver and pas­ sengers from
"XXX" kilo­
grams or
"XXX" pounds
shown on the sticker
¢ page 242, fig. 184.
4. The resulting figure equals
the available amount of car­
go and luggage load capaci­
ty. For example, if the
"XXX"
amount equals 1400 lbs.
Tires and wheels
and there will be five 150
lbs. passengers in your vehi­
cle, the amount of available
cargo and luggage load ca­ pacity is 650 lbs. (1400-7 50
(5
X 150) = 650 lbs.)
5. Determine the combined
weight of luggage and cargo
being loaded on the vehicle.
That weight may not safely exceed the available cargo
and luggage load capacity
calcu lated in Step
4.
6. If your vehicle will be towing
a trailer, load from your trail­
er will be transferred to your
vehicle. Consult this manual
to determine how this re­
duces the available cargo
and luggage load capacity of
your vehicle.
,...Check the tire sidewall
(¢page 249, fig. 188) to de­
termine the designated load rating for a specific tire.
247
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248 Tires and wheels
Tire service life
The service life of tires depends on a lot of
different things including proper installation
and balancing, correct tire pressure and driv·
ing style.
F ig. 1 86 Tire tread: tread wea r ind icators (TWI)
( r------ ,1
\ ...__ _____ ____,.
F ig. 1 87 Rotat ing t ires for more ev en wea r
Tread Wear Indicator (TWI)
The origi na l t ires on your veh icle have
1/16 inch (1.6 mm) high "wear indicators"
c::> fig . 186 running across the tread. Depend ·
i ng on the make, there will be six to eight of
them evenly p laced around the t ire. Marks on
the tire sidewa ll (for example "TWI" or other
symbols) indicate the positions of the tread
wear ind icators . Worn t ires must be replaced .
Different fig ures may apply in o ther countries
c::> & .
Tire p ressure
Incorrect tire pressure causes premature wear
a nd can cause sudden t ire blow-out. For th is
reason, tire pressure must be checked at least
once a month
c::> page 244 .
Driving style
Driving fast aro und curves, heavy acce leration
and hard braking increase tire wear.
Rotating tires for more even wear
F o r all four tires on your ve hicl e to h ave the
same service life, we recommen d that the
front and rear t ires are rotated according to
the tire manufact urer's suggested tire rota·
tion intervals. Please remember the follow­
ing :
- Tire rotation intervals may differ from the
vehicle service inte rva ls o utlined in your
Warranty
& Maintenance booklet .
- The longer one tire is used in one location
on the vehicle, the more it wears at certain
points; therefore, we recommend that y ou
follow the tire manufacturer's suggested
tire rotation intervals .
- Veh icles w ith front-wheel dr ive experience
more tread wear on the fro nt w heels com·
pa red to all-wheel drive (quattro ®).
- Please rotate tires as shown
c::> fig. 187.
-Extra care must be taken when rotating di·
rection-specific tires
c::> page 267 .
Wheel balancing
The wheels on new ve hicles are balanced .
However, various situations during eve ryday
driving can cause them to become unba l·
anced, resulting in vibrat ions you can usually
feel t hrough the steer ing wheel.
Un balanced whee ls must be rebalanced to
avoid excessive wear on steering, suspension
and t ires. A whee l m ust also be reba lanced
when a new tire is insta lled.
Incorrect wheel alignment
Incor rect wheel alig nment can cause exces­
sive tire wear, impai ring the safety of the veh i·
de . If tires show excessive wear, have the
whee l alignment checked by an authorized
Audi dealer or qualif ied workshop .
All Wheel Drive
Vehicles with q uattro ® mus t always have tires
of the same size, construction and tread type .
For details see
c::> page 194 . ..,.

A 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 t ires.
- Tires age even if they are not be ing used
and can fail suddenly, especially at high
speeds . Tir es 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 loss of vehicle control.
Tires and wheels 249
New tires and replacing tires and wheels
New tires and wheels have to be broken in .
Fig. 188 Tir e specificat ion codes on t he s idewall o f a
tire
No. Description
CD Passenger car tire (where applicable)
@ Nominal w idth of tire in millimeters
® Ratio of height to width (aspect ratio)
© Radial
® Rim diameter code
® Load index and speed rating
(f) U.S. DOT tire identification number
® Audi Origina l tire
® Sever snow conditions
@ T ire 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 spec ially matched to the charac­
teristics of the vehicle and can make a major .,.
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