wheel size AUDI S6 2012 Owners Manual

148 Airbag system
-The Advanced Airbag System can deploy
in accordance with the .,low risk" option
for 3- and 6-year-old children under the U.S . Federal Standard if a child with elec­
trical capacitance greater than the com­ bined capacitance of a typical one-year
old infant restrained in one of the for­
ward facing or rearward-facing child
seats with which your vehicle was certi­
fied is on the front passenger seat and
the other conditions for airbag deploy­ ment 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
c::> page 170, Child restraints and
Advanced front airbag system.
"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
i=>page 170,
-When a person is detected on the front pas­
senger seat that has an electrical capaci­
tance that is more than the total 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
with which the Advanced Airbag System in
your vehicle was certified) , the front airbag
on the passenger side may or may not de­
ploy.
The
PASSENGER AIR BAG OFF light comes on
when the electronic control unit detects a to­
tal electrical capacitance on the front passen­ ger seat that requires 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 an impact that meets the condi -
tions stored in its memory. ..,_

1 70 Child Safety
c::> page 168, 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 WARN­
INGS. Make certain that the child and child re­
straint are correctly recognized by the capaci­
tive passenger detection system in the front passenger seat, that the front passenger air­
bag is turned off, and that the airbag status is .,.

pressed considerably harder to make up
for the lack of booster assistance.
Electro-mechanical
power assist
The electro-mechanical power assist helps
the driver when steering.
Power steering adapts electronically based on
the vehicle speed .
Indicator lights and messages
• Steering defective! Stop the vehicle
If this indicator light turns on and stays on
and this message appears, the power steering may have failed.
Do
not continue driving. See your authorized
Audi dealer or other qualified repa ir facility
for assistance.
t -r- fl Steering: System malfunction! You may
c ontinue driving
If the indicator light turns on and the mes­
sage appears, the steer ing may be more diffi­
cult to move or more sensitive than usual.
Drive slowly to your authorized Audi dealer or
qualified workshop to have the malfunction
corrected.
@ Tips
If the . or t~fl indicator light only stays
on for a short time, you may continue driv­
ing .
Driving with your
quattro ®
Applies to vehicles: with all-wheel drive
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 driving sty le and the road
conditions at the time. See also¢
page 189. Intelligent technology 193
T
he all -whee l dr ive concept is designed for
high engine power. Your vehicle is exception­
ally powerfu l and has excellent driving charac­
teristics both under normal driving conditions
and on snow and ice. Always read and follow
safety precautions¢ ,&..
Winter tires
When driving in the winter, your vehicle with
all-wheel drive has an advantage, even w ith
regular 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¢ page 250, Winter tires.
Tire chains
Where tire chains are mandatory on certain
roads, this normally also applies to vehicles
with all-wheel drive¢
page 251, Snow
chains .
Replacing wheels/tires
Vehicles with a ll-wheel drive must always
have tires of the same size. Also avoid tires
with different tread depths. For deta ils see
page ¢
page 246, New tires and replacing
tires and wheels.
Off-Road driving?
Your Audi 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
¢page 197 .
A WARNING
Always adjust your dr iv ing to road and traf­
fic 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 limited by tire traction. You
should therefore not drive at excessive
speeds on icy or slippery road surfaces.
•
•

236 Tires and wheels
-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 tire failure
and loss of vehicle control.
Glossary of tire and loading terminology
Accessory weight
means the comb ined weight (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) .
Aspect ratio
means the ratio of the he ight to the w idth of
the tire in percent. Numbers of 55 or lower in­
dicate a low sidewall for improved steering re­
sponse and better overall handling on dry
pavement.
Bead
means the part of the tire that is made of
steel wires, wrapped o r reinforced by ply cords
and that is shaped to fit the r im.
Bead separation
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 recommended by the
vehicle manufacturer for a tire of a designated size that has not been driven for more than a
couple of miles (kilometers) at low speeds in
the three hour period before the tire pressure
is measured or adjusted. -
If you notice unusual vibration or if the
veh icle pulls to one side when driv ing, a l­
ways stop as soon as it is safe to do so and check the wheels and tires for dam­
age.
Curb weight
means the weight of a motor vehicle w ith
standard equipment including the maximum
capacity of fuel, oil, and coolant, air condi­
tioning and additional weight of optiona l
equipment.
Extra load tire
means a t ire design to operate at h igher loads
and at higher inflation pressures than the cor­
responding standard tire. Extra load tires may
be identified as "XL", "xl", "EXTRA LOAD", or
"R F" on the sidewall .
Gross Axle Weight Rating ( "GAWR ")
means the load-carrying capacity of a s ingle
axle system, measured at the tire-ground in­
terfaces .
Gross Vehicle Weight Rating ("GVWR")
means the maximum total loaded weight of
the vehicle.
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. Yo u
may not find this information on all tires be­
cause it is not required by law.
Maximum load rating
means the load rating for a tire at the maxi­
mum permissib le inflation pressure for that
tire.

Maximum loaded vehicle weight
means the sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight, 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 pressu re."
Normal occupant weight
means 150 lbs. (68 k ilograms) 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 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.
Ply
means a layer of rubber-coated para llel cords.
Production options weight
means the comb ined weight of those installed
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 weight, including
heavy duty brakes, r ide leve lers, roof rack,
heavy duty battery, and specia l trim .
Radial ply tire
means a pneumatic t ire in which the p ly cords
that extend to the beads are laid at substan­
tially 90 degrees to the centerline of the
tread.
Tires and wheels 237
Recommended inflation pressure
see~
page 236, Cold tire inflation pressure.
Reinforced tire
means a t ire design to operate at higher loads
and at higher inflation pressures than the cor­
responding standard tire. Reinforced tires
may be identified as "XL ", "x l", "E XTRA LOAD",
o r "R F" on the sidewall.
Rim
means a metal support for a tire or a t ire and
tube assembly upon which the tire beads are
seated.
Rim diameter
means nom inal d iameter of the bead seat. If
you change your wheel s ize, you w ill have to
purchase new tires to match the new r im di­
ameter.
Rim size designation
means r im diameter and width.
Rim width
means nom inal distance between rim fla nges.
Sidewall
means that portion of a tire between the
tread and bead.
Speed rating (letter code)
means the speed at which a tire is designed to
be driven for extended periods of time. The
ratings range from 93 mph (150 km/h) to
186 mph (298 km/h)
~ page 247 . You may
not find this information on all tires because
it is not requ ired by law.
The speed rating letter code, where applica­
ble, is molded on the tire sidewall and indi­
cates the max imum pe rm issib le road speeds
~ .&. in Winter tires on page 251.
Tire pressure monitoring system*
means a system that detects when one or
more of a veh icle's tires are underinflated and
illuminates a low tire pressure warning tell­
tale.
•
•

Tires and wheels 239
Cold tire inflation pressure
Tire pressure affects the overall handling, performance and safety of a vehicle .
Fig . 1 78 Tir e pr essur e labe l: located on drive r's s ide B ·
p ill ar
Tire pressu re genera lly refers to the amount
of air in a t ire tha t 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 i nterna­
tional measuring unit and in pounds pe r
square inc h (PSI). Tire pressure is based in
pa rt o n the vehicle's desig n an d load limit­
the greatest amount of weight that the vehi­
cle can carry safe ly and the ti re size . The prop ­
er tire pressure is freq uent ly referred to as the
"recommended cold tire inf lation pressure ."
Air in the tires expands when the tire heats up
because of interna l frict io n when it flexes in
use . The ti re p ressu re is higher when the tire
has warmed up than when it is "cold ." It is the
i nflat io n pressure i n a "cold" tire that counts.
Therefo re, you s ho ul d never let air ou t of a
warm tire to match " cold tire infla tion p res­
sure" recommendations . The tires wo uld then
be underinf lated a nd could fail suddenly.
M ain taining proper t ire press ure is one of the
most impor tan t thi ngs you c an do to he lp
avoid sudden tire failure. Underinfla ted tires
are a major cause of s udden tire failure . Keep­
ing tires at the r ight pressure is also impor­
tant for safe and responsive vehicle handling,
traction, b rak ing and load carrying .
Tire pres­
sures are part icularly important wh en th e
vehicle is being driven at higher speeds , and
then especially when h eavily loaded even
within the permi ssible load -carrying capaci­
tie s approved for your vehi cle.
~
"' ~
,.------------------- ~
•(=~: I := I ~ I )§ :ll
,.,,. ........................ ...., .... ~----.... _ ... t.._.. .... _..,.. .... ......,... .. ~--......... ·- ..
- KPA. . PSI
- KPA. . PSI
- KPA. . PSI
Fig. 17 9 Tir e pressu re labe l
The recommended tire pressures for your Audi
depe nd on the kind of tires on your ve hicle
and t he number of passe ngers and/or amount
of luggage you w ill be t ransporting .
The tire pressure label is located on the driv­
er's side 8-pillar . The tire pressure labe l lists
the recommended cold t ire inflat io n pressures
for the veh icle at its maximum capac ity
weight and tires that we re o n your veh icle at
t h e time it was manufactu red.
If you wish to improve comfort when op erat­
ing the ve hicle at normal load (up to 3 occu­
pant s), you can adju st tire pres sures to those
spe cified for normal vehi cle load . Before op­
erating the vehicle at maximum load, you
must increase the tire pressure s to those
speci fied for maximum vehicle load
¢ .&.
Bear in mind that the tire pressure mon itor ing
system* can on ly mon itor the tire p ress ures
yo u have sto red. The sys tem does not recog ­
nize the load condi tion of your veh icle.
T he effectiveness of the t ire p ress ure monitor­
ing system * w ill be impa ired i f you s to re no r­
m al load pressures but t hen opera te the veh i­
cle a t its maximum load
¢ .& .
See the ill ustration 9 fig. 178 fo r the lo cat ion
of the label o n driver's s ide B-pillar (color of
the actu al label a nd exact lo cat ion on the ve­
hicle will vary s light ly).
Note t hat the follow ing table is accu rate at
the time of going to press and is s ubject to

240 Tires and wheels
change. In the event of discrepancies, the tire
pressure labe l is located on the driver's side B­
p ill ar a lways takes precedence.
The table below lists the recommended cold
tire inflation pressures for the Audi model covered
by your Owner's Literature at the vehi ­
cle's capacity weight and the tire sizes instal­
l ed on the respective models as orig inal
equipment, or as a factory option.
I Engine Tire designation Tire pressure front Tire pressure rear I
(displace-
normal load full load normal load full load
ment
in li-condition condition condition condition
I
ter) PSI II kPA PSI JI kPA PSI II kPA PSI II kPA :
4-cylinder 225/55 Rl 7
97H
2.0 All 5eason
32 220 35 240 29 200 38 260
245/45 Rl8 lOOH XL '
32 220 35 240
29 200 38 260 All Season I
255/40 Rl9 lOOH XL
32 220 35 240 29 200 38 260
All Season
255/40 Rl9 lOOY XL
30 210
33 230
30 2 10 36 250
High Performance
255/35 R20 97V XL
35 240 38 260 32 220 41 280
High Performance
I 6-cylinder 225/55 Rl7
97H '
35 240 38 260 32 220 41 280
3.0 All Season .. -. • .. .. .. .. ..
All Season 35 240 38 260 32 220 41 280
245/45 Rl8 100H XL
255 /40 R19 lOOH XL
'
35 240 38 260 32 220 41 280 All Season I
255/40 Rl9 lOOY XL 36 250
39 270
33 230 42 290
High Performance
255/35
R20 97V
XL '
39 270 44 300 36 250 46 320
High Performance
I
XL= reinforced or extra load tire. It may also appear as xl, EXTRA LOAD, or RF on the tire side­
wall.
The correct tire pressure for the
spare wheel i s
located on a label on the driver's side B-pillar.
Because technical changes may be made to
vehicle equipment during the model year, a l­
ways compare the tire size designation on the
tire pressure label on your vehicle 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 t ires on the vehicle.
This is especia lly important if the vehicle be­
l ongs to someone else or you bought the veh i­
cle with 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 making sure that load limits are not exceeded. Vehicle load in­
cludes everybody and everything in and on the
vehicle . These load limits are techn ically refer­
red to as the veh icle's Gross Vehicle Weight
Rating ("GVWR"). The Gross Axle We ight Rat­
i ng ("GAWR") is the maximum load that can
be applied at each of the vehicle's two axles.
The Gross Vehicle Weight Rating and the
Gross Axle Weight Rating are listed on the
safety comp liance sticker label located on the
driver's side B-pillar . The tire pressure label on .,.

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. 180 Tire tread: tread wea r ind ica tors (TWI)
Fi g. 18 1 Rotat ing t ires fo r m ore even wea r
Tread Wear Indicator (TWI)
The origina l tires on your veh icle have
1/16 in ch (1.6 mm) high "wear ind icators"
M ....
9 <.7
~
c::> fig . 180 run ning across the tread. Depend ­
ing on the make, there will be six to eight of
them evenly p laced around the t ire . Marks on
the t ire s idewall (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 other countries
c::> & .
Tir e pressure
Incorrect tire pressure causes premat ure wear
and can cause sudden tire blow-out . For th is
reason, tire pressure must be checked at least
once a month
c::> page 241.
Dri ving sty le
Driving fast around curves , heavy acceleration
and hard braking increase tire wear. Tires and wheels 245
Rotating tires for more even wear
For all four tires on your ve
hicl e to have the
same service life, we recomme nd that the
front and rear tires are rotated according to
the tire manufacturer 's suggested tire rota­
tion inte rvals. Please remember the follow ­
ing :
- Tire rotation intervals may differ from the
veh icle 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 you
follow the tire manufactu rer 's suggested
tire rotation intervals .
- Vehicles w ith front-wheel dr ive exper ience
more tread wear on the front wheels com­
pared to all -wheel d rive (quattro ®).
- Please rotate tires as shown
c::> fig. 181.
-Extra care must be taken when rotat ing di-
rection-specific tires
c::> page 263 .
Wheel balancing
The wheels on new veh icles are balanced .
However, various situations during everyday
driving can cause them to become unba l­
anced, resulting in vibrat ions you can usually
feel through the steer ing wheel.
Unbalanced wheels must be rebalanced to
avoid excessive wear on steering, s uspension
and t ires. A whee l must also be reba lanced
when a new tire is insta lled.
Inco rrect wheel alignment
Incorrect wheel alignment can cause exces­
sive tire wear, impair ing the safety of the vehi­
cle . If tires show excessive wear, have the
whee l alignment checked by an authori zed
Audi dealer or qualified workshop.
All-whe el drive
Vehicles wi th quattro ® mus t always have tires
of the same size, construction and tread type. For details see
c::> page 193.

248 Tires and wheels
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)
1l
Z over 149 mph (240 km/h)ll
W up to 168 mph (270 km/h)ll
Y up to 186 mph (298 km/h)l)
Your veh icle is normally factory equipped with
tires , which possess excellent driving charac­
teristics and give your Audi opt imum driving
comfort. An electronic speed limiter
c:> page 29 will normally prevent your vehicle
from going faster than the tire speed rating
c:> & .
U.S . DOT Tire Identification Number (TIN)
and tire manufacture date
This is the tire'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 manufactured, and the last four numbers
r epresent the week and year of manufacture.
F or example, the numbers 2211 mean the tire
was produced in the 22nd week of 2011. 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 tire defect requires a recall.
Audi Original tire
Tires with the identification "AO" or "RO" have
been specially matched with your Audi . We
recommend using only these tires because
they meet the highest standards regarding
safety and driving characteristics when used
correctly . Your authorized Audi dealer will
gladly provide you with more information .
Tire ply composition and materials used
The number of plies indicates the number of
layers of rubber-coated fabric in the tire. In
general, the greater the number of plies, the more weight a tire can support . Tire manufac -
ll F t· "t h . or ires w 1 a m ax im um s pee d ca pabil ity ove r
1 4 9 mp h (240 k m/h) , tire man ufactur ers sometimes
use the lette rs " ZR."
turers also must indicate the materials in the
tire, which include steel, nylon, polyester, and
others .
Maximum Load Rating
Th is number ind icates the maximum load in
kilograms and pounds that can be carr ied by
the tire.
Tire quality grading for treadwear,
traction , and temperature resistance
Tread wear, traction and temperature grades
c:> page 249.
Maximum Permissible Inflation Pressure
This number is the greatest amount of a ir
pressure that should ever be put in the tire
un der normal driv ing conditions .
_& WARNING
= -
- Using incorrect or unmatched tires and/
or wheels or improper tire and wheel
combinations can lead to loss of control
collision and serious personal in jury.
'
-Always use tires, rims and whee l bolts
that meet the specifications of original factory-installed tires or other combina­
tions that have been specifically ap­
proved by the vehicle manufacturer.
- 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 w ith special care and at lower
speeds.
- Never mount used tires on your veh icle if
you are not sure of the ir "previous histo­
ry." Old used tires may have been dam­
aged even though the damage cannot be
seen that can lead to sudden tire fa ilure
and loss of vehicle control.
- All four whee ls must be fitted with radial
tires of the same type, size (rolling cir­ cumference) and the same tread pattern . ..,_

250 Tire s and wheel s
Traction
The traction grades, from highest to lowest,
are AA, A, Band
C. T hose 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
c:> .&. .
Te mp eratu re
The temperature grades are A (the highest),
B, and
C, representing the t ire's resistance to
the generat ion of heat and its ability to dissi­
pate heat when tested under con trolled cond i­
tions on a specified i ndoor 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 failure
c:> ,& .
The grade C corresponds to a level of perform­
ance which all passenger car tires must meet under the Federa l Motor Veh icle Safety Stand­
ard No .
109 . Grades Band A represent h igher
l eve ls of pe rformance on the laboratory test
wheel than the m inimum required by law.
.&_ WARNING
T he traction grade assigned to this t ire is
based on stra ight-ahead braking traction
tests, and does not include acceleration,
cornering, hydrop laning o r 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 ove rloaded. Excessive speed, un­
derinflation, or excessive loading, either
separately or in combination, can cause
heat buildup and possible ti re fa ilu re.
-
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" t ires , those
with very deeply cut tread . Th ese tires should
o n ly be used in pairs and be installed on a ll
f o ur wheels . Make sure you p urch ase snow
t ir es that are the same size and cons truction
type as the othe r tires on yo ur vehicle.
If your vehicle i s equ ipped w ith all-whee l
drive*, t his w ill improve tr action d uring win ter
driv ing, even with the standard tires . Howev ­
er, we strongly recommend that you always
equip all four wheels on your vehicle 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 brak ing per­
formance and reduces stopping d istances .
Summer tires provide less grip on ice and
snow.
Winter tires (snow tires) must always be fitted on all fo ur whee ls .
As k your au thori zed A udi dealer or qualified
workshop for permit ted
winter tire size s. Use
only radial winter tires .
Winter tires lose their effec tivenes s whe n the
tread is wo rn down to a depth o f
0.1 57 inch
(4 mm) .
Only d rive w ith w inter t ires under w inte r co n­
di tions. S umme r tir es handle be tte r whe n
the re is no snow o r ice on the roa ds and the
temperatu re is above 45 °F (7 °C) .
If you have a flat ti re, see notes on spare
whee l
c:> page 246 .
Please always remember that winter tires may
have a lowe r speed rating than the tires o rigi­
nally i nstalled on your vehi cle at the time it
was manuf actu red. P lease see
c:> page 247,
Speed ra ting (Letter code)
fo r a lis ting o f the
speed rating lette r codes and the max imum
speed at which the tires can be driven . ..,.