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2 4 2
T ire s and w heel s
Where snow chains are mandatory oncer-
tain roads, this normally also applies to
veh icles with all-wheel dr ive.
Wheel bolts
Wheel bolts must always be tightened to the
correct torque .
The design of whee l bolts is matched to the
factory insta lled rims . If different rims are fit-
ted, the correct wheel bolts with the right
length and correctly shaped bolt heads must
be used. This ensures that wheels are fitted
securely and that the brake system functions
correctly .
In certain circumstances, you may not use
wheel bolts from a different vehicle - even if it
is the same model r=> p age 270.
A
WARNING
Improperly tightened or maintained wheel
bolts can become loose caus ing loss of
cont ro l, a collision and serious persona l in-
Jury.
- Always keep the wheel bolts and the
threads in the wheel hubs clea n so the
wheel bolts can turn easily and be prop-
er ly t igh t ened .
- Never grease or oil the wheel bo lt s and
the threads in the wheel hubs. They can
become loose while d riving if greased or
oiled, even if tightened to the specified
torque.
- Only use wheel bolts that belong to the
rim being installed.
- Never use different whee ls bolts on your
vehicle.
- Always maintain the correct tighten ing
torq ue fo r t he wheel bo lts to reduce the
risk of a wheel loss . If the tightening tor-
que of the wheel bo lts is too low, they
can loosen and come out w hen the veh i-
cle is moving. If the tighteni ng torque is
too high, t he whee l bolts and threads
can be damaged and the whee l can be-
come loose.
@
Note
The specified torque for the whee l bolts is
90 ft lb (120 Nm) with a tolerance of± 7,4
ft lb(± 10 Nm) . Torque whee l bolts diago-
nally. After changing a whee l, the torque
must be checked as soon as possible with a
torque w rench - preferably by an author-
ized Audi dealer or qualified workshop .
Low aspect ratio tires
Your Audi is factory-eq uipped w it h low aspect
ra t io tires. These tires have been tho roughly
tested and been se lected specifically fo r your
model for their superb perfo rmance, road fee l
and handling under a variety of d riving condi -
t ions . Ask your author ized Audi dealer for
more details.
The low aspect ratio of these tires is ind icated
by a numera l of
55 or less
in the tire's size
designation. The numera l represents the ratio
of the tire's sidewa ll height in relation to its
tread width expressed in percentage. Conven-
t iona l tires have a he ight/w idth ratio of 60 or
more .
The performance of low-aspect- ratio tires is
particularly sensiti ve to improper inflation
pressure. It is therefore important that low
aspect ratio tires are inflat ed to the specified
pressure and that the inflation pressure is
regularly checked and maintain ed. Tire pres·
sures should be checked at least once a
month and always before a long trip
r=> page 231, Checking tire pressure .
What you can do to avoid tire and rim
damage
Low aspect rat io tires can be da mage d more
easily by impact w ith potholes, curbs, gull ies
or ridges on t he road, particularly if the tire is
u nd eri nflated.
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