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260
T i re s and w heel s
chains because the vehicle will be ex-
tremely low. If you do drive with snow
chains on while the vehicle is at this lev-
el, the snow chains might severe ly dam-
age the wheelhouse and other parts of
the veh icle.
(D}
Tips
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 installed 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
secure ly 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 mode l ¢ page 287.
_&
WARNING
Imprope rly tig htened o r maintained whee l
bolts can be come loose causing loss of
contro l, a collision and serious persona l in-
jury.
- Always keep the wheel bolt s an d the
threads in the wheel hubs clea n so the
wheel bolts can tu rn easily and be prop-
er ly tightened .
- Never grease or oil the wheel bo lts and
the threads in the wheel hubs. They can
become loose while driving if greased or
oiled, even if tightened to the specif ied
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 for the wheel bo lts to reduce the
risk of a whee l loss. If the tightening tor-
que of the wheel bolts is too low, they
can loosen and come out when the vehi-
cle is mov ing. If the tighte ning torque is
too high, the wheel bolts a nd 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. Afte r changing a whee l, the torque
must be checked as soon as possible wit h a
torque wrench - pre ferably by an au t hor-
ized Audi dealer or qualified workshop .
Low aspect ratio tires
Your Audi is factory-eq uipped with low aspect
ratio tires. These tires have been thoro ughly
tested and been se lected specifically for your
model for their superb performance, road fee l
and hand ling under a var iety 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 numeral of
55 or less
in the tire's s ize
designation . The numeral rep resents the ratio
of the t ire's sidewa ll height in relation to its
t read width expressed in percentage. Conven-
t iona l t ires have a he igh t /w idth rat io of 60 or
more.
The performanc e of low-aspect-ratio tires is
particularly sensitive to improper inflation
pressure. It is therefore important that low
aspect ratio tires are inflated to the specified
pressure and that the inflation pressure is
regularly checked and maintained. Tire pres-
sures should be checked at least once a
month and always before a long trip
¢
page 249, Checking tire pressure .
What you can do to avoid tire and rim
damage
Low aspect ratio tires can be damaged more
easily by impact with potholes, curbs, gull ies
.,..
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