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chains beca use 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 .
@
Tips
Where snow cha ins are mandatory oncer-
tain roads, this normally also applies to
veh icles with all -wheel dr ive.
Wheel bolts
Wheel bolts mu st always be tigh tened 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 t he right
length and correctly shaped bolt heads must
be used . This ensures that wheels are f itted
secure ly and that the brake system functions
correctly .
In certain circumstances, you may not use
wheel bolts from a d iffe rent vehicle - even if it
is the same mode l ¢ page 285 .
A
WARNING
Imprope rly tig hte ned or maintained whee l
bolts can be come loose caus ing loss of
contro l, a collision and serious persona l in-
jury .
- Always keep t he wheel bolts and t he
th reads in the wheel hubs clea n so the
wheel bolts can turn easily and be prop-
er ly tightened .
- Never grease or oil the wheel bo lt s 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 tightening
torq ue for the wheel bo lts to reduce the
Tire s an d wheel s
257
risk of a wheel loss. If the tighte ning tor-
que of t he 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 h igh, the wheel bolt s and threads
can be damaged and the whee l can be-
come loose.
(I)
Note
The specified torque for the whee l bolts is
90 ft lb (120 Nm) with a tole ranc e of± 7,4
ft lb(± 10 Nm). Torque whee l bolts diago-
nally. Afte r cha nging a whee l, the torq ue
must be checked as soon as possible wit h a
torque wrench - prefe rably by an aut hor-
ized Audi dealer or qualif ied workshop .
Low aspect ratio tires
Your Audi is facto ry-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 handling under a variety of driving cond i-
tions . Ask your authorized Audi dealer for
more details.
The low aspect ratio of these t ires is ind icated
by a numeral of
55 or less
in the tire's size
designation . The numera l rep resents t he ratio
of the t ire's sidewall height in relation to its
t read width expressed in perce ntage. Conven -
tion al ti res have a he igh t /w idth ratio of 60 or
more.
The performance of low-aspect-ratio tire s is
particularly sensitiv e to improper infla t ion
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 246, Checking tire pressure .
What you can do to avoid tire and rim
damage
Low aspect ratio tires can be damaged more
easily by impact wit h potholes , curbs, gul lies
..,.
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