264 T ire s and w heel s
Wheel bolts
Wheel bolts must always be tightened to the
correct torque .
The design of wheel bolts is matched to t he
factory installed rims. If differen t rims are fit-
ted, t he correct wh eel bol t s with the right
len gth and correctly shaped bolt heads must
be used. This ensures that wheels are fitted
secure ly and t hat the brake system funct ions
correctly .
In certain circumstances, you may not use
wheel bolts from a diffe rent vehicle - even if it
is the same mode l
~ page 290.
_& WARNING
Imprope rly tig htened o r maintained whee l
bolts can become loose causing loss of
contro l, a collision and serious persona l in-
jury.
- Always keep the wheel bolts an d the
threads in the wheel hubs clean so the
wheel bolts can turn easily and be prop-
erly t ightened.
- 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 wheels bolts on your
vehicle .
-Always maintain the correct tighten ing
torque fo r the 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 com e out when the veh i-
cle is moving. If the t ightening torque is
too high, t he whee l bolts and threads
can be damaged and the wheel can be-
come loose.
@ Note
The spe cified tor qu e fo r the wheel bo lts is
90 ft lbs. (120 Nm) wit h a toler ance of
± 7,4 ft lbs. (± 10 Nm). Torque wheel bo lts
diagonally. Afte r changing a wheel, the
torque m ust be checked as soon as possi-
ble with a to rque wrenc h - preferab ly by an
a uthori zed Audi dea ler or q ua lified work-
shop .
Low aspect ratio tires
Your Audi is factory -equ ipped with low aspect
rat io tires . These tires have been tho roughly
tested and been se lected specifically fo r your
model fo r their superb perfo rmance, road fee l
and hand ling under a variety of driv ing condi -
t ions . Ask your authorized 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 numeral rep resents the ratio
of the tire's sidewa ll height in relation to its
tread width exp ressed in percentage . Conven-
tiona l tires have a he ight/w idth ratio of 60 or
more .
The performance of low-aspect-ratio tires is
particularly sensitive to improper inflation
pressure. It is therefore import ant 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 2 53, Checking tire pressure.
What you can do to avoid tire and rim
damage
Low aspect ratio tires can be damaged mo re
easily by impact wit h pot holes, curbs, g ullies
or ridges on the road, pa rt icularly if the t ire is
underinfla t ed.
In orde r to minimize the occurren ce of impact
damage to t he tires of your vehi cle, we recom-
men d t ha t you observe t he follow ing preca u-
tions:
- Always ma inta in recomme nded inflation
pressu res. Check you r tire pressure eve ry
2 ,000 miles (3,000 km) and add air if neces -
sary. ..,.
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