@ Tips
- Where snow chains are mandatory on
certain roads, this normally also applies
to vehicles with All Wheel Drive.
- If snow chains are insta lled, the tire
pressures shou ld not be stored in the tire
pressure monitoring system (TPMS).
Otherwise the system could malfunction
¢ page 232.
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 wit h the right
length and correctly shaped bolt heads must
be used. This ensures that wheels are fitted
secure ly and that the bra ke system functions
correctly .
In certain circumstances, you may not use
wheel bolts from a differ ent vehicle - even if it
is the same mode l.
.&, WARNING
Imprope rly tig hte ned or maint ained wheel
bolts can become loose causing loss of
cont rol, a collision and ser ious persona l in-
jury.
- Always keep the wheel bolts and the
threads in the wheel hubs clean so the
whee l bolts can tu rn easily and be prop-
er ly t ightened.
- Never grease or oil the wheel bolts and
the threads in the wheel hubs. They can
become loose while driving if greased or
oiled, even if tightened to the specified
torq ue.
- Only use wheel bolts t hat belong to the
rim being installed.
- Never use different whee ls bolts on your
vehicle.
- Always maintai n the correct tighten ing
torq ue for the wheel bolts to reduce the
risk of a wheel loss. If the tightening tor-
Tire s an d wheel s 229
que of t he whee l bolts is too low, they
can loosen and come out when the vehi-
cle is moving. If the tig htening torq ue is
too high, the wheel bolts and threads
can be damaged and the whee l can be-
come loose.
(D 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 tor qu e
must be checked as soon as possible with a
torq ue wrench - prefe rably by an aut hor-
ized Audi dealer or qualified workshop .
Low aspect ratio tires
Your Audi is factory -equipped with low aspect
ratio tires . These tires have been tho roughly
tested and been se lected specifically for your
model for their superb performance, road fee l
and handli ng under a variety of driving condi-
tions . Ask your authorized Audi dealer for
more details.
The low aspect ratio of these t ires is indicated
by a numeral of
55 or less in the tire's size
designation . The numera l represen ts the ratio
of the t ire's sidewa ll height in relation to its
t read width expressed in percentage. Conven-
tiona l tires have a height/w idt h rat io of 60 or
more.
The performance 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 218, 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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