IIIJIL_ T~ir~e=s~ a~n~d~ w~ h~ e~e~l~s'.,_ ______________________________________________ _
Wheel bolts
Wheel bolts must always be tightened to the correct
torque .
The design of wheel bo lts is matched to the factory installed rims . If
different rims are fitted, the correct wheel bolts with the right length
and correctly shaped bolt heads must be used. This ensures that
whee ls 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~ page 318.
& WARNING
Improperl y t ightened or maintained wheel bolt s can become loose
causing loss of control , a collision and seriou s personal injury.
• Alwa ys keep the wheel bolt s and the th reads in the w heel hubs
clean so the wheel bolts can turn easily and be properly tightened.
• Never grease or oil the wheel bolt s and the thre ads in the wheel
hubs. They can become loose while drivin g if greased or oiled,
even if tig hten ed to th e specified torque .
• Only use wheel bolt s th at belong to the rim being inst alled.
• Never use differ ent wheel s bolt s on your vehicle.
• Alw ays maintai n the correct t ightenin g torque for the w heel
bolts to reduce the risk of a whe el loss. If the tighten ing torque of
t he w heel bolt s is too low, they can loosen and com e out w hen th e
vehicle is mov ing. If th e tighte ning torque is too high, the whe el
bolts and th reads can be damaged and the w heel can become
loose.
0 Note
The specified torque for the wheel bolts is 90 ft lb (120 Nm) with a
tolerance of ± 7,4 ft lb(± 10 Nm). Torque whee l bolts diagonally.
After changing a wheel, the torque must be checked as soon as
possible with a torque wrench - preferably by an authorized Audi
dea ler or qua lified workshop . •
Low aspect ratio tires
Your Audi is fac t ory-equipped with low aspect ratio tires. These tires
have been thorough ly tested and been selected specifically for your
model for their superb performance, road feel and hand ling under
a variety of driving conditions . Ask your authorized Audi dealer for
more details.
The low aspect ratio of these t ires 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 relat ion to its tread w idth expressed
in percentage. Conventiona l tires have a height/width ratio of 60 or
more .
The perform ance of low-as pect -ratio t ires is part icularly sensitive to
improp er inflat ion pressure. It is there fore important that low
aspect rat io tir es are inflated to the specified pressure and th at th e
inflation pressure is regularl y checked and maintained . Tire pres-
sures should be checked at least once a month and alw ays before a
long trip ~ page 274, "Checking tire pressure".
What y ou ca n d o to av o id ti re a nd rim dama ge
Low aspect ratio tires can be damaged more easi ly by impact with
potho les, curbs, gull ies or ridges on the road, particularly if the tire
is underinflated.
In order to minimize the occurrence of impact damage to the ti res
of your vehic le, we recommend that you observe the fo llowing
precautions:
• Always maintain recommended inflation pressures . Check your
tire pressure every 2,000 miles (3,000 km) and add air if necessary .
• Drive careful ly on roads with potholes, deep gullies or ridges.
The impact from driving through or over such obstacles can
damage your tires. Impact with a curb may also cause damage to
your tires . .,_
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