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T _ir _ e _s _ a _n _ d _ w _ h_ e _e _ ls _______________________________________________
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Wheel
bolts
Wheel bolts must always be tightened to the correct
torque .
The design of wheel bolts is matched to the factory installed rims. If
different rims a re fitted, t he cor rect wheel bolts with the rig ht leng t h
and correctly shaped bolt heads must be used. This ensures that
w heels are fitted secure ly and th at t he brake system func ti on s
correctly .
In certain circ umstances, you may not use whee l bolts from a
different veh icle - even if it is the same mode l ~ page 278.
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WARNING
Improperly tightened or maintained wheel bolts can become
loose causing loss of control , a collision and seriou s personal
injury.
• Always keep the wheel bolts and t he thread s in the wheel hubs
clean so the wheel bolts can turn easily and be properly t ighten ed.
•
Never grease or oil the wheel bolt s and the threads in the wheel
hubs. They can become loose while driving if greased or oiled, even
if tightened to the specified torque.
• Only use wheel bolts that belong to the rim being installed.
• Never use different wheels bolts on your vehicle .
• Always maintain the correct tightening torque for the wheel
bolt s to reduce the risk of a whee l los s. If the tightening torque of
the wheel bolts is too low , they can loosen and come out when the
vehicle is moving . If the tightening torque is too high, the wheel
bolts and threads can be damaged and the wheel can become
loose .
0
Note
The specified torq ue for t he whee l bolts is 90 ft lb (12 0 Nm) with a
tolerance of ± 7,4 ft lb( ± 10 Nm). Torque whee l bolts diagona lly.
After changing a wheel, the torq ue m ust be checked as soo n as
possible wit h a t orqu e w rench - prefer a bly by an au t ho rized Audi
dealer or qualified workshop. •
Low aspect
ratio tires
Your Audi is factory-eq uipped with low aspect ratio tires. These tires
have bee n t horou gh ly t este d and been se lect ed spe cifically fo r yo ur
model for their superb performance, road feel and hand ling under a
var iety of dr iving con ditions . Ask your authorized Audi d ea le r for
more deta ils .
The low aspect ratio of these t ires is ind icated by a numera l of 55 or
less in t he tire 's size designation . The numera l rep resents t he ratio of
the tire's sidewall he ight in relat ion to its tread width exp ressed in
pe rcen t age . Co nven ti onal ti res have a heig ht/w idth ratio 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 press ure is regularly checked and maintained. Tire pres-
sures should be checked at least once a month and always before a
long trip ~
page 226, "Che cking t ire press ure".
What
you can do to avoid
tire
and rim damage
Low aspe ct ratio tires ca n be damaged more eas ily by imp act with
potholes, curbs, gul lies or ridges on the road, part icu larly if the tire is
unde rinfl ated.
In order to minimize the occu rrence of impact damage to the tires of
your vehicle, we recommend that you observe the follow ing precau -
tions:
• Always ma inta in recommen d ed inflation pressures. Check your
t ire press ure every 2,000 m iles (3,00 0 km) a nd add air if ne cess ar y.
•
Drive ca ref ully on roads with potho les, dee p gullies or ridges. The
im pact from d riving t hrough or over such obsta cles can damage you r
tires. Impact w it h a curb may also cause damage to your tires .
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