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Tires and wheels
111
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•
Wheel
bolts
Wheel bolts mus t al wa ys be tightened to the co rrect
tor que.
The design of wheel bo lts is matched to the factory installed rims. If
di ff erent r im s are fi tted, t he co rrect w he el bo lts wi t h the r ig ht len gth
and correct ly shaped bolt heads m ust be used. This ensures that
w he els are fitt ed secu rely and th at t he brake syste m f u ncti on s
correctly.
In certa i n ci rc ums t ances, y o u may no t use wheel bo lts fr om a
differ ent vehicle - even if it is the sa m e model=:> page
382.
&
WARNING
Improperly tightened or maintained wheel bolts can become loose
causing loss of control, a collision and serious personal injury.
•
Always keep the wheel bolts and the threads in the wheel hubs
clean so the wheel bolts can turn easily and be properly tightened .
•
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 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
bolts to reduce the risk of a wheel loss.
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 torque for the wheel bo lts is 90
ft
lb (120 N m) with a
t olerance of ± 7,4 f t lb(± 10 Nm). Tor que whee l b olts d iago nally.
After changing a whee l, the torque must be checked as soon as
possible with a torque wrench - preferably by an authorized Audi
dea ler or q ualif ied wo rksho p. •
Low aspect
ratio tires
You r Aud i is fact ory- eq uip pe d w it h low aspect rati o ti res. The se tir es
hav e been thorough ly t ested and been select ed specifical ly for your
mod el for thei r s upe rb pe rf or m anc e, ro ad f eel an d ha nd ling un der
a variety of driving conditions. As k your authorized Audi dealer for
m or e de t ails.
The low aspect rat io of t hese t ires is in d icat ed by a n ume ral of 55 or
less in the tire's size designatio n. The numeral represents the ratio
of t he t ir e's sid ewa ll he ig ht in relati on t o it s tread w idt h ex pressed
in percentage . Conventiona l tires have a height/width
ratio of 60 or
more.
The performan ce 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 alway s before a
long trip :::::, page
331,
"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 with
pot ho les, cu rb s, g ull ies o r rid ge s on t h e road, part icular ly if th e t i re
is underinf lated .
In or de r t o mini m ize th e oc cu rren ce of im pact da m ag e to the tir es
of your vehicle, we recommend that you observe the fol lowing
pr ecaut ions :
•
A lwa y s m aint ain recom m ended infl at ion pressu res. Che ck y ou r
t ire p ressu re eve ry 2,000 mi les (3,000 km ) and add ai r if neces sary.
•
Driv e carefully on roads with potho les, deep gullies or ridges .
The impac t from d r iving t hrough or ove r such obstacles can
da m age y ou r t ir es. Imp act with a curb m ay also caus e damage to
your tire s.
.,_
Vehicle care
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