wheel size AUDI S8 2010 User Guide

Tires and wheels -_______________________________ f!:f'II
[I) Tips
Where snow cha ins a re mandatory on certain roads, this no rmally
also applies to vehicles with All W heel Dr ive .•
Wheel bolts
Wheel b olts must al ways be tig hten ed to the correct
torque.
Th e design of whee l bo lts is matc hed to the facto ry installed rims. If
different r ims are fitted, the correct wheel bolts wi th t he r igh t lengt h
and correctly s haped bolt heads must be used . Thi s ensures that
w heels are fi tted secure ly and tha t the br ake system f unc tion s
correctly.
I n cert ain circumst ances, yo u may not us e wheel bolts from a
different veh icle -even if it is the same model=>
page 363.
& WARNING
Improperly tightened or maintained wheel bolts can become
loose causing lo ss of control, a collision and serious per sonal
injury .
• Always keep the wheel bolts and the thread s in the wheel hub s
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 d riving 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 loo sen and come out when the
vehicle is moving. If the tightening torque is too high, th e wheel
Safety first
& WARNING (co ntinued )
bolts and threads can be damaged and the wheel can become
loose .
0 Note
The speci fied tor que f or th e wheel bolts is 90 ft lb (1 2 0 Nm) wi th a
tolerance of ± 7,4 ft lb( ± 10 Nm). Torque wheel bolts diagonally.
After ch anging a wheel, the to rque mu st be checked a s so on as
poss ible with a torque w rench -prefe rab ly by an authorized Aud i
dealer or qualified workshop. •
Low aspect ratio tires
Your Audi is fa cto ry -equ ip ped wi th low aspec t ratio tires. These tire s
have been thorough ly tested and been selected specifically for your
mode l for the ir supe rb perfo rmance, roa d fee l an d han dling un der a
var iety of driv ing cond it ions. Ask your author ized Audi dea ler for
more deta ils.
Th e low a spect rat io of these tires is indica ted by a nu meral of
55 or
less
in the tire's size designation. The numeral represents the ratio of
t he t ire's s idewall heigh t in relat io n t o its t re ad wi dth expressed in
percentage. Conventiona l tires have a height/width ratio of 60 or
more .
The performance of low -aspect -ratio tires is particularly sen sitive 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 mainta ined. Tire pres­
s ure s should be checked at lea st once a month and always before a
long trip =>
page 313, "Checking tire pressure".
What you can do to avoid tire and rim damage
Low aspect ratio ti res can be damaged more easi ly by impact w ith
potholes, curbs, gull ies or ridges on the road, p articular ly if the tire is
underinflated. .,_
Vehicle care Technical data