wheel size AUDI TT ROADSTER 2016 Owners Manual

Downloaded from www.Manualslib.com manuals search engine Airbag
system
In conjunction with the seat belts, the front air­
bags give additional head and chest protection
for the driver and passenger in the event of a se­
vere frontal collision <=> A in Important safety
notes on the front airbag system on page 238.
How the front airbags work
When fully inflated, the airbags reduce the risk
of head or chest injury.
Fig. 203 Front airbags in inflated condition
The driver's and passenger's airbag are triggered
in certain frontal collisions c:> Fig. 203. Further
airbag systems may also be triggered, depending
on the circumstances.
When the system is triggered, the airbags fill
with a propellant gas and open out in front of the
driver and passenger<=> Fig. 203. In order to pro­
vide the desired extra protection in an accident,
the airbags have to inflate extremely rapidly
(within fractions of a second). The fully deployed
airbags cushion the forwards movement of the
front occupants and help to reduce the risk of in­
jury to the head and the upper part of the body.
Special openings in the airbag allow the gas to
escape at a controlled rate to restrain the for­
ward movement of the occupant's head and tor­
so. Once the impact has been absorbed, the air­
bag deflates sufficiently for the front occupants
to see forward.
238 Important
safety notes on the front airbag
system
There are a number of safety points concerning
the airbag system which you should remember.
This will help to reduce the risk of injury in an ac­
cident.
Fig. 204 Minimum distance from steering wheel
A WARNING 0
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- It is important for the driver and passenger
to maintain a distance of at least 25 cm
from the steering wheel or dashboard
<=> Fig. 204. The airbag system will not be
able to give the required protection if you sit
too close to the steering wheel or dash­
board. There is also a risk of injury if the air­
bags are inflated. Additionally, the seat po­
sition should always be adjusted to the body
size of the occupant.
- If you do not wear a seat belt, if you lean
forward or to the side, or are not seated cor­
rectly while the vehicle is in motion, you are
at greater risk of injury. Should the airbag
system be triggered in an accident there is
an even greater risk of injury.
- Never let a child travel on the passenger
seat without an appropriate restraint sys­
tem. If the airbag is triggered in an acci­
dent, the child could sustain serious or fatal
injuries c:> page 223, Child seats.
- Child seats in which the child faces the rear
of the car are located directly in the path of
the passenger's airbag if it inflates. In this
case, the child could sustain serious or fatal
injuries if the airbag were to be deployed.
- Applies to vehicles on which the passeng-
er's airbag cannot be deactivated: Do NOT
�

Downloaded from www.Manualslib.com manuals search engine Wheels
Wheels
Tyres and rims
General notes
� Inspect the tyres regularly for damage (cuts,
cracks or blisters, etc.). Remove any foreign
bodies embedded in the treads.
� If you have to drive over a kerb or similar obsta­
cle, drive very slowly and as near as possible at
a right angle to the kerb.
� Damaged rims or tyres must be replaced imme­
diately.
� Keep grease, oil and fuel off the tyres.
� Mark
the wheels before taking them off so that
they rotate in the same direction when refitted.
� When removed, the wheels should be stored
flat in a cool, dry and preferably dark place.
CD CAUTION
- Please note that summer and winter tyres
are optimised for the prevailing road condi­
tions at different times of year. We recom­
mend that you use winter tyres during the
winter months. At low temperatures, sum­
mer tyres lose their elasticity and grip, and
braking performance also suffers as a re­
sult. Cracks can form in the tread block on
summer tyres if they are used at very cold
temperatures, and this can cause perma­
nent damage to the tyres. An increase in
rolling noise and tyre imbalance may result
from this damage.
- Machined, polished or chrome-plated rims
must not be used in winter conditions. The
process used to manufacture these types of
wheel rim does not provide adequate sur­
face protection against corrosion, and the
rims can be permanently damaged by road
salt or similar.
New wheels or tyres
It is best to have all servicing of wheels and tyres
performed by a qualified workshop, since they
l l
COC = Certificate of conformity
254 have
the necessary special tools and replacement
parts in addition to trained personnel.
� New tyres do not yet give maximum grip. When
driving with new tyres, drive at moderate
speeds and be especially careful during the first
500 km.
� All four wheels must be fitted with tyres of the
same type, size (rolling circumference) and
preferably the same tread pattern.
� Tyres should be replaced in pairs and not indi­
vidually (i.e. both front tyres or both rear tyres
together).
� We recommend the use of Audi Genuine Tyres.
If you wish to use other tyres, please note that
the actual size can differ from the nominal size
marked on the tyre ¢ A .
� If you wish to purchase a different combination
of rims and tyres than the ones fitted on the ve­
hicle during production, it is advisable to con­
sult a qualified workshop beforehand ¢ A.
The sizes of the rims and tyres approved for your
vehicle are listed in the vehicle's documents (e.g.
EC Certificate of Conformity or COC document l)).
The vehicle documents vary depending on the
country in which the vehicle is registered.
If the spare wheel* is not the same type as the
tyres fitted on the car (for example if the car has
winter tyres or wide-section tyres) you should on­
ly use the spare wheel* if a puncture occurs, and
then only for a short period of time. In this case,
please drive with extra care. Refit a normal road
wheel as soon as possible.
On vehicles with four-wheel drive, all four wheels
must always be fitted with tyres of the same
type, make and tread pattern, as the driveline
could otherwise be damaged by variations in the
wheel speeds. For the same reason, only use a
spare wheel* which has the same rolling circum­
ference as the normal road wheels.
Manufacturing date
The manufacturing date is indicated on the tyre
sidewall (possibly only on the inner side of the
wheel): ..,.

Downloaded from www.Manualslib.com manuals search engine 0
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CX) DOT
... 2216 ...
means, for example, that the tyre was produced
in the 22nd week of 2016.
Audi Genuine Tyres
Audi Genuine Tyres with the marking "AO" are
specially matched to your Audi. When used prop­
erly, these tyres meet the highest standards in
safety and handling. Your specialist retailer will
be glad to provide more information.
_& WARNING
- Use only tyre/rim combinations and match­
ing wheel bolts approved by Audi. Otherwise
damage to the vehicle and an accident could
result.
- For technical reasons, it is not possible to
use wheels from other vehicles. In certain
cases, it is not even possible to use wheels
from another vehicle of the same model.
- It is very important to ensure that the tyres
you have chosen have adequate clearance.
When selecting replacement tyres, do not
rely entirely on the nominal tyre size
marked on the tyre; with some makes of
tyre the effective tyre size can differ signifi­
cantly from the nominal dimensions, even
though the tyres have the same size desig­
nation. Inadequate tyre clearance can result
in damage to the tyres or the vehicle, caus­
ing a serious safety risk.
-Avoid running the car on tyres that are more
than 6 years old. If you have no alternative,
you should drive slowly and with extra care
at all times.
- The use of run-flat tyres on your vehicle is
NOT authorised! Unauthorised use can cause
an accident or damage your vehicle.
- If wheel trims are fitted after the car is pur­
chased, ensure that there is an adequate
flow of air for cooling the brakes -risk of ac­
cident!
1} Please observe the applicable regulations in the country in
which you are travelling. Wheels
Tyre wear / damage
Fig. 221 Tyre tread: Tread wear indicators
Tyre wear
Inspect the tyres regularly for damage.
- The wear on under or over-inflated tyres is sig­
nificantly higher.
- Fast cornering, heavy acceleration and hard
braking all increase tyre wear.
- If you notice excessive tyre wear, have the
wheel alignment checked by a qualified work­
shop.
- Have your tyres rebalanced if steering wheel vi­
brations indicate an imbalance. Otherwise, the
tyres and other parts of the vehicle may wear
faster.
Tread wear indicators
The original tyres on your vehicle have 1.6 mm
high tread wear indicators
¢ Fig.
221 running
across the tread at regular intervals. The letters
"TWI" or triangles on the sidewall indicate the
positions of the tread wear indicators.
The minimum tread depth 1
) is reached at the lat­
est when the tread is worn down to the tread
wear indicators. Replace the tyres with new ones
¢ _8..
Changing wheels round
Wheels should be changed round regularly to en­
sure that the wear is equal on all tyres. Fit the
wheels from the rear axle on the front axle and
vice-versa. All the tyres will then last for about
the same time.
255

Downloaded from www.Manualslib.com manuals search engine Wheels
On tyres with a directional tread pattern, note
the direction of rotation indicated on the sidewall
¢page 275.
Concealed damage
Damage to tyres and rims is often not readily visi­
ble. If you notice unusual vibrations or the car
pulling to one side, this may indicate that one of
the tyres is damaged. Reduce your speed imme­
diately. Inspect the tyres for damage. If no exter­
nal damage is visible, drive slowly and carefully
to the nearest qualified workshop and have the
car inspected.
A WARNING
Insufficient tread depth or different tread
depths on different wheels reduce safety. This
is particularly evident in vehicle handling,
when there is a risk of aquaplaning in deep
puddles of water and when driving through
corners. Braking is also adversely affected -
risk of accident!
Tyre pressure
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Fig. 222 End face of driver's door: Sticker listing the tyre
pressures "'
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The correct inflation pressures for tyres fitted at
the factory and for the compact temporary spare
wheel* are specified on a sticker. The sticker
¢Fig. 222 is on the end face of the driver's door.
@ Tyre size
@ Tyre pressure for the front wheels
© Tyre pressure for the rear wheels
(!) Tyre pressure if vehicle is partially loaded
@ Tyre pressure if vehicle is fully loaded
256 @
Tyre pressure for the compact temporary
spare wheel*
If you intend to drive the vehicle with a partial
load, adjust the tyre pressures to the specified
setting (D. Should you wish to drive with a full
load, you must increase the tyre pressure to the
specified maximum@ ¢&_.
Checking / adjusting the tyre pressures
"' Check the tyre pressures at least once a month
and, in addition, before starting a long journey.
.. The tyre pressures should only be checked
when the tyres are cold. The slightly raised
pressures of warm tyres must not be reduced.
.. Refer to the sticker ¢ Fig. 222 for the correct
tyre pressures according to the load the vehicle
is carrying.
.. If necessary, adjust the tyre pressure.
.. Vehicles with tyre pressure loss indicator* or
tyre pressure monitoring system*: Store the
new tyre pressures in the infotainment system
¢page 259.
"' Check the pressure of the spare wheel* /com­
pact temporary spare wheel*. Keep the spare
tyre inflated to the highest pressure approved
for the tyre.
A WARNING
Always adjust the tyre pressures to match
your driving style and the load the vehicle is
carrying.
- Excessive loads can cause you to lose control
of the vehicle -risk of accident!
- Under-inflated tyres flex more and can over­
heat at high speeds or when the vehicle is
carrying a heavy load. This could cause a
tyre blow-out and you could lose control of
the vehicle -risk of accident!
- Incorrect tyre pressures increase tyre wear
and adversely affect vehicle braking and
handling -risk of accident!
CD CAUTION
Replace any lost valve caps to prevent dam­
age to the tyre valves.

Downloaded from www.Manualslib.com manuals search engine Wheels
... Check that the snow chains are correctly seated
after driving for a few yards; follow the instruc­
tions given by the manufacturer.
... Keep your speed below 50 km/h. Please ob-
serve the applicable local regulations.
For technical reasons snow chains may only be
used on tyres with certain wheel rim/tyre combi­
nations.
Rim size Rim offset Tyre size
7Jx17 47 mm 225/50
8Jx19 52
mm
225/40
You must remove the snow chains on roads which
are free of snow; otherwise the vehicle handling
may be impaired and the tyres may be damaged.
A WARNING
Unsuitable or incorrectly mounted snow
chains can cause you to lose control of the ve­
hicle -risk of accident!
CD CAUTION
- Snow chains can damage the rim/hubcap* if
they make direct contact with it. Remove
the hubcaps* beforehand. Use snow chains
which have a protective coating.
- If you use snow chains with links that pro­
trude more than 13.5 mm, this could cause
severe damage to the wheel housings and
other parts of the vehicle.
({D Note
When driving with snow chains, it may help to
switch on sport mode ¢ page 114.
Low-profile tyres
Applies to: vehicles with low-profile tyres
Your vehicle is fitted with low-profile tyres* as
standard equipment. Low-profile tyres have a
lower sidewall and provide a wider tread surface
and rim diameter than other wheel/tyre combi­
nations. This makes the car's handling more
agile. However, the ride may be less comfortable
on poor-quality roads and tracks, and rolling
noise may be louder.
258 Low-profile
tyres can be damaged more quickly
than standard tyres, for example by heavy jolts,
potholes, manhole covers, speed humps and
kerbs. It is therefore particularly important to
ensure that they are inflated to the correct pres­
sure c:>page 256.
Drive with particular care on poor-quality roads
to ensure that you do not damage the rims and
tyres.
Make sure to check your wheels regularly (every
3,000 km) for damage such as blisters/tears on
the tyre sidewalls or deformations/cracks on the
rims.
After a heavy jolt, or if any damage occurs, you
should have the rims and tyres checked and if
necessary replaced by a qualified workshop.
Tyre wear occurs more quickly on low-profile
tyres than on standard tyres.
Summer tyres are not suitable for cold condi­
tions, snow or ice. Use winter or all-season tyres
when driving in these conditions c:::> page 257.
Tyre pressure Loss
indicator
Tyre pressure loss indicator in instrument
cluster
Applies to: vehicles with tyre pressure loss indicator
The tyre pressure Loss indicator in the instrument
cluster informs the driver if the tyre pressure is
too Low or a system malfunction has occurred.
The tyre pressure loss indicator makes use of the
ABS sensors to compare the rolling circumfer­
ence and the vibration of the tyres. If changes in
the inflation pressure are detected on one or
more tyres, the driver is alerted by an indicator
lamp [tE and a message on the infotainment dis­
play. If only one tyre is affected, the display will
indicate its position.
Each time you change a tyre, change the wheels
round or change the tyre pressures on your vehi­
cle (e.g. when switching from partial load to full
load and vice-versa), you must store the new tyre
pressures on the infotainment system
c:::> page 259. Monitoring of the tyre pressures is
�