2015 AUDI TT ROADSTER tire type

24 Driver information system
the calculation of the current trip informa­
t ion. If the trip is interrupted for
more than 2
hours
the memory is reset automatica lly.
Total -trip memory (Trip computer 2)
Unlike the sing le-trip memory, the total-trip
memory is not reset automatically. This per­
mits you to evaluate your dr iving data for the
entire period between manual resets.
Efficiency program*
The effic ien cy program can help you to use
less fuel
~ page 2 7.
Operation
The trip computer is controlled by two
switches on the windshield wiper lever.
-----------< @
Fig. 10 W iper arm/w iper lever: con tro ls for t he trip
compute r
Selecting the trip computer
"Tap the I Reset I button @ until the trip com ­
puter (memory level 1 or 2) appears in the
display ¢
page 23, fig . 8.
Selecting the functions
" Push in the upper (lower) protrusion on the
function selector switch @
q fig. 10. The
functions for the trip computer are d is ­
played in succession on the respective mem­
ory levels.
Resetting the function to zero
" Push the I Reset I button @ for at least two
seconds.
You can reset the fo llowing values to zero us­
ing the
I Reset I button :
- driving time -
distance
- average f uel mileage
- average speed
The t rip computer only operates when the ig­
nition is on. When you turn on the ignition,
the function that was in use when you last
turned the ignition off will be displayed .
(D Tips
-You can also set the values for the func­
tions to zero in the menu display
(Reset )
qpage24 .
-All stored values will be lost if the vehi­
cle battery is disconnected .
- The driving information in the efficiency
program is a lso reset to zero with the
single-trip memory.
Menu display
Introduction
Display Type
•set
iF'Cf t -,,., ==
Menu off
Fig. 11 D isplay: Sta rt men u
Some funct ions in yo ur vehicle can be set , ac­
t ivated, and controlled by
Menus (e.g. Acous­
tic park assist *). With these menus you can al­
so select the information shown in the driver
information system, which operates only with
the ignition switched on. Operation is control­
led by the
! Reset I button and the rocker switch
on the wiper lever
q page 25, fig . 12.
The Start menu shows you the different dis­
play types
q fig . 11 . Each display type in the
Start menu contains a submenu with addi­
tional options .

180 Tire s and wheel s
Tires and wheels
Tires
General notes
Tires may be the least appreciated and most
abused parts of a motor vehicle .
Tires may be the least appreciated and most
abused parts of a motor vehicle . Tires are,
however, one of the most important parts of a
vehicle, particularly considering the compara­
tive ly small patch of rubber on each tire that
assures that a ll-impo rtant contact between
you, your vehicle and the road.
Maintaining the correct tire pressure, mak ing
sure that your vehicle and its tires do not have
to carry mo re weight than they can safe ly han­
d le, avoiding damage from road hazards and
reg ularly inspecting t ires for damage includ­
ing cuts, slashes irregu la r wear and ove rall
condition are the most important things that
you can do to he lp avoid sudden tire failure in­
cluding tread separation and blowouts.
Avoiding damage I f you have to drive over a curb or similar ob­
stacle, drive very s low ly and as close as possi ­
b le at a right angle to the curb.
A lways keep chem ica ls includ ing gre ase, o il,
gasoline and b rake fluid off the ti res .
Inspect the t ires regularly for damage (cuts,
cracks or b listers, etc.). Remove any fo reign
bod ies embedded in the treads.
Storing tires Mark tires when you remove them to indicate
the direction of rotation . Th is ensures you to
be ab le to mount them correctly when you re­
install t hem.
When removed, the whee ls or t ires should be
stored in a cool, d ry and preferably dark place .
Store tires in a vertical pos ition if they are not
mounted on rims, in a horizontal pos it ion if
they are mounted on rims. New tire
s
New t ires have to be broken in¢&,. .
T he tread depth of new t ires may vary, accord­
ing to the type a nd make of t ire and the tread
pa tte rn .
Hidden damage
Damage to tires and r ims is ofte n not readily
vis ible . If you notice unusual v ibrat ion or the
vehicle p ulls to one side, th is may ind icate
t h at one of the t ires has been damaged . Th e
t ir es m ust be checked immed iate ly by an au ­
tho rized Aud i dea le r or q uali fied wor ks hop.
Unidirectional t ires
A un idirectional tire can be identified by ar­
rows on the sid ewa ll, that po int in the direc­
t ion the t ire is desig ned to rotate. You mus t
f ol low the specified d irection of rotation . This
is necessary so that these tires can develop
their optimum characterist ics regarding grip,
road no ise, wear and hyd rop laning resistance.
For more information
¢page 211.
A WARNING
-New tires or tires that are old, worn or
damaged cannot provide maximum con­
trol and braking ability .
-
-New tires tend to be slippery and must
be broken in . To reduce the risk of losing
control, a co llision and ser ious personal
in jur ies, d rive w ith special ca re fo r the
fi rst 350 m iles (560 km).
- Driving with worn or damaged tires can
le ad to loss of control, sudden tire fail­
ure, including a blowou t and sudden de­
fl ation, c rashes and seriou s personal in­
juries . Have wo rn or damaged t ires re­
p laced immediate ly .
- T ires age even if they are not being used
an d can fai l sudden ly, especially at high
speeds. Tires that are more than 6 years
old can only be used in an emergency
and then w ith specia l care and at low
speed.

-Never mount used tires on yo ur vehicle if
yo u are not sure of their "previous histo­
ry." Old used tires may have been dam­
aged even though the damage cannot be
seen that can lead to sudden tire failure
and loss of vehicle control.
- If you notice unusual vibration or if the
vehicle pulls to one side when d riving, al­
ways stop as soon as it is safe to do so
and check the wheels and tires for dam­
age .
(D Note
-Please note that summer and winter
tires are designed for the cond itions that
are typ ic al in those seasons. Aud i recom­
mends using w inter t ires du ring the win-
Glossary of tire and loading terminology
Accessory weight
means the comb ined weight (in excess of
those standard items which may be replaced)
of automatic tra nsmission, power steering,
power brakes, power windows, power seats,
radio, and heater, to the extent that these
items are availab le as factory-installed equip­
ment (whether installed or not) .
Aspect ratio
means the ratio of the height to the width of
the tire in percent . Numbers of 55 or lower in­
d icate a low sidewall for improved steering re­
sponse and better overall handling on dry
pavement .
Bead
means the pa rt of the ti re that is made of
steel wires, wrapped or reinforced by ply cords
and that is shaped to fit the rim.
Bead s eparation
means a b reakdown of the bond between
components in the bead.
Cord
means the strands forming the plies in the
tire.
Tire s an d wheel s 181
ter months . Low temperatu res signifi­
cantly decrease the elastic ity of summer
t ires, which affects traction and braking
ability. If summer tires are used in very
co ld temperatures, cracks can form on
the tread bars, res ulting in permanent
ti re damage that can cause loud drivi ng
noise and unbalanced tires. Aud i is not
responsib le for this type of damage.
- Burn ished, polished or chromed rims
must not be used in winter weather. Th e
surfa ce of the rims does not have suffi­
c ien t cor rosion pro te cti on for this and
c o ul d be pe rmanen tly damaged by road
salt or similar substances. This damage
is not covered by warranty.
Cold tir e inflation pressure
me ans the t ire press ure re commended by the
vehicle manufacturer fo r a tire o f a des igna ted
size that has not bee n driven for more than a
coup le of miles (k ilomete rs) at low speeds in
the three hour pe riod before the tire press ure
is measured or adjusted.
Curb weight
means the weight o f a motor vehicle with
standard equipment including the maximum
capacity of fuel, o il, and coolant, air cond i­
tion ing and additional weight of optiona l
equipment.
E xtra load tire
means a tire designed to operate at higher
l oads and at higher inflation press ures than
the corresponding standard tire. Extra load
tires my be ident ified as "XL", "xl", "EXTRA
LOAD", or "RF" on the sidewall.
Gross Axle Weight Rating ("GAWR")
means the load-carrying capacity of a single
axle system, measured at the tire-ground in-
ter~ces.
~
•
•

190 Tires and wheels
Tire service life
The service life of tires depends on a lot of
different things including proper installation
and balancing, correct tire pressure and driv­
ing style.
Fig. 138 Tire tread: tre ad wea r ind icators (TWI)
f ~----~
~ ..__ ____ __,
Fig. 139 Rotating t ires for more ev en wea r
Tread Wear Indicator (TWI)
The origina l tires on your veh icle have
1/16 inch (1.6 mm) high "wear indicators"
c::> fig . 138 running across the tread. Depend­
i ng on the make, there will be six to eight of
them evenly placed around the tire. Marks on
the tire sidewa ll (for example "TWI" or other
symbols) indicate the positions of the tread
wear ind icators . Worn tires must be replaced .
Different figures may apply in other countries
c::> & .
Tire pressure
Incorrect tire pressure causes premature wear
and can cause sudden t ire blow-out. For th is
reason, tire pressure must be checked at least
once a month
c::> page 186.
Driving style
Driving fast around curves, heavy acceleration
and hard braking increase tire wear.
Rotating tires for more even wear
For all four tires on your vehicle to have the
same service life, we recommend that the
front and rear tires are rotated according to
the tire manufacturer's suggested tire rota­
tion intervals. Please remember the follow­
ing :
- Tire rotation intervals may differ from the
vehicle service interva ls outlined in your
Warranty
& Maintenance Booklet.
- The longer one tire is used in one location
on the vehicle, the more it wears at certain
points; therefore, we recommend that you
follow the tire manufacturer's suggested
tire rotation intervals .
- Vehicles with front-wheel drive experience
more tread wear on the front wheels com­
pa red to all-wheel drive (quattro) .
- Please rotate tires as shown
c::> fig. 139.
-Extra care must be taken when rotating di-
rection-specific tires
c::> page 211 .
Wheel balancing
The wheels on new vehicles are balanced.
However, various situations during everyday
driving can cause them to become unbal­
anced, re sulting in vibrat ions you can usually
feel through the steer ing wheel.
Unbalanced wheels must be rebalanced to
avoid excessive wear on steering, suspension
and tires. A wheel must also be rebalanced
when a new tire is installed.
Incorrect wheel alignment
Incorrect wheel alignment can cause exces ­
sive tire wear, impairing the safety of the veh i­
cle. If tires show excessive wear, have the
whee l alignment checked by an authori zed
Audi dealer or qualified workshop.
all-wheel drive
Vehicles with quattro must always have tires
of the same size, construction and tread type .
For details see
c::> page 146 . ..,.

V up to 149 mph (240 km/h)l)
Z over 149 mph (240 km/h)
1
)
W up to 168 mph (270 km/h)ll
Y up to 186 mph (298 km/h)
1 )
Your veh icle is norma lly factory equipped with
t ires, which posses s excellen t driving charac­
ter istics and give your Audi opt imum driving
comfort . An electronic speed limiter
¢ page 30 w ill normally prevent your vehicle
from go ing faste r th an the tire speed rating
¢ &_ .
U.S. DOT T ire Identification Number (TIN )
and tire manufactur e date
This is the t ire's "serial numbe r" . It begins
with the le tters "DOT" and indicates that the
tire meets all federal standards . The next two
numbers or letters indicate the p lant where it
was manufactured, and the last four numbers represent the week and year of manufactu re.
Fo r example, the numbers 2213 mean that
t he t ire was produced in the 22nd week of
2013 . T he other numbers are marketing co ­
des that may or may not be used by the t ire
manufacturer . This information is used to con­
tact consume rs if a tire defect requires a re­
call.
Audi Original tire
Tires with the ident ificat ion "AO" or "RO" have
been spec ially matched with your Aud i. We
recommend using only these tires because
they meet the highest standards regard ing
safety and driving charac ter istics whe n used
correctly. Yo ur authorized Audi dealer will
g lad ly provide you with more informat ion.
Tire ply composition and materials used
The numbe r of p lies ind icates the numbe r of
l ayers of rubber -coa ted fabric in the t ire. In
general, the greater the number of p lies, the
mo re weight a tire can support . Tire manufac ­
turers also must indicate the materials in the
1) F o r tires wit h a m ax im um s pee d ca pabil ity over 149
mph (2 4 0 k m/h) , tire ma nufa cturers some times use
t h e le tters "Z R."
Tire s an d wheel s 193
tire, which include stee l, nylon, po lyester, and
others .
Maximum Load Rating
This number indicates the max imum load in
kil ograms and po unds that can be ca rr ied by
the tire.
Tire quality grading for treadwear ,
tract ion , and temperature resistance
T read wear, t raction and tempe ra tur e grades
¢page 194 .
Maximum Permissible Inflation Pressure
This number is the greatest amount of a ir
pressure that should ever be put in the tire
u nder norma l dr iv ing cond itions .
_&. WARNING
-Using incorrect o r unm atc hed tires and/
or wheels or improper tire and wheel
comb inat ions can lead to loss of control
,
collision and serio us personal inj ury .
- Always use t ires, rims and whee l bolts
that meet the specifications of original
factory- insta lled tires or other combina­
tions that have been specifically ap­ proved by the vehicle manufacturer.
- Tires age even if they are not being used
and can fai l sudden ly, especially at hig h
speeds. Tires that are more than 6 years
old can only be used in an emergency
and then w ith special care and at lower
speeds .
- Never mount used tires on your veh icle if
you are not sure of the ir "previous histo­
ry ." O ld used tires may have been dam­
a ged even thoug h the damage cannot be
seen tha t can lead to sudden tire fai lure
and loss of vehicle control.
.
- All fo ur whee ls must be fitted wit h ra dial
tires of the same type, size (rolling cir­
cumference) and the same tread pattern . ..,
•
•

194 Tire s and wheel s
Driving with different tires reduces vehi­
cle handling and can lead to a loss of
co ntrol.
- If the spare tire is not the same as the
t ires that are mounted on the veh icle -
for example with winter tires - on ly use
the spare tire for a short period of time
and dr ive with extra ca re. Refit the nor­
ma l road whee l as soon as safely possi­
ble.
- Never drive faste r than the maximum
speed for which the tires o n your veh icle
are ra ted because ti res th at are driven
faster than their rated speed can fail
sudden ly .
- Over loading t ires c ause heat b uild- up,
sudden tire failure, including a blowout
and sudden deflation and loss of control.
- T emperature grades app ly to tires t hat
are properly inflated and not over o r un­
derinflated.
- F or technical reasons it is not a lways
possible to use wheels from other
vehicles -in some cases not even w heels
from the same vehicle model.
- If you insta ll wheel trim discs on t he ve­
hicle whee ls, make sure that the air f low
to the brakes is not blocked. Reduced air­
flow to the brakes can them to overheat, increasing stopping distances and caus­
ing a collision.
- Run flat t ires may on ly be used on
vehicles that were equ ipped w it h them
at the facto ry. The vehicle must have a
chassis des igned for run f lat t ires and a
fac to ry-installed t ire p ress ure moni to r­
ing system that ind ic a tes a loss of tire
pressure. Incorrect use of run flat tires
can lead to vehicle damage or accidents .
Check with an a uth orized Audi dea ler or
t i re spec ialist to see i f your vehicle can be
equipped with run flat tires. If r un flat
t ires a re used, they must be installed on
all four wheels . M ixing tire types is not
permitted . (D Note
-For technical reasons, it is not generally
poss ible to use the w heel rims from oth­
er ve hicles. T his can hold tr ue for wheels
of the same vehicle type.
- If the spare tire is diffe rent from the
tires that you have mounted on your ve­
hicle (for example winter tires or wide
profi le tires), then use the spare tire for a
short period of time only and drive w ith
extra care. Replace the flat tire w it h the
ti re mat ching the othe rs on your vehicle
as soon as possi ble.
- N ever d rive without the valve stem cap.
T he v alves co ul d get damaged.
@ For the sake of the environment
Dis pose of o ld tires in accordance w ith the
l ocal requirements.
Uniform tire quality grading
- Tread wear
- Tra ction AA A B (
- Temperature ABC
Quality grades can be found where applicab le
o n the tire s ide wall between tread shoulder
and maximum section width
¢ page 191,
fig . 140 .
For example: Tread wear 200 , Traction AA,
Temperature A.
All passenger car ti res must conform to Feder­
al Safety Req uirements in add ition to these
grades .
Tread wear
The tread wear g rade is a comparative rating
based on the wear rate of the tire when tested
u nder contro lled conditions o n a specified
government test course.
F o r example, a tire gra ded 150 wo uld wear
one and one ha lf (11/2) times as well on the
government course as a ti re graded 100.

The relative perform a nee of ti res depends
upon the actua l conditions of their use, how ­
ever, and may depart sign ificantly from the
norm due to var iat ions in dr iving habits, serv­
ice practices and differences in road character­
istics and climate .
Trac tion
The traction grades, from highest to lowest,
are AA, A, Band
C. Those grades represent the
tire's ability to stop on wet pavement as measured under controlled cond itions on
specified government test surfaces of asphalt
and concrete . A tire marked C may have poor
traction performance ¢,&. .
Temp erature
The temperature grades are A (the h ighest),
B, and
C, representing the t ire's resistance to
the generat ion of heat and its ability to dissi ­
pate heat when tested under controlled condi­
tions on a specified i ndoor laboratory test
wheel.
Sustained high temperature can cause the
materia l of the tire to degenerate and reduce
tire life, and excessive temperature can lead
to sudden ti re fa ilu re ¢ ,&. .
The grade
C corresponds to a level of perform ­
ance which all passenger car tires must meet
u nder the Federa l Moto r Veh icle Safety Stand­
a rd No.
1 09. G rades Band A represent h igher
l eve ls of perfo rmance on the laboratory tes t
wheel than the m inimum required by law .
A WARNING
The traction grade assigned to this ti re is
based on stra ight-ahead b raking t raction
tests, and does not include acceleration,
cornering, hydrop lan ing or peak traction
character istics.
A WARNING
The temperature grade for this t ire is es­
tablished for a t ire that is p roperly inflated
and not overloaded. Excessive speed, un­
derinflation, or excessive loading, either
-
Tire s an d wheel s 195
separately or in combinat ion, can ca use
heat bui ldup and possible tire failure.
Winter tires
Winter tires can improve vehicle handling on
snow and ice. At temperatures below 45 °F (7 °C) we recommend changing to winter
tires.
In some heavy snow areas, local governments
may require true winter o r "snow" tires, those
with very deeply cut tread. These tires should
o nly be used in pairs and be installed o n all
four wheels . Make sure you purchase snow
t ires that are the same size and construction
type as the other tires on you r vehicle.
If your vehicle is equipped w ith all-whee l
drive*, th is w ill improve traction during winter
driv ing, even with the standa rd tires. Howev­
er, we stro ngly recommend that you always
equip all fou r whee ls o n your veh icle w ith co r­
rect ly fi tted winter tires o r all-season tires,
when w inter road condit ions are expe cted .
T his also improves the veh icle's b raking per ­
formance and reduces stopping distances.
Summe r tires provide less grip on i ce and
snow.
Winter tires (snow tires) must always be fitted
o n all fo ur wheels .
Ask your authorized Audi dealer or qualified
workshop for permitted
winter tire size s. Use
o nly rad ial w inter t ires.
Winter tires lose their effectiveness when the
tread is worn down to a depth of
0 .157 inch
(4 mm) .
Only drive w ith w inter t ires under w inter con­
dit ions. Summer t ires handle better when
there is no snow or ice on the roads and the
temperature is above 45 °F (7 °() .
If you have a flat tire, see notes on spare
whee l
¢page 191.
Please a lways remember that winter tires may
have a lowe r speed rating than the tires o rigi -
nally installed on your vehicle at the time it .,.
•
•