2018 AUDI A4 tire size

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prevent collisions -the re is still a risk of ac­
c idents!
- Press the accelerator pedal ca refully when
accelerating on smooth, slippery surfaces
such as ice and snow. The dr ive wheels can
spin even when these control systems are
installed and th is can affect driving stability
and increase the r isk of a coll is ion.
Switching on/off
Intellig ent Technology
{!) Tips
- The ABS and ASR only funct ion correct ly
when all four wheels have a sim ilar wear
condition. Different tire sizes can lead to a
reduction in engine power.
- You may hear noises when the systems de­
scribed are working.
£SC turns on automatically when you start the engine.
Fig. 1 55 Cente r co nso le w it h b utton~ °"
The following sit uat ions are exceptions where it
may be useful to switch on sport mode (sedan) or
offroad mode (allroad) to allow the whee ls to
spin :
- Rocking the vehicle to free it when it is stuck
- Dr iving in deep snow or on loose ground
- Dr iving with snow chains
- App lies to: allroad: Driv ing on ro ugh te rra in
when much of the car's weig ht i s l ifte d off the
wheels ( axle articul at ion)
The ESC is designed to fu nction in levels. Depe nd­
i ng o n the level that is selected , the s tabilization
f u nction o f the ESC is limited or switched off. The
amo unt of stabilization control will d iffer de ­
pending on t he leve l. -
App lies to: allroad: Driv ing down hill while brak­
ing on loose grou nd
Fo r yo ur safety, switch the spo rt mode/offroad
mode off in advance.
ESC levels
Applies to: sedan
Sport mode on ESC/ASR off Sport mode off or
ESC /ASRon
Behavior
The ESC and ASR stab ili za- The stabilization f unct io n is The f ull stabiliza tion f un c-
t ion f un ct ions are lim ited not avai
lab le
¢ &. . ES C and
tion of the ESC and ASR is
¢ &. . ASR are swi tched off . avai
lab le aga in.
Op eration Press the !.r, O FFI button P ress and hold the j.r, O FFI Press the j.r, O FFI button
briefly . button longer than 3 sec- aga in .
o nds.
Ind icato r II turns on. fl and jf'll•)~~ turn on. II turns off or II and
lights lf'll•U~ turn off.
Me ssages Stabilization contro
l (ESC ):
Stabilization control (ESC ): Stabilization control
s port . Warning! Restricted off. Warning! Restricted (ESC
): on
stability stability
147

Safety belts
General information
Always wear safety belts!
Wearing safety belts correctly saves lives!
This chapter explains why safety belts are neces­
sary, how they work and how to adjust and wear
them correctly.
.. Read all the information that follows and heed
all of the instructions and WARNINGS.
A WARNING
Not wearing safety belts or wearing them im­
properly increases the risk of serious personal
injury and death.
- Safety belts are the single most effective
means available to reduce the risk of serious
injury and death in automobile accidents.
For your protection and that of your passen­
gers, always correctly wear safety belts
when the vehicle is moving.
- Pregnant women, injured, o r physically
im­
paired persons must also use safety belts.
Like all vehicle occupants, they are more
likely to be seriously injured if they do not
wear safety belts. The best way to protect a
fetus is to protect the mother
-throughout
the entire pregnancy.
Number of seats
Your Audi has a total of five seating positions:
two in the front and three in the rear. Each seat­
ing position has a safety belt.
A WARNING
Not wearing safety belts or wearing them im­
properly increases the risk of serious personal
injury and death.
- Never strap more than one person, includ­
ing small children, into any belt.
It is espe­
cially dangerous to place a safety belt over a
~ child sitting on your lap.
~ -Never let mo re people ride in the vehicle
:::l than there are safety belts available. 0 0
3 Safety belts
-Be sure everyone riding in the vehicle is
properly restrained with a separate safety
belt or child restraint.
Safety belt warning light
Your vehicle has a warning system for the driver
and front seat passenger to remind you about the importance of buckling-up.
Fi g. 227 Safety belt warn ing light in the instrument clus ·
te r
-enlarged
Before driving off, always:
.. Fasten your safety belt and make sure you are
wearing it properly.
"' 0 N ... m
.,. Make sure that your passengers also buckle up
and properly wear their safety belts.
.,. Protect children with a child restraint system
appropr iate for the size and age.
The warning light . in the instrument cluster
lights up when the ignit ion is switched on as a re­
minder to fasten the safety belts . In addition,
you w ill hear a warn ing tone for a certain period
of time.
Fasten your safety belt and make sure that your
passengers also properly put on their safety
belts.
A WARNING
-
- Safety belts are the sing le most effective
means available to reduce the risk of serious
injury and death in automobile accidents.
For your protection and that of your passen­
gers, a lways correctly wear safety belts
when the vehicle is moving .
- Failure to pay attention to the warning light
that comes on could lead to personal injury.
263

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~ a:,
Bead separa tion
means a breakdown of the bond
between components in the bead.
Cord
means the strands forming the
plies in the tire .
Cold tire inflation pressure
means the tire pressure recom­
mended by the vehicle manufac­
turer for a tire of a designated size that has not been driven for
more than a couple of miles (kilo­
meters) at low speeds in the
three hour period before the tire
pressure is measured or adjusted .
Curb weight
means the weight of a motor ve­
hicle with standard equipment in­
c luding the maximum capac ity of
fuel, oi l, and coolant, a ir condi­
tioning and add itional weight of
optional equipment.
E xtra load tire
means a tire designed to operate
at higher loads and at h igher in ­
flation pressures than the corre­ sponding standard tire. Extra load
tires may be identified as
"X L",
"xl", "E XTRA LOAD" , or "RF" on
the s idewal l.
Wheels
Gross Axle Weight Rating
( " GAWR")
means the load-carrying capacity
of a single axle system, measured
at the tire -ground interfaces.
Gross Vehicle Weight Rating
(" GVWR ")
means the max imum total loaded
weight of the vehicle.
Groove
means the space between two ad­
jacent tread ribs .
Load rating (code)
means the maxim um load that a
tire is rated to carry for a given in­
flat ion pressure . You may not f ind
this informat ion on all tires be ­
cause it is not required by law.
Maximum load rating
means the load rating for a tire at
the maximum permissible infla­
tion pressure for that tire .
Maximum loaded vehicle
weight
means the sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity we ight , and
(d) Production options we ight
33 7

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~ a:,
Rim
means a metal support for a tire
or a tire and tube assembly upon
which the tire beads are seated.
Rim diameter
means nominal diameter of the
bead seat. If you change your
wheel size, you will have to pur­
chase new tires to match the new
rim diameter.
Rim size designation
means rim diameter and width.
Rim width
means nominal distance between
rim flanges .
Sidewall
means that portion of a tire be­
tween the tread and bead .
Speed rating (letter code)
means the speed at which a t ire is
designed to be driven for extend­
ed periods of time . The ratings
range f rom 93 mph (150 km/h)
to 186 mph (298 km/h)
¢ table
on page 335.
You may not find
this information on all tires be­
cause it is not required by law.
The speed rating letter code ,
w here applicable, is molded o n
the tire sidewall and indicates the
Wheels
maximum permissible roa d
speeds
¢ A in Winter tires on
page 349.
Tire pressure monitoring
system
means a system that detects
when one or more of a vehicle's
ti res are underinflated and illumi­
na tes a low tire pressure warning
telltale.
Tread
means that po rtion of a ti re that
comes i nto contact with the road .
Tread separation
means pulling away of the tread
from the tire carcass.
Treadwear indicators (TWI)
means the projections withi n the
principa l grooves desig ned to g ive
a visua l indication of the degrees
of wear of the t read. See
¢ page 343, Treadwear indicator
for mo re in fo rmat ion on meas ur­
ing t ire wear .
Uniform Tire Quality Grading
is a tire information system devel­
oped by the United Sta tes Nation­
a l Highway Traffic Safety Admin­
istration ( NHTSA) tha t is designed
to help buyers make re lat ive
339
..

for the number of seating posi­
tions. Refer to the table ¢
table
on page 346
for the number of
people that correspond to the ve­
hicle normal load.
New tires or wheels
Audi recommends having all work on tires or wheels performed by
an author ized Audi dealer or au­
thorized Audi Service Facility.
These facilities have the proper
knowledge and are equipped with
the required tools and replace­
ment parts.
.,.New tires do not yet have the
optimum gripping properties. Drive carefully and at moderate
speeds for the first 350 miles
(500 km) with new tires.
.,.Use tires of the same construc­
tion, size (rolling circumference)
and as close to the same tread
pattern as possible on all four
wheels.
.,.Do not replace tires individually .
At least replace both tires on the
same axle at the same time.
.,.Audi recommends that you use
Audi Original Tires. If you would
~ like to use different tires, please .-<
~ note that the tires may perform .-< 0
~ a:,
Wheels
differently even if they are the
same
size ¢.&,. .
.,. If you would like to equip your
vehicle with a tire/rim combina­
tion that is different from what
was installed at the factory, con­
sult with an authorized Audi
dealer or authorized Audi Service
Facility before making a pur­
chase¢ .&,..
If the spare tire is different from
the regular tires installed on the
vehicle
-for example, if winter
tires or wide tires are installed
-
then only use the spare tire tem­
porarily in case of emergency and
drive carefully while it is in use . It
should be replaced with a regular
tire as soon as possible.
On
all wheel drive vehicles, all
four wheels must be equipped
with tires that are the same brand
and have the same construction
and tread pattern so that the
drive system is not damaged by different tire speeds. For this rea­
son, in case of emergency, only
use a spare tire that has the same
circumference as the regular
tires.
341

Wheels
&,. WARNING
-Do not use steel rims that are 17 inches or larger . Other­
wise, damage to the vehicle
and an accident could result.
-For technical reasons, it is not
possible to use tires from oth­
er vehicles - in some cases,
you cannot even use tires from
the same vehicle model.
-Make sure that the tires you
select have enough clearance
to the vehicle. Replacement
tires should not be chosen
simply based on the nominal
size, because tires with a dif­
ferent construction can differ greatly even if they are the
same size . If there is not
enough clearance, the tires or
the vehicle can be damaged
and this can reduce driving
safety and increase the risk of an accident.
-Only use tires that are more than six years old when abso­
lutely necessary and drive
carefully when doing so .
-Do not use run-flat tires on your vehicle. Using them when
not permitted can lead to ve­
hicle damage or accidents.
342
-If you install wheel covers on the vehicle, make sure they al­
low enough air circulation to
cool the brake system. If they
do not, this could increase the
risk of an accident.
Tire wear /damage
Fig. 275 Tire profile: treadwear indica­
tor
Tire wear
Check the tires regularly for wear.
-Inflation pressure that is too low
or high can increase tire wear
considerably.
- Driving quickly through curves,
rapid acceleration and heavy
braking increase tire wear.
-Have an authorized Audi dealer or authorized Audi Service Facili­
ty check the wheel alignment if
there is unusual wear .
-Have the wheels rebalanced if an
imbalance is causing noticeable
vibration in the steering wheel. If you do not, the tires and other
..

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~ a:,
-The tire must flex more if the
tire pressure is too low or if
the vehicle speed or load are
too high. This heats the tire up
too much . This increases the
risk of an accident because it
can cause the tire to burst and result in loss of vehicle con­
trol.
-Incorrect tire pressure in­
creases tire wear and has a
negative effect on driving and
braking behavior, which in­
creases the risk of an accident .
(D Note
Replace lost valve caps to re­
duce the risk of damage to the
tire valves.
Tire pressure table
Please note that the information
contained in the following table
was correct at the time of print­ ing, and the information is sub­
ject to change. If there are differ­
ences between this information
and the tire pressures specified
on the label on the driver's side B­
pillar, always follow the specifica­
tion on the B -pillar label
¢ page 344, fig. 2 76.
Wheels
'® For the sake of the environment
-Tire pressure that is too low
increases fuel consumption.
-Fuel consumption may also in­
crease when driving with the
comfort tire pressure is se­
lected.
Audi recommends using the
tire pressure specified for a
normal load
¢ table on
page 346
or for a full load
when the vehicle is partially
loaded.
Make sure that the tire designa­
tion on your tire matches the des­ ignation on the tire pressure label
and the tire pressure table.
The following table lists recom­ mended tire pressures in cold
tires according to the load and
the size of the tires installed .
..
345

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Low -profile tires can wear out faster than stand­
ard tires.
Summer tires are not su itable for cold weather,
snow or b lack ice. If you are driving in these con­
ditions, use winter or all season tires
¢ page 349.
Uniform tire quality grading
-Tread wear
- Traction AA AB C
- T emperature ABC
Qual ity grades can be found where app licable on
the t ire side wa ll between tread shou lde r and
maximum sect ion w idth
¢page 334, fig. 274.
For e xample : Tread wear 200 , Traction AA, Tem­
pe rature
A .
All passenger car tires must conform to Federal
Safety Requirements in addition to these grades.
Tread w ear
The tread wear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a specified gov­
ernment test course.
F or example, a tire graded 150 would wear one
and one ha lf
(1 1/2) times as well on the govern­
ment course as a tire graded 100.
The relative performance of tires depends upon
the actual conditions of their use, however, and
may depart significant ly from the norm due to
variations in driving hab its, service practices and
d ifferences i n road characteristics and climate.
Tracti on
The traction grades, from highest to lowest, are
AA, A, Band
C. Those grades represent the tire's
ab ility to stop on wet pavement as measured un­
der controlled conditions on specified govern­
ment test surfaces of asphalt and concrete . A tire
marked C may have poor traction performance
¢ _& .
Temper ature
The temperature grades are A (the h ighest), B,
and C, representing the tire's resistance to the
Wh eel s
generat ion of heat and its ability to dissipate
heat when tested under controlled conditions on
a specified indoor laboratory test wheel.
Sustained h igh temperature can cause the mate­
ria l of the tire to degenerate and reduce tire life,
and excessive temperature can lead to sudden
tire
failure ¢.& .
The grade C corresponds to a level of per form ­
ance which all passenger car tires must meet un­
der the Federal Motor Vehicle Safety Standard
No. 109. Grades Band A represe nt higher levels
of performance on the laboratory test wheel than
the minimum requ ired by law.
A WARNING c,...._ -
The tract ion grade assigned to this t ire is
based on straight-ahead braking traction
tests, and does not include acceleration, co r­
nering, hyd roplaning or pea k traction cha rac­
terist ics.
A WARNING
The temperature grade for this tire is estab­
lished for a tire that is properly inflated and
not overloaded . Excessive speed, underinfla­
tion, or excessive loading, either separately or
i n comb inat ion, can cause heat bu ildup and
possib le tire fai lure.
A WARNING
-Temperature grades apply to tires that are
properly inflated and not over or under inflat­
ed.
Tire pressure monitoring system
ill General notes
Each tire, including the spare (if provided),
.
should be checked monthly when cold and inflat-
ed to the i nflat io n pressure recommended by the
vehicle manufacturer on the veh icle placard or
t ir e infla tion p ressure labe l. (If your ve hicle has
ti res of a different size t han t he si ze ind icated on
IIJi,-
351