2015 AUDI A4 width

112 Audi side assist
General information
App lies to vehicles: with Audi side assist
®
©
Fig. 126 Driving s it u at ions
AU Dr- l
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Fig . 12 7 Rea r of th e ve hicle: pos it io n of t he se nso rs
Side assis t fu nctions at speeds above ap prox i­
ma tely 19 mph (30 km/h).
@ V ehicles that are approaching
In certain cases, a vehicle will be classified as
cr itical for a lane change
even if it is still
somewhat far away. The fas ter a vehicle ap­
p ro aches, the sooner the disp lay in the exteri­
or m irror will t urn on.
@ Vehicles traveling with you
Vehicles traveling w ith you are indicated in the
exterior m irror if they are classified as cr it ical
for a lane change. All vehicles detec ted by
side assis t are in dicated by the time they en­
ter your "blind spot", at the latest.
© Vehicles left behind
If you s low ly pass a ve hicl e tha t sid e ass ist has
dete cted ( the difference in s peed between the
vehicle and you r vehicle is less than 9 mph
(15 km/h)), the display in the exter io r mirro r
turns on as soon as the vehicle enters your blind spot.
The disp lay wi ll not t urn on if you quickly pass
a vehicle that s ide assist has detected (t he d if ­
f erence in speed between the ve hicle and your
vehicle is greater than 9 mph (15 km/h)).
Functional limitations
T he radar senso rs are des igned to detect the
left and right adjacent lanes whe n the road
l anes a re the normal width. In certain situa­
t ions, the d isp lay in the exterior mirror may
turn on
even though there is no ve hicle locat­
ed in the area that is cr itical fo r a lane cha nge.
For example:
- if the lanes are narrow or if your are driving on the edge of your lane. If this is the case,
the system may have detected the vehicle in
another la ne that is
not adjacent to your
cur rent lane .
- if you a re driving through a c urve . Side assis t
may react to a vehicle that is one lane ove r
from the ad jacent lane .
- if side assist reacts to other objects (such as
high or d isp laced gua rd rails) .
- In poor weather conditions. The side assist fu nctions are limited .
Do not
cover the radar sensors c:;, fig. 127 with
stickers, depos its, bicycle wheels or other ob­
jects , because this will affect the funct ion. Do
not use s ide ass ist when tow ing a trail er. For
information on cleaning, refe r to
c:;, page 202 .
&_ WARNING
-Always pay a tten tion t o traffic and to the
ar ea around your ve hicl e. Side a ssist can ­
no t repla ce a driver's attention. The driv ­
er a lone is always respons ible fo r lane
cha nges a nd similar driving mane uvers.

-If you notice unusual vibra­tion or if the vehicle pulls to one side when driving, 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 de­
signed for the conditions
that are typical in those sea­
sons. Audi recommends us­ing winter tires during the
winter months. Low tem­ peratures significantly de­
crease the elasticity of
summer tires, which affects
traction and braking ability.
Tires and wheels 229
If summer tires are used in
very cold temperatures, cracks can form on the tread bars, resulting in perma­
nent tire damage that can
cause loud driving noise and unbalanced tires. Audi is not
responsible for this type of
damage.
-Burnished, polished or chromed rims must not be used in winter road condi­
tions. The surface of the
rims does not have suffi­
cient corrosion protection
for this and could be perma­
nently damaged by road salt
or similar substances.
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Glossary of tire and loading terminology
Accessory weight
means the combined weight (in
excess of those standard items
which may be replaced) of auto­ matic transmission, power
steering, power brakes, power
windows, power seats, radio, and heater, to the extent that
these items are available as fac­
tory-installed equipment (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 indi­
cate a low sidewall for im­ proved steering response and
better overall handling on dry
pavement.

Maximum load rating
means the load rating for a tire
at the maximum permissible in­
flation pressure for that tire.
Maximum loaded vehicle
weight
means the sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight, and
(d) Production options weight
Maximum (permissible)
inflation pressure
means the maximum cold infla ­
tion pressure to which a tire
may be inflated. Also called
"maximum inflation pressure."
Normal occupant weight
means 150 lbs. (68 kilograms)
times the number of occupants seated in the vehicle up to the
total seating capacity of your
vehicle.
Occupant distribution
means distribution of occu­ pants in a vehicle.
Outer diameter
means the overall diameter of
an inflated new tire.
Tires and wheels 231
Overall width
means the linear distance be­
tween the exteriors of the side­
walls of an inflated tire, includ­ ing elevations due to labeling,
decorations, or protective bands or ribs.
Ply
means a layer of rubber-coated
parallel cords.
Production options weight
means the combined weight of
those installed regular produc­
tion options weighing over 5 lbs. (2 . 3 kg) in excess of those
standard items which they re­ place, not previously consid­
ered in curb weight or accessory
weight, including heavy duty
brakes, ride levelers, roof rack,
heavy duty battery , and special
trim.
Radial ply tire
means a pneumatic tire in
which the ply cords that extend
to the beads are laid at sub­ stantially 90 degrees to the
centerline of the tread.
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232 Tires a nd whee ls
Recommended inflation
pressure
see c:::> page 230, Cold tire infla­
tion pressure.
Reinforced tire
means a tire design to operate
at higher loads and at higher
inflation pressures than the
corresponding standard t ire .
Reinforced tires may be identi ­
fied as "XL", "xl", "EXTRA
LOAD", or "RF" on the sidewa ll.
Rim
means a meta l 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 yo u change your
wheel size, you will have to pur­
chase new t ires to ma tch the
new rim d iameter .
Rim size designation
means rim diameter and width.
Rim width
means nom inal distance be­
tween rim flanges.
Sidewall
means that por tion of a tire be­
tween the tread and bead.
Speed rating (letter code)
means the speed at wh ich a tire
is designed to be driven for ex­
tended periods of time . The rat­
ings range from 93 mph
( 1 50 km/h) to 186 mph
( 2 98 km/h)
c:::> page 2 50. You
may not find th is informat ion
on all tires because it is not re­
quired by law.
The speed rati ng letter code,
where applicable, is molded on
the ti re sidewall and ind icates
the maximum permissible road
speeds
c:::> & in Winter tires on
page 255.
Tire pressure monitoring
system*
means a system that detects
when one or more of a vehicle's
tires are underinflate d an d ill u­
minates a low tire press ure
warn ing telltale.
Tread
means that por tion o f a tire
that comes into contact with
the road.

248 Tires and wheels
New tires and replacing
tires and wheels
New tires and wheels have to
be broken in.
Fig. 193 Tire specification codes on
the sidewall of a tire
No. Description
CD Passenger car tire (where
applicable)
@ Nominal width of tire in
millimeters
@ Ratio of height to width
(aspect ratio)
© Radial
® Rim diameter code
® Load index and speed rat-
1ng
(j) U.S. DOT tire identifica -
tion number
No. Description
® Audi Original tire
® Sever snow conditions
@ Tire ply composition and
materials used
@ Maximum load rating
@ Treadwear, traction and
temperature grades
@ Maximum permissible in-
flation pressure
The tires and rims are essential
parts of the vehicle's design.
The tires and rims approved by
Audi are specially matched to
the characteristics of the vehi­
cle and can make a major con­
tribution to good road holding and safe handling when in good
condition and properly inflated
¢ A .
We recommend that all work
on tires and wheels be per­
formed by an authorized Audi
dealer. They are familiar with recommended procedures and
have the necessary special tools
and spare parts as well as the
proper facilities for disposing of
the old tires.
Authorized Audi dealers have
the necessary information

250 Tires and wheels
p Indicates the tire is for pas-
senger cars (where applica- ble)
255 Nominal tire width in mm
of the tire from sidewall
edge to sidewall edge. In
general, the larger the num-
ber, the wider the tire
35 Height/width ratio in per-
cent (aspect ratio)
R Tire construction: Radial
19 Rim diameter code (in in-
ches)
96 Load rating code
Y Speed rating letter code
XL (or "xl" "EXTRA LOAD" or , 1
"RF" Indicates that the tire is
a"Reinforced" or an "Extra
Load" tire
M+S (or "M/5") Indicates that
the tire has some mud and snow capability
The tires could also have the in-
formation of direction of rota-
tion
c:::> page 228.
Tire manufacturing date
The manufacturing date is also
indicated on the tire sidewall
l ) For t ires with a maximum speed ca­
pability ov er 149 mph (240 km/h) ,
tire manufacturers sometimes use
the letters "ZR."
(possibly only on the inner side
of the wheel):
"DOT ... 2214 ... " means, for
example, that the tire was pro-
duced in the 22nd week of
2014.
Speed rating (letter code)
The speed rating letter code on
the wheels indicates the maxi -
mum permissible road speeds
c:::> A in Winter tires on
page 255.
P up to 93 mph (150 km/h)
Q up to 99 mph (158 km/h)
R up to 106 mph (170 km/h)
s up to 110 mph (180 km/h)
T up to 118 mph (190 km/h)
u up to 124 mph (200 km/h)
H up to 130 mph (210 km/h)
V up to 149 mph (240 km/h)1
)
z over 149 mph (240 km/h)1)
W up to 168 mph (270 km/h)1
)
Y up to 186 mph (298 km/h)1)
Your vehicle is normally factory
equipped with tires, which pos-
sess excellent driving character- istics and give your Audi
....

254 Tires and wheels
@ For the sake of the environment
Dispo se of old tires in accord­
ance with the local require­
ments.
Uniform tire quality grading
- Tread wear
- T raction AA A B C
- T empera ture ABC
Quality grades can be found where applicable
on the tire side wa ll between tread shou lder
and max imum sect ion width
¢ page 248,
fig. 193.
For example: Tread wear 200, Tract ion AA ,
Temperature A.
All passenger car tires must conform to Feder­
al Safety Requirements in addition to these
grades.
Tread wear
The tread wear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a spec ified
government test course .
For example, a t ire graded 150 would wear
one and one half (1 1/2) t imes as well on the
government course as a tire graded 100.
The relat ive performance of t ires depends
upon the actua l conditions of their use, how­
ever, and may depart significantly from the norm due to var iations in dr iving habits, serv­
ice practices and differences in road character­
istics and climate .
Traction
The traction grades, from highest to lowest,
are AA, A, Band
C. Those grades represent the
tire's abil ity to stop on wet pavement as
measured under controlled cond it ions on
specified government test surfaces of asphalt
and concrete . A tire marked C may have poor
trac tion performance ¢&,. .
Temperature
The temperature grades are A (the highest),
B, and C, representing the tire's resistance to
the generation of heat and its ability to dissi­
pate heat when tested under controlled condi­
tions on a specified indoor laboratory test
wheel.
Sustained high temperature can cause the
material of the tire to degenerate and red uce
tire life, and excessive temperature can lead
to sudden tire failure
¢ &,..
The grade C corresponds to a level of perform ­
ance which all passenger car tires must meet
under the Federal Motor Vehicle Safety Stand­
ard No. 109. Grades Band A represent higher
levels of performance on the laboratory test
wheel than the minimum required by law .
A WARNING
The traction grade assigned to this tire is
based on straight-ahead braking traction
tests, and does not include acceleration,
cornering, hydroplaning or peak traction
characteristics.
A WARNING
The temperature grade for this tire is es ­
tablished for a tire that is properly inflated
and not overloaded. Excessive speed, un­
derinflation, or excessive load ing, either
separately or in combination, can cause
heat buildup 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 or "snow" tir es, those
with very deeply cut tread . These tires should
only be used in pairs and be installed on all
four wheels. Make sure you purchase snow
tires that are the same size and construction
type as the other tires on your vehicle. .,.

'"" N
0 ::.,: co ,...., \!) 1.1'1 ,...., 1.1'1 ,....,
and handling under a variety of driving condi­
tions . Ask your authorized Audi dealer for
more details.
The low aspect ratio of these tires is indicated
by a numeral of
55 or less in the tire's size
designation. The numeral represents the ratio
of the tire's sidewa ll height in relation to its
tread width expressed in percentage . Conven­
tional tires have a height/width ratio of 60 or
more .
The performance 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 always before a long trip
¢ page 239, Checking tire pressure.
What you can do to avoid tire and rim
damage
Low aspect ratio tires can be damaged more
easily by impact with potho les, curbs, gullies
or ridges on the road, particularly if the tire is
underinflated .
In order to minimize the occurrence of impa ct
damage to the tires of your vehicle, we recom­
mend that you observe the following precau­
tions:
- Always maintain recommended inflation
pressures. Check your tire pressure every
2,000 miles (3,000 km) and add air if neces­
sary .
- Drive carefully on roads with potholes, deep
gullies or ridges. The impact from driving
t hr ough or over such obstacles can damage
your tires. Impact with a curb may also cause damage to your tires.
- After any impact, immediately inspect your
t ir es or have them inspected by the nearest
authorized Aud i dealer. Replace a damaged
t ir e as soo n as possible .
- Inspect your t ires every 2,000 miles (3,000
km) for damage and wear . Damage is not al­
ways easy to see . Damage can lead to loss of
air and underinflation, wh ich could eventu-
Tires and wheels 257
ally cause tire failure. If you believe that a
tire may have been damaged, rep lace the
tire as soon as possib le.
- These tires may wear more quickly than oth­
ers.
- Please also remembe r that, while these tires
deliver responsive handling, they may ride
less comfortably and make more noise than
other choices.
Reduced performance in winter/cold
season conditions
All tires are designed for certain purposes.
The low aspect ratio, ultra high performance
tires or iginally installed on your vehicle are in­
tended for maximum dry and wet road per­
formance and handling. They are not suitable
for cold, snowy o r icy weather conditions. If
you drive under those circumstances, you
should equip your vehi cle w ith all-season or
winter tires, which offer better traction under
those conditions. We suggest you use the rec ­
ommended snow or a ll-season tires specified
for your vehicle, or their equivalent .
Refer to¢
page 254 for more detailed infor­
mation regarding winter tires.
Ti re pressure
monitoring system
ill General notes
Applies to vehicles: with tire pressure monitoring system
Each tire, including the spare (if provided),
sho uld be checked monthly when cold and in ­
flated to the inflation pressure recommended by the veh icle manufacturer on the veh icle
placard or tire inflation pressure label. (If your
vehicle has tires of a d ifferent size than the
s ize indicated on the vehicle placard or tire in ­
flat io n pressure label, you should determine
the proper t ire inflation pressu re for those
tires).
As an added safety feature , your veh icle has
been equipped with a tire pressure mon itoring
system (TPMS) that illum inates a low ti re
pressure te llt ale when one or more of your
tires is significantly under-inflated. .,.
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