change wheel AUDI A5 COUPE 2018 User Guide

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-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 a veh icle in another
lane that is
not adjacent to your current lane.
-If you are driving through a curve . Side assist
may react to a vehicle that is in the same lane
or one lane over from the adjacent lane.
-If side assist reacts to other objects (such as
roadside structures like guard rails).
-In poor weather conditions . The side assist
functions are limited.
Do not cover the radar
sensors ¢ fig. 134 with
stickers, deposits, bicycle whee ls or other ob­
jects, because this wi ll impa ir the function. Do
not use side assist when towing a trailer. For in­
formation on cleaning, see
¢page 362 .
A WARNING
-Always pay attention to traffic and to the
area around your vehicle. Side assist cannot replace a dr iver's attention. The dr iver alone
is a lways responsib le for lane changes and
similar d riving maneuvers.
-In some situat ions, the system may not
function or its funct ion may be limited. For
example:
-If vehicles are approach ing or being left
behind very quickly. The display may not
turn on in t ime.
-In poor weather conditions such as heavy
rain, snow or heavy mist.
-On very wide lanes, in tight curves, or if
there is a rise in the road surface. Vehicles
in the adjacent lane may not be detected
because they are outs ide of the sensor
range.
(D Note
The sensors can be displaced by impacts or damage to the bumper, wheel housing and
underbody. Th is can impa ir the system . Have
an authorized Audi dealer or authorized Audi
Serv ice Facility check their function.
-If the window glass in the driver's door or
front passenger 's doo r has been t inted, the
-
A ss ista nce sys te m s
display in the exterior mirror may be incor ­
rect.
-For an exp lanat ion on con formity w ith the
FCC regulat ions in the United States and the
Industry Canada regulations, see
¢ page 392.
Switching on/off
Applies to : vehicles wit h Aud i s ide ass ist
The system con be switched on/off in the Info­
tainment system .
If the system is activated , the disp lays in the ex­
terior mirrors will turn on briefly when the igni ­
tion is switched on .
.,. Select in the Infotainment system: I MENU! but­
ton
> V ehicle > left control b utton > D riv er as­
s istance
> Audi side a ssist. Off switches the
system off.
(D Tips
When yo u switch side assist on or off, the ex it
warning system activates or deactivates
¢ page 136 .
Setting the display brightness
Applies to : vehicles wit h Aud i s ide ass ist
The display brightness con be adjusted in the In ­
fotainment system.
.,. Sele ct in the Infotainment system: I MENU ! but­
t on
> Veh icle > left control b utton > D riv er as­
s istance
> Audi side a ssist.
The disp lay brightness adjusts automatically to
the brightness o f the surroundings, bo th in the
information and in the warning stage . In very
dark or very bright surround ings, the automatic
adjustment will set the display to the minim um
or max imum level. In such cases, you may notice
no change when adjusting the br ightness, or the
change may only be noticeable once the sur ­
roundings cha nge .
Adjust the br ightness to a leve l where the display
in the information stage will not disrupt your
view ahead . If you change the brightness, the d is-
play in the exterior mirror will br iefly show the
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Description
Applies to: vehicles with Audi drive select
The following systems, among other things, are
influenced by drive select:
Engine and automatic transmission*
Depending on the mode, the engine and auto­
mat ic transmission* respond more quickly or in a
more balanced manner to accelerator pedal
movements. In the sporty
Dynamic mode, the
transmission shifts at highe r speed ranges.
Suspension control*
The suspension control* uses sensors to record
information regarding steering movements,
braking and acceleration operations by the driv­
e r, road sur face, dr iv ing speed, and load. This
makes it possible to adapt damping to the driv­
ing situation nearly in rea l time. With drive se ­
lect, you can adjust the suspension control to be
sporty
( Dynamic ), comfortab le ( Comfort ) or bal­
anced
( Auto ).
Steering
The power steering adapts. Indirect steer ing that
moves easi ly as in
Comfort mode is especia lly
suited to long drives on highways. The
Dynamic
mode provides sporty, direct steering.
The following applies to vehicles with dynamic
steering*: the steering ratio changes based on
vehicle speed in order to maintain optimum
steering effort for the driver at all times. This
sets the steer ing to be less sensitive at higher
speeds in order to provide improved vehicle con­
trol. At reduced speeds, steering is more direct in
order to keep the steering effort as min imal as
possible w hen the driver is maneuvering the vehi­
cle . At low and average speeds, dynam ic steer­
in g* add itionally provides more responsive steer­
ing performance.
Sport differential*
As a component of the all wheel drive system
(quattro)
~ page 154, the sport differential dis­
tr ibu tes the dr iv in g power to the rear ax le de­
pending on the situation. The distribution of
power varies depending on the selected mode
Assistance systems
from moderate (Comfort ) to sporty (Dynamic ).
The goal is a high level of agility and ability to ac­
ce lerate on curves . T he vehicle is very responsive
to steering.
Adaptive cruise control (ACC)*
The behavior when accelerating can be adjusted
from comfortable to sporty, depending on the
drive select mode. Adaptive cruise control also
responds to the driving behavior of the vehicle
ahead in a more conservative or sporty manner.
Engine sound*
The engine sound adapts to the current mode
and can be subtle to sporty.
(D Tips
The S selecto r lever position automatically en­
gages when the
Dynamic mode is selected .
Selecting the driving mode
Applies to: vehicles with Aud i drive select
Fig . 139 Cen ter co nsole: con trols for d rive se lect
.. Press the left or right a rrow key ~fig. 139 until
t he desired mode appears in the instrumen t
cluster/ Infotainment system display. Or
.. Select in the Infotainment system: I MENU ! but-
ton
> Vehicle > Audi drive select.
.. Select and confirm the desired setting .
You can change the driving mode when the vehi-
cle is stationary or while driving. If traffic per-
mits, after changing modes, briefly take your
foot
off the accelerator pedal so that the recently
selected mode is also activated for the engine.
Comfort -provides a comfort-oriented vehicle
setup and is suit ed for long drives on highways.
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Parking systems
General information
Applies to: ve hicles with a rea r parking sys te m /pa rking sys­
tem plus/rearv iew camera/peripheral cameras
Depending on your vehicle's equipment, various
parking aids will help you when parking and ma­
neuvering.
The
rear parking system is an audible parking aid
that warns you of obstacles
behind the vehicle
¢page 142.
T he
parking system plus assists you when park ­
ing by audibly and visually indicating objects de­
tected
in front of and behind the vehicle
¢ page 142.
T he
rearview camera shows the area behind the
vehicle in the Infotainment system display . The
lines in the rearview camera image help you to
park or maneuver ¢
page 143. The parking sys­
tem plus functions are also available
¢ page 142.
The
peripheral cameras give various views to
help you when parking or maneuvering
¢
page 145 . The parking system plus functions
are also available
¢ page 142.
A WARNING
-Always look for traffic and check the area
around your vehicle by looking at it directly
as well. The parking system cannot replace
the driver's attention. The driver is always
responsible when entering or leaving a park­
ing space and during similar maneuvers .
-
-Please note that some surfaces, such as
clothing, are not detected by the system .
-Sensors and cameras have blind spots in
which people and objects cannot be detect­
ed . Be especially cautious of small children
and animals.
-Always keep your eyes on the vehicle's sur ­
roundings, using the rearview mirror as
well.
-The sensors can be displaced by impacts or
damage to the radiator grille, bumper,
wheel housing and the underbody . The park­
ing system may be impaired as a result.
Parking systems
Have an authorized Audi dealer or author­
ized Audi Service Facility check their func­
tion.
(D Note
-Some objects are not detected or displayed
by the system under certain circumstances:
-objects such as barrier chains, trailer draw bars, vertical poles or fences
-objects above the sensors such as wall ex ­
tensions
-objects with certain surfaces or structures
such as chain link fences or powder snow
-If you continue driving closer to a low ob­
ject, it may disappear from the sensor
range . Note that you will no longer be
warned about this obstacle.
-Keep enough distance from the curb to re ­
duce the risk of damage to the rims.
(!) Tips
-The system may provide a warning even
though there are no obstacles in the cover ­
age area in some situations, such as:
-certain road surfaces or when there is tall
grass
-external ultrasonic sources such as from
cleaning vehicles
-in heavy rain, snow, or thick vehicle ex­
haust
-We recommend that you practice parking in
a traffic-free location or parking lot to be­
come familiar with the system. When doing
this, there should be good light and weath­
er conditions .
-You can change the volume of the signals
and the display ¢
page 148.
-Please refer to the instructions for towing a
trailer located in
¢page 149.
-What appears in the infotainment display is
somewhat time-delayed.
-The sensors must be kept clean and free of
snow and ice for the parking aid to operate.
141

Switching off
• Drive faster than 6 mph (10 km/h), or
• Press the p,,,A button, or
• Switch the ignition off.
(D Tips
-The visual display in the r ight part of the
display should help you detect the critica l
vehicle area.
- You can change the volume of the signals
and the display
c:!) page 148.
Perpendicular parking
Applies to: vehicles with rearview came ra
This view may be used when parking in a garage
or in a parking space.
Fig. 146 Infotainment system: aiming at a parking space
Fig . 147 Infotainment sys tem: aligning th e vehicle
• Turn the Infotainment system on and sh ift into
reverse gear.
• The orange orientation lines (D show the vehi­
cl e's direction of travel. Turn the steering wheel
until the orange orientat ion lines appear in the
parking
space ¢ fig. 146. Use the marking s@
to help you estimate the distance to an obsta­
cle. Each marking represents approximately 3
ft (1 rn). The blue area represents an extension
of the vehicle's outline by approx imately 16 ft
(5 meters) to the rear.
Parking systems
• While driving in reverse gear, adjust the steer­
ing wheel angle to fit the parking space using
the orange or ientation lines for assistance
¢ &. in General information on page 144, ¢(D
in General information on page 144. ® repre­
sents the rear bumper. At the very latest, stop
the vehicle when the red or ientat io n
line ©
borders an object.
Trailer view
Applies to: vehicles with rearview camera/peripheral cameras
and trailer hitch
This view assists you in positioning the vehicle in
front of a trailer.
Fig. 148 Infota inment system: trailer view
Requirement: Trailer view must be selected
¢page 148.
• Now you can position your vehicle in front of
the trailer
c:!) &. in General information on
page 146,
¢ (D in General information on
page 146.
The orange orientation line indi­
cates the expected path toward the trai ler
h itch. Use the blue lines to help you estimate
the distance to the tra iler hitch.
Peripheral cameras
Introduction
Applies to: vehicles wit h periph eral cameras
With this equipment, the parking system plus*
c:> page 142 is supplemented with various periph­
eral cameras. The four cameras give you the fo l­
lowing views: area around the vehicle, front cor­
ner view and rear corner view, view in front of the
vehicle and behind the vehicle.
145

Parking systems
General information
Applies to: ve hicles w ith per ip heral cameras
Fig . 149 Location of peripheral cam eras
The four periphe ral cameras are located in the ra­
diator grille , in the luggage compartment lid and
on both exterior mirrors
Q fig . 149 . Make sure
that the lenses are not covered by deposits or any
other obstructions as this may impair the system.
For information on cleaning, see
Q page 362.
Black corners are shown in the vehicle silhouette
when in
Surroundings mode. Objects in these
areas are outside of the camera's field of view
and are not detected.
& WARNING
- Always read and follow the applicable warn­
ings
Q .&. in General information on
page 141.
- If the position or the installation angle of a camera was changed, for example after a
collision, do not continue to use the system
for safety reasons. Have it checked by an au­
thorized Audi dealer or authorized Audi
Service Facility.
- Keep in mind that the image in the display is
incorrect if the exterior mirror housing has
been moved out of place .
- Use the
Rear mode and the Corner view
(rear)
mode only when the luggage com­
partment lid is completely closed . Other­
wise the image in the display will be incor­
rect.
- The vehicle surroundings are shown using
the camera images . The vehicle image is
shown by the system. Objects and obstacles above the camera are not displayed.
146
- Camera lenses enlarge and distort the field
of vision. The objects appear both altered
and inaccurate on the screen.
(D Note
-Always read and follow the applicable warn­
ings
Q (i) in General information on
page 141.
- The Infotainment disp lay shows the direc ­
tion in which the rear of the vehicle is travel­ ing based on the steering wheel angle. The
front of the vehicle swings out more than
the rear of the vehicle. Maintain plenty of
distance so that an exterior mirror or a cor­
ner of the vehicle does not collide with any
obstacles.
@ Tips
If the 8/~/c:s symbol appears in the dis­
play and the respective display area is grayed
out, then the power exterior mirrors
were
folded in or the driver's door/front passeng­
er's door/luggage compartment lid was
opened.
Switching on/off
Applies to: vehicles wit h peripheral ca meras
Fig. 150 Ce nte r console: butto n ~i
Fig. 151 Infot ainment system : select the mode

Voice recognition system Operating
Appl ies to: veh icles wit h vo ice recog nitio n system
You con operate many Infotainment functions
conveniently by speaking .
Requirements: the ignition and the MM I must be
switched on
~page 158, the re must not be any
phone call in progress and the park ing system
must not be active.
~ Switching on : press the 51 button@
~ page 15, fig. 11 or~ page 16, fig. 13 briefly
on the mu ltifunction steering wheel and say
the des ired command after the
Beep .
~ Switching off : press and hold the 51 button.
Or: press the [2] butto n.
~ Pau sing : say the command Pau se . To resume,
press the
l2;J button .
~ Correcting : say the command Corre ction . Or :
simply say a new command during an an ­
nouncement
<=> page 251.
Input assistance
The system gu ides you throug h the input with
v isua l and audio feedbac k.
- Vi sua l input as sistan ce: after switching on
vo ice recogn it io n, a display w ith a selection of
poss ible commands appears. This command
display can be sw itched on o r off. Se lect:
IMENU I button> Setting s> left cont rol button
> MMI setting s > Speech dialog system .
- Audio input a ssis tance :
to have the poss ible
commands read, tu rn the voice recognition sys ­
tem on and say
Help.
For the s yst em to understand you:
Speak clearly and dist inctly at a normal vo lume .
Speak louder when d riving faste r.
Emphasize the words in the commands evenly
and do not leave long pauses .
C lose the doors, the windows and the sunroof* to
reduce background noise . Make sure that passen-
;;!; gers are not speaking when you are giving a voice
;::; command. ,....
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3 Voice recognition system
Do not direct the air vents toward the hands-free
microphone, which is on the roof headliner near
t h e front inte rior lights .
Only use the system from the dr iver's seat be­
ca use the hands -free microphone is directed to­
ward that seat.
Additional settings
Seer=;, page 251, Spee ch dialog system .
A WARNING
-Direct your full attention to dr iv ing. As the
driver, you have complete responsibility for
safety in traffic . Only use the functions in
such a way that you a lways maintain com­
p lete contro l over your vehicle in all traffic
situations.
-Do not use the voice recognition system in
emergencies beca use your voice may change
in stressful situations. It may take longer to
d ial the number or the system may not be
able to dial it at all. Dial the emergency
number manually.
@ Tips
- The d ialog pauses when there is an incom­
ing phone call and will continue if you ig­
nore the call. The d ialog ends if you answer
the ca ll.
- You can select an item in the list using ei­
ther the vo ice recognit ion system or the
cont rol knob .
Command overview
information
Appl ies to: ve hicles w ith vo ice recognit ion system
T he following overv iews describe the comma nds
t h at can be used to operate the MMI using the
voice recognition system.
Alte rnative commands a re separate d using
a"/",
for example say: Telephone / (or) Navigation /
(or) Radio.
Sequences of commands used to perfo rm an ac­
t ion are iden tified w it h
a"> ", fo r ex ample say:
Ente r addre ss > (t hen) Enter country /state . ..,.
171

Airbag system
airbag inflates -even with an Advanced Airbag
System.
- The inflating airbag will hit the child safety
seat or infant carrier with great force and
will smash the child safety seat and child
against the backrest, center armrest, door or roof .
- Always install rear-facing child safety seats
on the rear seat .
- If you must install a rearward-facing child
safety seat on the front passenger seat be­
cause of exceptional circumstances and the
PASSENGER AIR BAG OFF~; light does not
come on and stay on, immediately install
the rear-facing child safety seat in a rear
seating position and have the airbag system inspected by your authorized Audi dealer.
A WARNING
Objects between you and the airbag will in­
crease the risk of injury in a crash by interfer­
ing with the way the airbag unfolds or by be­
ing pushed into you as the airbag inflates.
- Never hold things in your hands or on your
lap when the vehicle is in use.
- Never transport items on or in the area of
the front passenger seat. Objects could move into the area of the front airbags dur­
ing braking or other sudden maneuvers and
become dangerous projectiles that can
cause serious personal injury if the airbags
inflate .
- Never place or attach accessories or other
objects (such as cupholders, telephone
brackets, large, heavy or bulky objects) on
the doors, over or near the area marked "AIRBAG'' on the steering wheel, instru­
ment panel, seat backrests or between
those areas and yourself. These objects could cause injury in a crash, especially
when the airbags inflate.
- Never recline the front passenger's seat to
transport objects. Items can also move into
the area of the side airbag or the front air­ bag during braking or in a sudden maneu­
ver. Objects near the airbags can become
288
-
projectiles and cause injury, particularly
when the seat is reclined .
- Never place or transport objects on the
front passenger seat. Objects on the front passenger seat could cause the capacitive
sensor in the seat to signal to airbag system
that the seat is occupied by a person when it
in fact is not, or that the person on the seat
is heavier than he or she actually is. The
change in electric capacitance because of
such objects can cause the passenger front
airbag to be turned on when it should be
off, or can cause the airbag to work in a way
that is different from the way it would have
worked without objects on the seat.
- Always make sure that there is nothing on
the front passenger seat that will cause the
capacitive passenger detection system in
the seat to signal to the Airbag System that
the seat is occupied by a person when it is not , or to signal that it is occupied by some­
one who is heavier than the person actually
sitting on the seat. The presence of an ob­
ject could cause the passenger front airbag
to be turned on when it should be off, or
could cause the airbag to work in a way that
is different from the way it would have
worked without the object on the seat.
A WARNING
The fine dust created when airbags deploy can cause breathing problems for people with a history of asthma or other breathing condi­
tions .
- To reduce the risk of breathing problems,
those with asthma or other respiratory con­ ditions should get fresh air right away by
getting out of the vehicle or opening win­
dows or doors.
- If you are in a collision in which airbags de­
ploy, wash your hands and face with mild
soap and water before eating.
- Be careful not to get the dust into your eyes,
or into any cuts or scratches.
- If the residue should get into your eyes,
flush them with water .

Airbag syste m
Make sure that the PASSENGER AIR BAG
OFF
11;; li ght comes on and stays on all t he
t ime whenever the ignition is switched on.
A WARNING
- If the PA SSEN GER AIR BAG OFF 11;; light
does not go out when an adult is si tting on
the front passe nger seat a fter ta king the
steps described above, make sure the adult is p roperly seated and restrained at one of
the rear seating positions.
- Have the airbag system inspected by your
authorized Aud i dealer before transporting
anyone on the front passenger seat.
@ Tips
If the capacitive passenger detection system
determines that the front passenger seat is
empty, the frontal airbag on the passenge r
side w ill be tu rned off, and the
PASSENGER
AIR BAG OFF
11;; light will stay on.
-
Repair , care and disposal of the airbags
Parts of the a irbag system are installed at many
different places on your Audi. Installing, remov­ ing, servic ing or repa iring a part in an area of the
ve hicle can damage a part of an airbag system
and prevent that system from working properly
i n a collision .
There are some important things you have to
know to make sure that the effectiveness of the
system w ill not be impaired and that discarded
components do not cause injury or pollute the
env ironment.
A WARNING
Improper care, serv icing and repai r proce­
dures can increase the r is k of personal injury
and death by preventing an airbag from de­
ploying when needed or dep loying an airbag
unexpectedly:
-
- Never cover, obstruct, or change the stee r­
ing wheel horn pad or airbag cover or the in­
strument pane l or modify them in any way.
292
- Never attach any objects s uch as c upholders
or telephone mountings to the surfaces cov­
ering the a irbag un its.
- For cleaning the horn pad or instrument
panel, use only a soft, dry cloth or one mois­
tened w ith plain water. Solvents or cleaners
could damage the airbag cover or change
the st iffness or strength of the material so
that the airbag canno t deploy and p rotect
properly.
- Never repair, adjust , or change any parts of
the airbag system.
- All work on the steering wheel, inst rument
panel, front seats or e lectr ica l system ( in­
cluding the installation of a udio eq uipment,
cellular telephones and C B radios, etc.)
m ust be perfo rmed by a qualified techn ician
who has the training and specia l equipment
necessary.
- For any work on the airbag system, we strong ly recommend that you see your au­
thorized A udi dealer or qualified workshop.
- Never modify the front b umper or parts of
the vehicle body.
- Always make sure that the side a irbag can
inflate w ithout interference:
- Never install seat covers or replacement
u pholstery over the front seatbacks that
have not been specifically approved by
A udi.
- Never use additional seat c ushions that
cover the areas where the side airbags in­
flate.
- Damage to the orig inal seat cove rs or to
the seam in the area of the s ide airbag
module mus t always be repaired immedi­
ate ly by an autho riz ed Au di dealer.
- The a irbag system can deploy on ly once. Af­
ter an airbag h as been deployed, i t m ust be
repla ced with new replacement parts de­
signed and approved espec ia lly for your
Audi model version . Replacement of com­
plete airbag systems or airbag components
must be perfo rmed by qua lified workshops
only. Make su re that any airbag service ac­
tion is entered in your A udi Warranty
&
Ma intenance boo klet under AIRBAG RE-
PLAC EM EN T RECORD.
~

Child safety
-Always make sure that the PASSENGER
AIR BAG
OFF~; light comes on and stays
on all the time whenever the ignition is
switched on .
- If the
PASSENGER AIR BAG OFF~; light
does not come on and stay on, immediate­
ly install the forward-facing child seat in a
rear seating position and have the airbag
system inspected by your authorized Audi
dealer.
- Always buckle the child seat firmly in
place even if a child is not sitting in it. A
loose child seat can fly around during a
sudden stop or in a collision.
-Always read and heed all WARNINGS
whenever using a child restraint in a vehi­
cle ¢
page 268, Safety belts , ~ page 2 77,
Airbag system and ~ page 302, Impor­
tant information.
(D Tips
Always replace child restraints that were in­
stalled in a vehicle during a crash. Damage to
a child restraint that is not visible could cause
it to fail in another collision situation.
Advanced front airbag system and children
Your vehicle is equipped with an "Advanced Air­
bag System" in compliance with United St ates
Federal Motor Vehicle Safety Standard (FMVSS)
208, as well as Canada Motor Vehicle Safety
Standard (CMVSS) 208 as applicable at the time
your vehicle was manufactured.
The Advanced Airbag system in your vehicle has
been certified to meet the "low-risk " require­
ments for 3- and 6-year old children on the pas­
senger side and small adults on the driver side.
The low risk deployment criteria are intended to
reduce the risk of injury through interaction with
the airbag that can occur, for example, by being
too close to the steering wheel and instrument
panel when the airbag inflates. In addition, the
system has been certified to comply with the
"suppression" requirements of the Safety Stand­
ard, to turn off the front airbag for infants up to 12 months who are restrained on the front pas-
304
senger seat in child restraints that are listed in
the Standard.
Even though your vehicle is equipped with an Ad­
vanced Airbag system, all children, especially
those 12 years and younger, should always ride
in the back seat properly restrained for their age
and size. The airbag on the passenger side makes
the front seat a potentially dangerous place for a child to ride. The front seat is not the safest place
for a child in a forward-facing child safety seat. It
can be a very dangerous place for an infant or a
larger child in a rearward-facing seat.
The vehicle's Advanced Airbag System has a ca­ pacitive passenger detection system in the front
passenger seat cushion that can detect the pres­
ence of a baby or a child in a child restraint sys­
tem on this seat.
The capacitive passenger detection system regis ­
ters the changes that result in an electrical field
when a child, a child restraint , and a baby blanket
are on the front passenger seat. The change in
the measured capacitance due to the presence of
a child, a child restraint, and a baby blanket on
the front passenger seat is related to the child
restraint system resting on the seat. The meas­
ured capacitance of a child restraint system var­
ies depending on the type of system and specific
make and model.
The electrical capacitance of the various types, makes, and models of child restraints specified
by the U.S.National Highway Traffic Safety Ad­
ministration (NHTSA) in the relevant safety
standard are stored in the Advanced Airbag Sys ­
tem control unit together with the capacitances
typical of infants and a 1-year old child. When a
child restraint is used on the front passenger
seat with a typical 1 year-old infant, the Ad­
vanced Airbag System compares the capacitance
measured by the capacitive passenger detection
system with the data stored in the electronic con­
trol unit .
Child restraints and Advanced Airbags
Regardless of the child restraint that you use,
make sure that it has been certified to meet Safe -
ty Standards and has been certified by its
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Wheels
Rim
means a metal support for a tire
or a tire and tube assembly upon
which the t ire beads are seated .
Rim diameter
means nominal diameter of the
bead seat . If you change your
wh eel size, you will have to p ur­
chase new tires to match the new
rim d iameter .
Rim size designation
means rim diameter and w idth.
Rim width
means nomina l distance between
r im flanges .
Sidewall
means that portion of a t ire be­
twee n 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 ti me. The ratings
range from 93 mph (150 km/h)
to 186 mph (298 km/h)
¢ table
on page 342 .
You may not find
this information on all tires be­
cause it is not required by law.
The speed rating letter code,
wh ere applicable, is molded on
the tire sidewall and ind icates the
3 46
maximum permissible road
speeds
¢ A in Winter tires on
page 357 .
Tire pressure monitoring
system
means a system that detects
when one or mo re of a vehicle 's
tires a re underinflated and illumi ­
nates a low tire pressure war ning
telltale .
Tread
means that portion of a tire tha t
comes into contact wi th the road.
Tread separation
means pulling away of the tread
from the tire carcass .
Treadwear indicators (TWI)
means the projections wi thin the
pr inc ipal grooves designed to g ive
a visua l indication of the degrees
of wear of the t read . See
¢ page 350, Treadwear indicator
for mo re information on meas ur­
ing tire wear.
Uniform Tire Quality Grading
is a tire informa tion system devel ­
oped by the Unite d States Nation ­
a l Highway Traffic Safety Admin­
is tration (NHTSA) that is designed
to help buyers make re lat ive
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