2015 AUDI Q7 tire size

224 Intellig ent technol ogy
roads . If the systems begin acting to sta­
bilize your vehicle, you should immedi­
ately change your speed to match the
road and traff ic conditions. Do not let
the inc reased safety prov ided by these
systems tempt you to take r isks. Doing
so w ill increase the risk of a loss of vehi­
cl e con tro l, coll is ion and serio us personal
injuries.
- Always adapt you r speed to road, traff ic
and weather condit ions. The risk of los­
ing contro l of the veh icle increases when
driv ing too fast, especia lly t hrough
c u rves and on slippery or wet roads, and
when driving too close to vehicles up
ahead. The ESC and its integrated sys­
tems cannot always prevent collisions -
there is still a r isk of accidents!
- Always acce lerate with special care on
even, smooth surfaces such as those that
Switching on/off
are wet or covered with ice and snow.
The drive wheels can spin even w ith
these assistance systems that cannot al­
ways help to reduce the risk of loss of ve­
h icle control.
(D Tips
- ABS and ASR only work correctly when
all four wheels are equipped with identi­
cal tires. D ifferent tire sizes can lead to a
reduction in engine power.
- You may hear noises when the systems
descr ibed are working.
- If the ind icator light
DJ or fil (USA
mode ls)/ ti] (Canada models) appears,
there may be a malfunction
<:;> page 16,
<:;>page 18.
ESC turns on automatically when you start the engine .
,.-------------.,
------------------
Fig. 231 Upper cente r console: f'J OFF button
The follow ing s ituations are exceptions where
it may be useful to switch on offroad mode to
a llow the whee ls to spin:
Offroad mode on
- Rocking the vehicle to free it when it is st uck
- Dr iving in deep snow or on loose ground
- Dr iving with snow chains
- Dr iving on rough terrain when much of the
car's weight is lifted off the whee ls (axle ar­
ticulation)
- Dr iving downh ill wh ile brak ing on loose
ground
Offroad mode off
Beha vior
The ESC and ASR stabilization funct ions The fu ll stab ilization funct ion of the ESC
are limited <:;>,&..
and ASR is availab le agai n.
Operat ion Press the I~ O FFI button . Press the I~ OFFI button again.
Indi ca to r IJ tu rnson. II turns off.
li g ht s
D riv er m es- Stabil izat ion cont rol (ES C): O ffroad. S tabil ization contro l (ESC) : On
sa ges Warning! R estricted st ab ility

274 Tir es a nd whee ls
Bead Extra load tire
means the part of the tire that means a tire design to operate
is made of steel wires, wrapped at higher loads and at higher
or reinforced by p ly cords and inflation pressures than the
that is shaped to fit the rim . corresponding standard tire .
Bead separation Extra load tires may be identi-
fied as "XL", "xl", " EXTRA
means a breakdown of the bond LOAD", or "RF" on the sidewall.
between components in the
bead .
Gross A xle Weight Rating
(" GAWR ")
Cord
means the load-carrying capaci-
means the strands forming the ty of a single axle system,
p lies in the tire .
measured at the tire-ground in-
Cold tire inflation pressure terfaces.
means the tire pressure recom-
Gross Vehicle Weight Rating
mended by the vehicle manu-( "GVWR ")
facturer for a t ire of a designat-
means the maximum total
ed size that has not been driven loaded weight of the vehicle.
for more than a couple of miles
Groove
(kilometers) at low speeds in
the three hour period before means the space between two
the tire pressure is measured or adjacent tread ribs.
adjusted.
Load rating (code )
Curb weight
means the max imum load that
means the weight of a motor a tire
is rated to carry for a giv-
vehicle with standard equip -en inflation pressure
. You may
ment including the maximum not find th
is information on all
capacity of fuel, oil, and cool- tires because it is not required
ant, air condit ioning and addi- by law.
...
tional weight of optional equip-
ment.

276 Tires a nd whee ls
Recommended inflation Sidewall
pressure
means that portion of a tire be -
see
c:::> page 2 7 4, Cold tire infla-tween the tread and bead.
tion pressure.
Speed rating (letter code )
Reinforced tire
means the speed at which a tire
means a tire design to operate is designed to be driven for ex-
at higher loads and at higher tended periods of time. The rat-
inflation pressures than the ings range from 93 mph (150
corresponding standard tire .
km/h) to 186 mph (298 km/h)
Reinforced tires may be identi -
c:::> page 294. You may not find
fied as "XL", "xl", "EXTRA
this information on all tires be-
LOAD", or "RF" on the sidewall.
cause it is not required by law.
Rim The speed rating letter code,
means a metal support for a where applicable, is molded on
tire or a tire and tube assembly the tire sidewall and indicates
upon which the tire beads are the maximum permissible
road
seated . speeds
c:::> A in Winter tires on
Rim d
iameter
page 298.
means nominal diameter of the
T ir e pressure mon itoring
system
bead seat. If you change your means a system that detects
wheel size, you will have to pur-
chase new tires to match the when one or more of a vehicle's
new rim diameter . tires are underinflated and illu-
Rim
size de signation
m inates a low tire pressure
warning telltale.
means rim diameter and width.
Tread
R im width
means that portion of a tire
means nominal distance be- that comes into contact with
tween rim flanges. the road.
...

Tires and wheels 2 79
Tire pressure generally refers to tant things you can do to help •
the amount of air in a tire that avoid sudden tire failure. Un-• '
it needs it to do its job and derinflated tires are a major
safely carry the combined load cause of sudden tire failure. of the entire vehicle and its con- Keeping tires at the right pres-
tents. Tire pressure is measured sure is also important for safe
in kilopascals (kPa), the inter- and responsive vehicle han-
national measuring unit and in dling, traction, braking and
pounds per square inch (PSI). load carrying.
Tire pressures
Tire pressure is based in part on are particularly important
the vehicle's design and load when the vehicle is being driv-
limit - the greatest amount of en at higher speeds, and then
weight that the vehicle can car-especially when heavily loaded
ry safely and the tire size. The even within the permissible
proper tire pressure is frequent-load-carrying capacities ap-
ly referred to as the "recom-proved for your vehicle.
mended cold tire inflation pres-The recommended tire pres-
sure." Air in the tires expands sures for your Audi depend on
when the tire heats up because the kind of tires on your vehicle
of internal friction when it flex- and the number of passengers
es in use. The tire pressure is and/or amount of luggage you
higher when the tire has will be transporting.
warmed up than when it is The tire pressure label is locat-
"cold." It is the inflation pres-
ed on the driver's side B-pillar.
sure in a "cold" tire that counts.
Therefore, you should never let The tire pressure label lists the
recommended cold tire infla-
air out of a warm tire to match
"cold tire inflation pressure" tion pressures for the vehicle at
its maximum capacity weight
recommendations. The tires
would then be underinflated and tires that were on your ve-
and could fail suddenly. hicle at the time it was manu-
factured.
M N
0
Maintaining proper tire pres-...J
'SI: ,...., \!)
sure is one of the most impor-1.1'1 ,...., 1.1'1 ,....,

280 Tires and wheels
If you wish to improve comfort See the illustration ¢ fig. 250
when operating the vehicle at for the location of the label on
normal load (up to 3 occu-driver's side B-pillar (color of
pants), you can adjust tire the actual label and exact loca-
pressures to those specified tion on the vehicle will vary
for normal vehicle load. Before slightly).
operating the vehicle at maxi-Note that the following table is
mum load, you must increase accurate at the time of going to
the tire pressures to those press and is subject to change .
specified for maximum vehicle In the event of discrepancies,
load¢&. the tire pressure label located
Bear in mind that the tire pres- on the driver's side B-pillar al-
sure monitoring system can on- ways takes precedence.
ly monitor the tire pressures
The table below lists the rec-
you have stored . The system
ommended cold tire inflation
does not recognize the load
pressures for the Audi model
condition of your vehicle. covered by your Owner's Litera-
The effectiveness of the tire ture at the vehicle's capacity
pressure monitoring system weight and the tire sizes instal-
will be impaired if you store led on the respective models as
normal load pressures but then original equipment, or as a fac-
operate the vehicle at its maxi-tory option.
...
mum load¢&.

M N
0 ...J 'SI" ,...., \!) 1.1'1 ,...., 1.1'1 ,....,
Tires and wheels 281
Model/ Tire designation Tire pressure
Engine normal load condition full load condition
front rear front rear
PSI kPA PSI kPA PSI kPA PSI
kPA
255/55 R18 109H XL
All Season
35 240
35 240 44
300 49 340
265/50 Rl9 llOH XL
All Season
35 240
35 240 44
300 49 340
Q7:
3.0 liter 275/45 R20 110H XL
All Season
35 240
35 240
44 300 49 340
6-cylinder
275/4S R20 llOY XL
High Performance
35 240 35 240 44 300 49 340
295/35 R21 107V XL 36 250 35 240
44
300 49 340
High Performance
XL~ reinforced or extra load tire. It may also appear as xl, EXTRA LOAD, or RF on the tire side-
wa .
The correct tire pressure for the
spare wheel is located on a la­
bel on the driver's side B-pillar.
Because technical changes may
be made to vehicle equipment
during the model year, always
compare the tire size designa­
tion on the tire pressure label on your vehicle with the tires on
your vehicle. Make sure that the tire size information on the ve­
hicle label is the same as the
size of the tires on the vehicle.
This is especially important if
the vehicle belongs to someone
else or you bought the vehicle
with different rims/tires or you
bought the vehicle as a previ­
ously owned vehicle. Remember, your safety and
that of your passengers also de­ pends on making sure that load
limits are not exceeded. Vehicle
load includes everybody and ev­
erything in and on the vehicle.
These load limits are technical- ly referred to as the vehicle's
Gross Vehicle Weight Rating ("GVWR"). The Gross Axle
Weight Rating ("GAWR") is the maximum load that can be ap­
plied at each of the vehicle's
two axles. The Gross Vehicle
Weight Rating and the Gross
Axle Weight Rating are listed on the safety compliance stick-
er label located on the driver's
side B-pillar. The tire pressure label on your Audi lists the
maximum combined weight of ""
•
•
'

290 Tires and whee ls
Driving style - Extra care must be taken when
Driving fast around curves, rotating direction-specific
heavy acceleration and hard tires
¢
page 311.
braking increase tire wear. Wheel balancing
Rotating tires for more even
The wheels on new vehicles are
wear ba lanced. However, various sit-
For all four tires on your vehicle uations during everyday driving
to have the same service life, can cause them to become un-
we recommend that the front balanced, resulting in vibra-
and rear tires are rotated ac -tions you can usually feel
cording to the tire manufactur- through the steering wheel.
er's s uggested tire rotation in-
Unbalanced wheels must be re-
tervals . Please remember the
balanced to avoid excessive
following: wear on steering, suspension
-T ire rotation intervals may dif -and tires. A wheel must also be
fer from the vehicle service in· rebalanced when a new tire is
tervals outlined in your War -insta
lled .
ranty
& Maintenance booklet . Incorrect wheel alignment
-The longer one tire is used in
Incorrect wheel alignment can
one location on the vehic le,
cause excessive ti re wear, im-
the more it wears at certain
pairi ng the safety of the vehi-
points; t herefore, we recom-
cle . If t ires show excessive
mend that you fo llow the tire
wear, have the wheel alignment
manufacturer's suggested tire
checked by an authorized Audi
rotation interva ls.
dealer or qualified wo rkshop.
-Vehicles with front-wheel
dr ive experience more t read
All-wheel drive
wear on the front wheels com-
Vehicles with quattro must al -
pared to all-wheel drive (quat- ways have tires of the same
tro) .
size, construction and tread
-Please rotate tires as shown type. For details see
¢ fig. 253.
¢page 227. ...

296 Tires and wheels
sure of their "previous histo-
and sudden deflation and
ry." Old used tires may have loss of control.
been damaged even though -Temperature grades apply
the damage cannot be seen to tires that are properly in-
that can lead to sudden tire flated and not over or un-
failure and loss of vehicle
derinflated.
control. -For technical reasons it is
-All four wheels must be fit-
not always possible to use
ted with radial tires of the wheels from other vehicles -
same type, size (rolling cir- in some cases not even
cumference) and the same wheels from the same vehi-
tread pattern. Driving with cle model.
different tires reduces vehi- -If you install wheel trim
cle handling and can lead to
discs on the vehicle wheels,
a loss of control. make sure that the air flow
-If the spare tire is not the to the brakes is not blocked.
same as the tires that are Reduced airflow to the
mounted on the vehicle -for
brakes can them to over-
example with winter tires -
heat, increasing stopping
only use the spare tire for a distances and causing a col-
short period of time and lision.
drive with extra care. Refit -Run flat tires may only be
the normal road wheel as used on vehicles that were
soon as safely possible. equipped with them at the
-Never drive faster than the
factory. The vehicle must
maximum speed for which have a chassis designed for
the tires on your vehicle are run flat tires. Incorrect use rated because tires that are of run flat tires can lead to
driven faster than their rat-
vehicle damage or acci-
ed speed can fail suddenly. dents. Check with an au-
-Overloading tires cause heat thorized Audi dealer or tire build-up, sudden tire fail- specialist to see if your vehi-
ure, including a blowout cle can be equipped with
..