2015 AUDI Q7 inflation pressure

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.

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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 275
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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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.
...

278 Tires a nd whee ls
Vehicle ma ximum load on
the tire
means that load on an individu­
al tire that is determ ined by
distr ibuting to each axle its
share of the maximum loaded
vehicle weight and div iding by
two.
Vehicle normal load on the
tire
means that load on an in div id u­
al t ire that is determ ined by d
istribut ing to each axle its
share of the curb weight, acces ­
sory weight, and normal occ u­
pant weigh t (distributed in ac­
cordance with table below
¢ page 2 78) and dividing by
two .
Occupant loading and distribution for vehicle normal load for
v arious designated seating capac ities
Designated seating Vehicle normal load, Occupant distribu-
capacity , number of number of occupants tion in a normally
occupants loaded vehicle
5/6*/7* 3 2 in front, 1 in sec -
ond seat
Cold tire inflation pressure
Tire pressure affects the overall handling, performance and safety
of a vehicle.
F ig. 25 0 Tire pressure label: located
on driver's side 8 -pillar
~----------~"'
~--=-==--=~1::.-=--=-•=:- :-,_. SIA COU>lR"f"fU;Sl,R
MW OWE lSlllHS P'RES5l0H OES f'Nall A, FIIICJD
:"" -ICPA. • PSI
.::. -KPA.. . PSI
°'~ -KPA. -PSI
Fig. 251 Tire pressure label

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.
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Maintaining proper tire pres-...J
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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¢&.

282 Tires and wheels
all of the occupants and lug­
gage or other cargo that the ve­
hicle can carry. For the location
of the tire pressure label
¢fig. 250.
A WARNING
Overloading a vehicle can
cause loss of vehicle control,
a crash or other accident, se­
rious personal injury, and
even death.
-Carrying more weight than your vehicle was designed
to carry will prevent the ve­
hicle from handling properly
and increase the risk of a loss of vehicle control.
-The brakes on a vehicle that has been overloaded may
not be able to stop the vehi­
cle within a safe distance.
-Tires on a vehicle that has
been overloaded can fail
suddenly causing loss of
control and a crash.
-Always make sure that the
total load being transported
- including the weight of a
trailer hitch and the tongue
weight of a loaded trailer -
does not make the vehicle heavier than the vehicle's Gross Vehicle Weight Rat­
ing.
A WARNING -
-Incorrect tire pressures
and/or underinflation can
lead to a ser ious or fatal ac­
cident .
-Incorrect tire pressures and/or underinflation cause increased tire wear and can
affect the handling of the
vehicle.
-Incorrect tire pressures and/or underinflation can
also lead to sudden tire fail­
ure, including a blowout
and sudden deflation, caus­ ing loss of vehicle control.
Checking tire pressure
The correct tire pressure for the
tires originally installed on
your vehicle is listed on the tire
pressure label located on driv­
er's side 8-pillar.
The recommended tire pres­
sures are on the tire pressure
label and in the table
c;, page 2 78, Cold tire inflation
pressure.This
means that the
pressure must be checked and
adjusted when the tire has not .,.

Tires and wheels 283
been driven for more than a It is usually not possible to see •
couple of miles (kilometers) at whether the radial tires used • '
low speeds during the previous today are underinflated just by
three hours . Air in the tires ex- looking at them.
pands when the tire heats up as Therefore, be sure to check tire
a result of internal friction as it pressures at least once a month
flexes in use. The tire pressure and always before going on a
is higher when the tire has long trip. Make sure to take the
warmed up than when it is number of people and the
"cold." amount of luggage into ac-
It is the inflation pressure in a count when adjusting tire pres-
"cold" tire that counts. There- sure for a trip - even one that
fore, you should never let air you would not consider to be out of a warm tire to match "long. " See ¢
page 286 , Tires
"Cold tire inflation pressure" and vehicle load limits for more
recommendations ¢
page 2 78. important information.
The tires would then be under- Always use an accurate tire
inflated and could fail sudden- pressure gauge when checking
ly. and adjusting inflation pres-
The tire pressure label on your sures. Check all of the tires and
Audi lists the recommended be sure not to forget the spare cold tire inflation pressures at tire . If the pressure in any tire is
maximum capacity for the new, too high when the tire is "cold,"
original equipment tires that let air out of the tire slowly
were on your vehicle at the time with the edge of the tire gauge it was manufactured. For the and keep checking the pressure
location of the label until you reach the pressure
¢
page 278, fig. 250. that is correct for the load (pas-
Most tires lose air naturally sengers and luggage) and kind
over time. They can also lose of driving you plan to do
.
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