2009 AUDI Q7 tire size

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Uniform tire quality grading
• Tread wear
• Traction AA A B C
• Temperature A B C
Quality grades can be found where applicable on the tire side wall
between tread shoulder and maximum section width=>
page 359,
fig. 295.
For example: Tread wear 200, Traction AA, Temperature A.
All passenger car tires must conform to Federal Safety Require ­
ments 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 specified
government test course .
For example, a tire graded 150 would wear one and
one half (1 1/2)
times as well on the government course as a tire graded 100.
The relative performance of tires depends upon the actual condi­
tions of their use, however, and may depart significantly from the
norm due to variations in driving habits, service practices and differ­
ences in road characteristics and climate.
Traction
The traction grades, from highest to lowest, are AA, A, B and C.
Those grades represent the tire's ability to stop on wet pavement as measured under controlled conditions on specified government
test surfaces of asphalt and concrete. A tire marked C may have
poor traction 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 conditions on a specified
indoor laboratory test wheel. Sustained high temperature can cause the material 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 performance which all passenger car tires must meet under the Federal Motor Vehicle
Safety Standard No. 109. Grades Band A represent higher levels of
performance on the laboratory test wheel than the minimum
required by law .
& 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.
& WARNING
The temperature grade for this tire is established for a tire that is properly inflated and not overloaded. Excessive speed, underinfla­
tion, or excessive loading, 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" tires, 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 .
Your vehicle is equipped with all -wheel drive, this will improve trac­
tion during winter driving, even with the standard tires. However,
we strongly recommend that you always equip all four wheels on .,_
Vehicle care I t •

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your vehicle with correctly fitted winter tires or a ll- season tires,
w hen winter ro ad condit ions are e xpected. T his also i mproves the
vehic le 's brak ing performance and reduces stopp ing distances.
Summer tires provide less grip on ice and snow .
Winter tires (s now ti res) mus t always be fitted on a ll four whe els .
Compatible tire pressure monitoring sensors must be installed on
all f our winte r tires fo r th e tir e pres su re m onitori ng sy stem to f unc ­
tion properly=>
page 367 .
Ask your authorize d Audi dealer or qualified worksho p for permitted
winter tire sizes. Use on ly rad ial winter t ires .
Winter tires lose their effectiveness when the tread is worn down to a depth of 0 .157 inc h (4 m m).
O nl y dr ive w ith w in ter tires unde r winter co nditio ns. Su mmer tires
handle bette r when there is no snow o r ice on the roads and the
t emp eratur e i s abo ve 45 °F (7 °C) .
If you have a f la t t ire, see not es on spar e wh eel=> page 359 .
Please a lways reme mber that winte r tir e s may have a l owe r speed
rat ing t han th e tire s orig inal ly in sta lled o n your v ehic le at t he ti me
it wa s manufactured . Please see=>
page 3 60, "S pee d rating (letter
co de) " f or a list ing o f the spe ed rating letter c odes and t he
maximum speed at which the ti res can be driven .
T h e sp eed rating lette r co de( ::::>
page 350) is on t he sid e w all of the
tire=>
page 3 59.
& WARNING
Winter tires have maximum speed limits that may be lower than
your vehicle's maximum speed . Always know the maximum speed
before driving off . Never dr ive faster than the speed permitted for
your specific winter tires. This will cause damage to the tires
leading to an accident and serious personal injury to you and your
passengers .
& WARNING
Driving faster than the maximum speed for whi ch the winter tires
on your vehicle were designed can cause tire failure including a
blowout and sudden deflation , loss of control , crashes and serious
personal injuries. Have worn or damaged tires replaced immedi­
ately.
• Winter tires have maximum speed rating that may be lower
than your vehicle's maximum speed .
• Never drive faster than the speed for which the winter or other
tires installed on your vehicle are rated.
& WARNING
Always adjust your driving to the road and traffic conditions .
Never let the good acceleration of the winter tires and all -wheel
dr ive tempt you into taking extra risks . Always remember :
• When braking , an all -wheel drive vehicle handle s in the same
way as a front drive vehicle .
• Drive carefully and reduce your speed on icy and slippery roads,
even winter tires cannot help under black ice conditions .
~ For the sake of the environment
Use summer tires when weather conditions permit . They are
q uieter, d o not wear as qu ick ly and re duce fue l c on sumption .•
Snow chains
S now c hains may be fitted on ly to t he rear w hee ls, and only to
certain tire sizes. Ask your autho rized A udi dea ler on which tire
s izes sn ow cha ins ca n be used .
T he snow chains must hav e low -prof ile links and must not be thicker
th an 0 .53 in ch (13 .5 mm), inc lu d in g the loc k. .,_

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Remove wheel center covers and trim discs before putting snow
chains on you r veh icle =>
(D. For sa fety reasons c ove r cap s m ust
then be fitted over the wheel bo lts . These are avai lable from autho ­
r ized Aud i deale rs.
& WARNING
Using the wrong snow chains for your vehicle or in stalling them
incorrectly can increase the risk of loss of control leading to
serious personal injury.
• Snow ch ains are available in different sizes . Always make sure
to follow the instructions provided by the snow chain manufac ­
turer .
• When driving with snow chains never drive faster than the
speed permitted for your specific snow chains .
• Always observe local regulations .
0 Note
• Remove sn ow chai ns b efore d rivin g on roads not cove red w ith
snow to avoid damaging tires and wearing the snow chains down
u n n ecessa r i ly.
• Snow chains , which come into d irect contact with t he whee l rim,
ca n scratc h or da mage it. T herefore, ma ke sur e tha t th e snow chains
are suitably covered. Check the position of the snow chains after
dr ivin g a few yards and co rrect if necessa ry . Fo llo w t he instructio ns
from the snow cha in manufacturer when doing so.
• If th e Adapt ive A ir Sus pens io n* shou ld malfunction, do no t
mount or use snow chains because the vehic le wi ll be extremely
lo w. I f yo u do dr ive w ith snow c hai ns o n wh ile t he ve hicle i s a t thi s
level, the snow cha ins might severely damage the wheelhouse and
ot her parts o f the vehicle .
[ i ] Tips
W here snow cha ins are man datory o n certa in roads, t his no rmall y
a lso a pplie s to vehic les with A ll Wheel Drive .•
Wheel bolts
W heel bolt s must alw ays b e tightened t o th e c orr ect
tor que.
The de sign of wheel bo lts is matc hed to the fac to ry instal led rims. If
different rims are fitted, the correct wheel bo lts with the right length
and correctly shaped bolt heads must be used . This ensures that
w hee ls are fitted securely and that t he b rake sys tem functions
co rrectly.
I n certain circums ta nces, you may not use w heel bo lts fr om a
different vehicle -even if it is the same model=>
page 403.
& WARNING
Improperly tightened or mainta ined wheel bolts can become loose
causing loss of control , a colli sion and serious per sonal injury .
• Always keep the wheel bolts and the threads in the wheel hubs
clean so the wheel bolts can turn easily and be properly tightened.
• Never grease or oil the wheel bolts and the threads in the wheel
hubs. They can become loose while d riving if greased or oiled ,
even if tightened to the specified torque.
• Only use wheel bolts that belong to the rim being installed .
• Never use different wheels bolts on your vehicle.
• Always maintain the correct t ightening torque for the wheel
bolts to reduce the risk of a wheel lo ss.
If the tightening torque of
the wheel bolts is too low, they can loosen and come out when the
vehicle is moving . If the tightening torque is too high, the wheel
bolts and th reads can be damaged and the wheel can become
loose .
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Vehicle care I t •

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0 Note
The specified torque for the wheel bolts is 120 ft lb (160 Nm) with a
tolerance of± 7,4 ft lb(± 10 Nm). Torque wheel bolts diagonally.
After changing a wheel, the torque must be checked as soon as
possible with a torque wrench -preferably by an authorized Audi
dealer or qualified workshop. •
Low aspect ratio tires
Your Audi is factory-equipped with low aspect ratio tires. These tires
have been thoroughly tested and been selected specifically for your
model for their superb performance, road feel and handling under
a variety of driving conditions . 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 sidewall height in relation to its tread width expressed
in percentage. Conventional 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 353, "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
potholes, curbs, gullies or ridges on the road, particularly if the tire
is underinflated.
In order to minimize the occurrence of impact damage to the tires
of your vehicle, we recommend that you observe the following precautions: •
Always maintain recommended inflation pressures. Check your
tire pressure every 2,000 miles (3,000 km) and add air if necessary.
• Drive carefully on roads with potholes, deep gullies or ridges.
The impact from driving through 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 tires or have them
inspected by the nearest authorized Audi dealer. Replace a
damaged tire as soon as possible.
• Inspect your tires every 2,000 miles (3,000 km) for damage and
wear. Damage is not always easy to see. Damage can lead to loss of
air and underinflation, which could eventually cause tire failure. If
you believe that a tire may have been damaged, replace the tire as
soon as possible.
• Th ese tires may wear more quickly than others.
• Please also remember 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 originally installed on your vehicle are
intended for maximum dry and wet road performance and handling.
They are not suitable for cold, snowy or icy weather conditions. If
you drive under those circumstances, you should equip your vehicle
with all -season or winter tires, which offer better traction under
those conditions. We suggest you use the recommended snow or all -season tires specified for your vehicle, or their equivalent.
Refer to~
page 363for more detailed information regarding winter
tires. •