AUDI S6 2011 Owners Manual

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Occupant loading and distribution for vehicle normal load for various designated seat ing capacities
Designated seating capacity, num- Vehicle normal load, number of Occupant distribution in a nor­
mally loaded vehicle
ber
of occupants occupants
5 3 2 in front, 1 in back seat
Co ld tire inf lation pressure
Tire pr essur e affects the overall handling, performance and safety of a vehicle .
Fig. 216 Tire pressure
label : lo cated o n
dr iver 's sid e B·pillar
Tire pressure generally refers to t he amo unt of a ir i n a tire tha t it
needs it to do its job and safe ly carry the comb ined load of t he entire
vehicle and its contents . Tire p ressure is measured in kilopasca ls
(kPa), the inte rnationa l measur ing unit and in poun ds per squar e in ch
(PSI). Tire press ure is based in part on the ve hicle 's design and load
limit -the greatest a mount of weight that the vehi cle can c arry safe ly
and the tire s ize. The proper tire pressure is frequently refer red to as
the "re commen ded cold t ire inflation p ressure. " Air in t he tires
expands when the tire heats up because of internal friction when it
flexes in use. T he tire press ure is hig her w hen the tir e h as warme d up
than whe n it is "cold." It is the inflation pressure in a "cold" tire that
c o unts. The refo re, you sho uld never let air o ut of a warm t ire to
match "cold ti re inflation pressure " recommendations . The t ires
wou ld then be under in flated and could fail s uddenly.
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SUOWN'EA'S MANUAl F AO:DrTIONAL
INFORMATION
VOIR U MANUEL DU PROJl'RIETAIRE
POUR PLUS OE
RENS£1Gf\1£MENTS Fig . 217 Tire pre ssur e
label
Ma intain ing prope r tire pressure is one o f the most importa nt things
you can do to he lp avoid sudde n tir e fa il u re . Under inflated tires are a
majo r ca use of sudden tire fa ilure . Keeping t ires at the rig ht pressure
is a lso important for safe and responsive vehicl e ha nd ling , traction,
braki ng an d load ca rryi ng.
Tire pressures are particularly impo rtant
when the vehicle is being driven at higher speed s, and then espe·
cially when heav ily loaded even within the permissible load ·
carrying capacities approved for your vehicle .
The recommended tire pressures for your Audi depend on the kind of
t ires on your vehicle and the num be r of passengers and/or amou nt o f
luggage you will be tra nspo rt ing .
The t ire pressure labe l is located on t he dr iver's side B-pilla r. The tire
pressure labe l lists th e recommended cold tire inflat ion p ress ures for
the vehicle at its maximum capacity weight and t ires t hat were on
•
your vehicle at the time it was manu fact ured. _,,,
Vehicle OP-eration Vehicle care Do-it-yourselt service iTechnical data

-~_T_ i_ re _ s_ a_n _ d_ w_ h _e_ e_ ls _________________________________________________ _
If you wish to improve comfort when operating the vehicle at
normal load (up to 3 o ccupants ), you can adjust tire pre ssures to
those specified for normal vehicle load . Before operating the
vehicle at maximum load, you must inc rease the tire pressures to
those specified for maximum vehicle load
=> & .
Bear in mind that the tire press ure monitoring system* can on ly
m oni tor the tire pressu res you have sto red . The system does no t
recogn ize the load condit ion of your vehicle.
T he effectiveness of the tire pressure monitoring system * w ill be
impaired if you store norma l load p ressu res b ut the n operate th e
vehicle at its maxim um loa d=> & .
Tire designation
See the illustration=> fig. 216 for the locat ion of the labe l on dr iver's
side B-p illar (colo r of the actu al labe l and ex act loc ation o n the
veh icle will vary slight ly) .
N ote that the following tab le is accurate at the time of going to press
and i s su bje ct to change. I n the even t of discrepancie s, t he tire pres­
sure label is located on the driver's side B-pillar always takes prece­
de nce.
The table below lists the recommended co ld tire inf lation pressures
fo r the Audi mode l covered by your Owner 's Literat ure at the vehicle's
capacity weight and t he tire sizes installed on the respective mode ls
as o rigina l equipment, or as a factory option.
Tire pressure front Tire pressure rear
Engine
(displace­
ment in liter) normal load
normal load
6-cylinder
3.0
6-cylinder
3 .2
245 /45 Rl 7 99H XL All Season
245 /40 R18 97H XL All Season
245/40 R18 97Y XL High Performance
255 /35 R19 96Y XL High Performance
245/ 45 Rl 7 99 H XL All Season
245 /40 R18 97H XL All Season
245 /40 R18 97Y XL High Performance
255 /35 R19 96Y XL High Performance
condition (up
to 3 occu- pants)
PSI
35
38
3 5 24 0
39 270
33 230
36
33
39
full load
condition
PSI kPA
38 260
41 280
3 5 260
44 300
36 250
39 270
36 250
44 300
condition (up
full load
to 3 occu- condition
pants)
PSI kPA kPA
32 220 270
35 240 42
290
3 2 220 38 260
33 230 45 310
30 210 36 250
33 230 39 270
30 210 36 250
33 230 45
310

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Engine Tire designation Tire pressure front II Tire pressure rear
(displace- normal load normal load
ment
in
liter) condition (up full load condition (up full load
to 3 occu-condition to 3 occu- condition
pants) pants)
PSI II kPA PSI II kPA II PSI ll kPA PSI II kPA
a-cylinder 245/45 Rl 7 99H X L All Season 36 250 39 270 33 230 39 270
4
.2
245/40 R18 97H XL All Season 39 270 42 29 0 35 2 40 42 290
245 /40 R18 97Y XL High Performance 36 250
39 270
33 230
39 270
255
/35 R19 96Y XL High Performance 39 4 4 300 33 230 45 310
XL = reinf orced or extr a load t ire. It m ay a lso ap pear a s xl, EXTRA LOAD , or RF on the tire sidewa ll.
The correct tir e press ure for th e
spare wh eel is l ocat ed on a labe l on
the driver 's s ide B-pillar.
B eca u se technical c hanges may be ma de to vehicle e quipment dur ing
the model year, always compare the tire s ize des ignation on the tire
pressu re la b el on yo ur vehicle with the t ires on your veh icle. Make
sure that the tire size in forma tion on the vehicle labe l is the same as
the s ize of the t ires on the vehicle. This is especially important i f the
vehicle belongs to someone else or you bought the vehicle with
different r ims/tires or you bought the vehicle as a previously owned
vehicle. that the vehicle can carry.
For the loc atio n of t he ti re p ressure label
~ page 299, fig. 216 .
_& WARNING
Overloading a vehicle can cause loss of vehicle control , a cra sh or
other accident, serious personal injury, and even death .
• Carrying more weight than your vehicle wa s de signed to carr y
will prevent the veh icle from handling properly and increase the
risk of a los s of vehicle control.
• The brakes on a vehicle that has been overloaded may not be
able to stop the vehicle within a safe di stan ce.
• Tires on a vehicle that has been overloaded can fail suddenly
c ausing lo ss 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
I
I
Remember, your safety and that of your passengers also depends on
m aki ng sure th at lo ad lim its are no t ex ceeded. Vehicle lo ad includes
everybody and everything in and on the veh icle. These load limits are
t echnically re fer red to as t he ve hicle's G ross Vehicle Weig ht Ra ting
("GVWR") . The Gross Axle Weight Rat ing ("GA WR") is the max imum
load that can be applied at each of the veh icle's two ax les. The Gross
Vehicle Weight Rat ing and the G ross Ax le We ight Ra ting are listed on
the safety comp liance sticke r label located on the driver's side B­
pillar. The tire p re ssur e label on your Audi lists the maxim um
combined weight of a ll of th e occ upants and luggage or other cargo
vehicle 's Gros s Vehicle Weight Rating. ._
Safety first Vehicle care Technical data

-~_T_ i_ re _ s_ a_n _ d_ w_ h _e_ e_ls _________________________________________________ _
in. WARNING
• Incorrect tire pressures and /or underinflation can lead to a
s eriou s or fatal a ccident .
• Incor rect tire p ressu res and /or underinflation cause increased
tire wear and can affect the handling of the vehicle .
• Incorrect tire pressu res and /or underinflation can also lead to
s udden tire failur e, including a blowout and sudden deflation,
caus ing loss of vehicle cont rol. •
Checking tire pressure
The correct tire pressure for the tires ori ginally installed
on your vehicle is listed on the tire pressure la bel located
on driv er's side 8-pillar.
Th e recommended tire pressures a re on the tire press ure labe l and in
t he table~ page 299, "Cold tire infla tion pressure" . This means that
the pressure m ust be checked an d adju sted when the tire has not
bee n dr iven for more than a co uple of miles (kilometers) at low
speeds dur ing the previous three hours. Air in the tires expands w hen
the tire heats up as a resul t of inte rna l fr iction as it flexes in use. The
tire press ure is higher when the t ire has warmed up than when it is
"cold."
It is the inflation press ure i n a "cold" t ire that counts . Therefore, you
should never let air out of a warm tire to match "Co ld tire inflat ion
pressure" recommendat ions~
page 299 . The t ires would t hen be
underinflated and co uld fail sudden ly .
T he tire p ress ure label on your Audi lists the recommended co ld tire
inflation pressures for the new, or iginal equipment t ires that were on
your vehicle at t he time i t was man ufa cture d. For the location of t he
label~
page 299 , fig. 216.
Most tires lose a ir nat urally over time. They can a lso lose some a ir if
you d rive over a pot hole or hi t a curb while pa rking .
It is usua lly not possible to see whether the rad
ia l tires used today are underinflated
jus t by loo king at th em.
T herefore, be sure to check t ire pressures a t least once a month and
always before go ing on a long trip. Make sure to take the number of
peop le and the amoun t of lugg age i nto a ccount whe n ad justi ng tire
pressure for a trip -even one that you would not consider to be
" lo ng." See ~
page 303, "Ti res and vehicle lo ad lim its" fo r mo re
important informat ion.
Always use an accurate t ire pressure ga uge when check ing and
ad justing i nflat io n pressures . Check all of the tires and be sure not to
forget the s pare tire . If the press ure in any ti re is too hig h when the
t ire is "co ld," let ai r out of t he tire slowly with t he edge of the ti re
gauge and keep checki ng the press ure unt il yo u reach the press ure
that is co rrect for the load (p assenge rs a nd luggage) a nd kind of
driving yo u plan to do.
If the press ure in any t ire is too low , no te the difference between t he
pressure in the cold tire and the pressure you need and add the a ir
t ha t you need to reac h the co rrect pressure fo r the vehi cle load
(passengers a nd luggage) fo r the tires o n yo ur vehicle as listed on the
on your vehicle and in this man ual and the k ind of driving yo u plan to
do .
Never exceed the ma ximum inflation pressure listed on the tire
s idewall for any reason .
Remember that the vehicle manufacturer, not the t ire manufacturer,
determines the cor rec t tire p ress ure for the tires on your ve hicle.
It is important to chec k the tire pressu re whe n the t ires a re co ld.
• Read the required t ire pressure from the t ire pressure label. The
ti re press ure la bel is located on t he dr iver's s ide 8 -pilla r.
• Turn t he va lve stem cap counte r-clockw ise to remove it from th e
t ire v alve .
• Place the air press ure gauge on the valve.
• Th e tire press ures s houl d only be ch ecked and adjus ted whe n the
tires are cold. The slightly raised pressures of warm ti res must not be
re du ced.
~

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• Adjust the tire press ure to the load you are ca rry ing .
• Reins tall the valve s te m ca p on the v alve .
When should I check the tire pressure?
The cor rect tire p ress ure is especially importa nt a t hi gh s peeds . The
pressu re s ho ul d therefore be c hecked at least once a month and
always befor e sta rt ing a jou rney . Do not fo rget to ch eck the tire pr es­
sure for the spare wheel=>
page 319.
When should I adjust the tire pressures?
Adjust t he tire pressure to the loa d you are ca rry ing . After chan ging a
w hee l or replac ing w heels yo u hav e to adjust the t ire press ures on all
w heels. I n add it io n, you m ust then store th e new t ire pressures in the
t ire press ure moni toring system *=>
page 31 6.
& WARNING
Incorrect tire pressures and /or underinflation can lead sudden tire
failure , loss of control , collision , serious personal injury or even
death .
• When the warning symbol appears in the instrument
cluster, stop and inspect the tires. • Incorrect tire pressure and/or underinflation can cause
increased tire
wear and can affect the handling of the vehicle and
stopping ability.
• Incorrect tire pressures and /or underinflation can also lead to
sudden tire failure , including a blowout and sudden deflation ,
causing loss of vehicle control.
• The driver is responsible for the correct tire pressures for all
tires on the vehicle. The applicable pressure values are located on
a sticker on the driver 's side 8-pillar.
• Only when all tires on the vehicle are filled to the correct pres­
sure, the tire pressure monitoring system* can work correctly .
• The use of incorrect tire pressure values can lead to accidents or
other damage . Therefore it is e ssential that the driver observe the
Safety first
& WARNING (co ntinued )
specified tire pressure values for the tires and the correct pres­
sures for the function of the tire pres sure monitoring system*.
• Always inflate tires to the recommended and correct tire pres­
sure before driving off.
• Driving with underinflated tires bend more , letting them get
too hot re sulting in tread separation, sudden tire failure and loss
of control.
• Excessive speed and /overloading can cause heat build-up,
sudden tire failure and loss of control.
• If the tire pressure is too low or too high, the tires will wear
prematurely and the vehicle will not handle well.
• If the tire is not flat and you do not have to change a wheel
immediately, drive at reduced speed to the nearest service station
to check the tire pressure and add air as required .
0 Note
Driv ing witho ut valve stem caps can cause damage to the t ir e valves.
T o preven t this, a lways make sure th at fa ct o ry insta lled va lve stem
caps on all wheels are s ecure ly m ou nted on t he v alve .
<£> For the sake of the environment
Under infla ted ti res will also increase t he fue l cons umption .•
Tires and vehicle load limits
Th ere a re limits to the amo unt of load or weight that a ny vehicle and
any tire can ca rry . A veh icle t hat is overloaded w ill not handle well and
is mo re diffic ult to s top . Ove rloading can no t only lead to loss of
vehicle contro l, but can also damage important parts o f the ve hicle
a nd can le ad t o sud de n tir e fa ilure, incl uding a blowout and su dden
deflation t hat can cause the vehicle to crash . .,_
Vehicle care Technical data

lffllL-_T.:..:..: ir:....:e~ s=---= a~ n:..:..: d:......: w..:....:.. h:....:e~ e= ls=--------------------------------------------------
Yo ur sa fety and that of your passengers also depends o n mak ing s ure
t h at loa d limits are no t ex ceede d. Vehicle lo ad incl udes eve rybody
and everyth ing in and on the vehicle. These load limits are tech nica lly
referred to as the ve hicle 's
Gross Vehicle Weight Rating ("G VW R").
T he "G VWR" includes the we igh t of the b asic ve hicl e, all fa ctory
installe d accesso ries, a fu ll tank of fue l, o il, coo lant and other fluids
p lu s m aximu m lo ad. Th e maxi mum lo ad include s th e num ber of
passengers that the vehicle is intended to carry ("seating capacity")
w ith a n assu med we ight of 150 l bs (6 8 kg) for e ach p assenger at a
designated seating position and the tota l weight of any luggage in
t he vehicle . If you tow a trai le r, t he weight o f the t railer hitch and t he
tongue we ig ht of the loaded trailer must be included as pa rt of the
veh icle load .
T he
Gross Axle Weight Rating ("GAWR") is the m aximum load tha t
can be applied at each of the vehicle's two ax les.
Th e Gross Vehi cle We ight Ratin g a nd the Gross Axle Weigh t Ra ting
are listed o n the safety compliance sticker label located on the
dr ive r's side B-pillar. You r A udi has 5 sea ting positions, 2 in the fron t
and 3 in the rear fo r tota l seati ng ca pac ity of 5 . Eac h seat ing position
has a safety belt ~
page 18 7, "Safety belts".
T he fa ct t hat t here is an upper lim it to your ve hicle's G ross Veh icle
We ight Rating means that t he total weight of whatever is being
c arried in t he ve hicle (includi ng the wei ght of a tra ile r hit ch an d the
tongue weig ht of the loaded tra iler) is limited. The more passengers
i n th e ve hicl e or p assenge rs who are heavier th an the stan dard
we igh ts assumed mean that less we igh t can be ca rried as luggage.
The tire pressure label on yo ur A udi a lso lists the max imum combined
w eight of all of th e occ upants and luggag e or o ther cargo that th e
vehicle ca n car ry. Fo r the location o f the labe l~
page 299, fig . 216.
& WARNING
Overloading a vehicle can cause loss of vehicle control , a crash or
other accident, serious personal injury, and even death.
& WARNING (co ntinued )
• Carrying more weight than your vehicle was de signed to carry
will prevent the vehicle from handling properly and increase the risk of the loss of vehicle control.
• The brakes on a vehicle that has been overloaded may not be
able to stop the vehicle within a safe di stance.
• Tires on a vehicle that has been overloaded can fail suddenly,
including a blowout and sudden deflation, 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 Gros s Vehicle Weight Rating. •
Determining correct load limit
Use the example below to calculate the
total weight of the passengers and luggage or other things that you plan to transport so
that you can make sure that your vehicle
will not be overloaded. .-.

Steps for Determining Correct Load Limit
1.Locate the statement "THE COMBINED WEIGHT OF OCCUPANTS AND CARGO
SHOULD NEVER EXCEED XXX KG OR XXX LBS"on your vehicle's placard (tire infla­
tion pressure label) =>
page 299,
fig. 216.
2. Determine the combined weight of the driver and passengers that will be riding in your vehicle.
3. Subtract the combined weight of the driver and passengers from
"XXX" kilo­
grams or
"XXX" pounds shown on the
sticker =>
page 299, fig. 216.
4. The resulting figure equals the available amount of cargo and luggage load
capacity. For example, if the
"XXX"
amount equals 1400 lbs. and there will be five 150 lbs . passengers in your
vehicle, the amount of available cargo
and luggage load capacity is 650 lbs.
(1400-750 (5
X 150) = 650 lbs.)
Safety first
Tires and wheels -
5. Determine the combined weight of
luggage and cargo being loaded on the
vehicle. That weight may not safely exceed the available cargo and luggage
load capacity calculated in Step 4.
6. If your vehicle will be towing a trailer ,
load from your trailer will be transferred
to your vehicle. Consult this manual to
determine how this reduces the available cargo and luggage load capacity of your
vehicle.
- Check the tire sidewall(=>
page 307,
fig. 220) to determine the designated load rating for a specific tire . •
Vehicle care Technical data

___ T_ i_ r _e _s_ a_n_ d_ w_ h_ e_e_ l_ s _______________________________________________ _
Tire service Life
The servi ce life of tires depends on a lot of different
things including proper installation and balancing,
correct tir e pressure and driving style.
l 1.. ______ Jj
Tread Wear Indicator (TWI)
Fig. 2 18 Tire tread:
t rea d w ear in di cato rs
(TW I)
Fig . 21 9 R otati ng
tires f or m ore e ven
w ea r
The original t ires o n your veh icle have 1/16 inch ( 1.6 mm) h igh "wear
ind icators"~ fig. 218 running across the tread . Depending on the
ma ke, there w ill be six to eight of them even Ly placed around the ti re.
Marks on the t ire sidewall (for examp le "TWI " or other symbols) indi­
cate the positions of the tread wea r indicators . Worn t ires must be
replaced. Differe nt figu res may apply in other countries ~ & .
Tire pressure
Incorrect tire pressure causes premature wea r and can cause sudden
tire blow-o ut. Fo r th is reason, tire pressu re must be checked at least
once a mont h
~ page 302.
Driving style
Driving fast aro und curves, heavy acceleration and hard b raking
increase tire wear .
Rotating tires for more even wear
For all four tires o n your ve hicle to have the same se rvice life, we
recommend that the fron t and rear t ires are rot ated according to the
tire manufact urer's suggested tire rotat ion intervals . Please
remember the fo llow ing :
• Tir e ro tat ion inte rvals may d iffe r from the vehicle serv ice intervals
out lined in your Maintenance and Warranty Booklet .
• The longer one tire is used in one locat ion on the vehicle, the more
it wears at certain points; therefore, we recommend that you follow
the t ire manufacture r's sugges ted tire rotation interva ls .
• Vehicles with front-whee l drive experience more tread wea r on the
front wheels compa red to a ll-wheel dr ive (quattro ®).
• Please ro ta te tires as shown~ fig. 219 .
• Extra care must be taken when rotating direction -specific t ires
~ page 325 .
Wheel balancing
The wheels on new vehicles are balanced. However, var ious si tuatio ns
dur ing everyday driving can cause them to become unbalanced,
resu lting in v ibr ations yo u can us ua lly fee l throug h the stee rin g
w heel.
Unbalanced whee ls mus t be rebalanced to avoid excessive wea r on
steeri ng, suspension and tires . A wheel must also be rebalanced
when a new tire is installed.
~

________________________________________________ T_ i_ re _ s_ a_ n_d_ w_ h_ e_ e_l _s _ ....... JIII
Incorrect wheel alignment
In correct whee l al ignme nt can ca use excessive tir e wea r, impairing
th e sa fety o f the vehicl e. If t ires show excessive w ear, hav e the w heel
alignment checked by a n authorized A udi dea ler or qualifie d work­
shop.
All Wheel Drive
Vehicles wi th quattro® must always have tires of the same size ,
con st ruct ion an d tread type . For details see~
page 248.
& WARNING
Sudden tire failure can lead to los s of control, a cra sh and serious
personal injury!
• Never drive a vehicle when the tread on any tire is worn down
to the wear indicators.
• Worn tires are a safety hazard, they do not grip well on wet
roads and increase your risk of "hydroplaning" and loss of control.
• Always keep chemicals that can cause t ire damage, such as
grease , oil, gasoline and brake fluid away from tires.
• Tires age even if they are not being used and can fail suddenly,
especially at high speeds. Tires that are more than 6 years old can
only be used in an emergency and then with special care and at
lower speeds.
• Never mount used tires on your vehicle if you are not sure of
their "previous history. " Old used tires may have been damaged
even though the damage cannot be seen that can lead to sudden
tire failu re and loss of vehicle control. •
Vehicle OP-eration
New tires and replacing tires and whee ls
N ew t ires an d w hee ls have to be brok en in .
Fig. 220 Tire specificat ion codes on th e sidewall of a tire
No.
©
®
®
©
©
©
Description
Passenger car tire (where applicable)
Nom inal wid th of ti re in mil limeters
Ratio of hei9ht to width (aspect ratio)
Radial
jj Rim diameter code
L oa d index and speed rating
Vehicle care Do-it-yourselt service iTechnical data

-~_T_ i_ re _ s_ a_n _ d_ w_ h _e_ e_ ls _________________________________________________ _
(j)
®
®
@
@
U.S . DOT tire identification number
Audi Original tire
Sever snow conditions
Tire ply composition and materials used Ma ximum load rating
Treadwear, traction and temperature grades M axi mum pe rmissib le inflation 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 characteris­
tics of the vehicle and can make a major contribution to good road holding and safe handling when in good condition and properly
inflated
~ & .
We recommend that all work on tires and wheels be performed by an
authorized Audi dealer . They are familiar with recommended proce­
dures 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 about tech­
nical requirements for installing or changing tires and rims.
Replacing tires and wheels
Tires should be replaced at least in pairs and not individually (for
example both front tires or both rear tires together) .
Be sure to read and heed the information to the tire pressure moni­
toring system* ~
page 314.
Always buy replacement radial tires that have the same specifications
as the tires approved for your vehicle by Audi. Replacement tires must
always have the same load rating specification as the original equip ­
ment or approved optional tires listed in the table~
page 299.
Audi-approved specification tires are specially matched to your
vehicle and its load limits, and can contribute to the important road- holding, driving characteristics, and safety of the vehicle
. The table
(~ page 299) lists specifications of the tires approved for the Audi
models covered by your Owner's Literature.
The tire pressure label located on driver's side B-pillar (~
page 299,
fig. 217) lists the specifications of the original equipment tires
installed on your vehicle at the time it was manufactured.
Federal law requires tire manufacturers to place standardized infor­
mation on the sidewall of all tires~
page 307, fig. 220 . This infor­
mation identifies and describes the fundamental characteristics, the
quality grade of the tire and also provides a tire identification number
for safety standard certification and in case of a recall.
Tire specifications
Knowledge of tire specifications makes it easier to choose the correct
tires . Radial tires have the tire specifications marked on the sidewall,
for example:
P245 / 45 R 17 99 H XL
This contains the following information:
P Indicates the tire is for passenger cars (where applicable)
245 Nominal tire width in mm of the tire from sidewall edge to side-
wall edge. In general, the larger the number, the wider the tire
45 Height/width ratio in percent (aspect ratio)
R Tire construction : Radial
17 Rim diameter code (in inches)
99 Load rating code
H Speed rating letter code
XL (or "xl", "EXTRA LOAD", or "RF") indicates that the tire is a"Rein­
forced" or an "Extra Load" tire
M+S (or "M/S") Indicates that the tire has some mud and snow capa­
bility
The tires could also have the information of direction of rotation
~page 295.