tires AUDI R8 SPYDER 2012 Owners Manual

Monitoring the Advanced Airbag
System .... .... .. .... ... .. .. .. . .
Knee airbags . ... ...... ... .. .. .. . .
Side airbags ............. .... .. . .
Child Safety ... ..... ... .. .. .. . .
120
124
127
130
Important things to know . . . . . . . . . . 130
C hi ld safety seats . . . . . . . . . . . . . . . . . 135
Instal ling a child safety seat . . . . . . . . 138
Addit io nal Information . . . . . . . . . . . . 141
Vehicle operation ....... .. .. . .
Intelligent technology .. .. ... .
Not ice about data recorded by veh icle
con trol modules . .... ... .. .. .. .. . .
E lect ron ic Stability Con trol ( ESC) .. . .
Rear spoiler ............. .. .. .. . .
Braking .... .. .. ... . .... ... .. .. . .
Powe r stee ring . .. ..... ... .. .. .. . .
Driving with your quattro ® ... .. .. . .
E nergy management ...... .. .. .. . .
Dry s ump lubr ication ...... .. .. .. . . 142
142
142
1
42
1 4 4
1 4 5
146
147
147
149
Driving and environment . . . . . 150
Break- in period . . . . . . . . . . . . . . . . . . . 150
Driving through water on roads . . . . . 150
Cata lytic converter . . . . . . . . . . . . . . . . 150
Sporty driving ............... .... . 151
Operation and maintenance . . . . . . . . 15 1
T railer towing . . . . . . . . . . . . . . . . . . . . 15 2
Vehicle care . . . . . . . . . . . . . . . . . . . 153
Cleaning and protection . . . . . . 153
Gene ral inf ormatio n . . . . . . . . . . . . . . 1 53
Ca re of exterior . . . . . . . . . . . . . . . . . . 153
Ca re of interior . . . . . . . . . . . . . . . . . . . 158
Fuel supply and filling your
fuel tank . . . . . . . . . . . . . . . . . . . . . . .
164
Gasoline . . . . . . . . . . . . . . . . . . . . . . . . 164
F ue l tank . . . . . . . . . . . . . . . . . . . . . . . . 165
Checking and filling . . . . . . . . . . . 169
Engine compartment lid . . . . . . . . . . . 169
Eng ine oil . . . . . . . . . . . . . . . . . . . . . . . 172
Eng ine cooling system..... .. .. .. .. 175
Brake fluid . ... .. ..... ... .. .. .. .. 178
Table of contents 3
Battery ... .. .... ... .. .. ..... ... .
Windshie ld washer container
Tires and wheels .... .... ... .. .
Tires ... .. .. .... ... .. .. ..... ... .
Tire pressure monitoring system 178
182
183
183
200
Do-it-yourself service . . . . . . . . . 203
What do I do now? . . . . . . . . . . . . 203
Tr unk escape handle . . . . . . . . . . . . . . 203
Breakdown k it . . . . . . . . . . . . . . . . . . . 203
Tire repair . .. .. .. ............... .
What should I be aware of when
h . t· 7 c
anging a rre. . .. .............. .
Jump-starting .. .. ... .. .. ... ..... .
E mergency towing wit h commercia l
tow tr uck . .... .. .. . ............ .
Fu se s and bulbs ... ........... .
Electr ica l fuses . .. ............... .
B ul bs ... .. .. .. .. .. .. .. .. .... ... . 203
206
209
212
213
2
13
214
Technical da ta . . . . . . . . . . . . . . . . . 215
General information . . . . . . . . . . 215
Explanation of techn ica l da ta . . . . . . . 215
Vehicle identification . . . . . . . . . . . . . . 215
Weights . . . . . . . . . . . . . . . . . . . . . . . . 215
Dimens ions.. .. ...... ............ 216
Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
R8 Spyder 4.2 quattro . . . . . . . . . . . . . 217
R8Spyder5.2quattro ............. 217
Dimens ions .. .... .... .... ... .... . 218
Capacities (approx .) . . . . . . . . . . . . . . . 218
Consumer Information . . . . . . . 219
Warranty coverages . . . . . . . . . . . . . . . 219
Operating your ve hicle outs ide the
U .S.A. or Canada . . . . . . . . . . . . . . . . . 219
Audi Se rv ice Repair Manuals and
Li te ratu re . . . . . . . . . . . . . . . . . . . . . . . 219
Maintenance ... .. .. . ... ...... ... . 219
Additional accessories, modifications and parts rep lacement . . . . . . . . . . . . 221
Inde x . . . . . . . . . . . . . . . . . . . . . . . . . . 223
•
•

20 Instruments and warning/indicator lights
[O] Gearbo x malfunct ion! You can continue
dri ving but functions are rest ricted
There is a serio us sys tem ma lf u nction:
- The prog ram shifts only i nto ce rtain gears.
- The eng ine may sta ll.
- It is not possib le to restart the eng ine if it
has been switched off.
- Contin uing to dr ive could result in s ubse­
quent damage.
0 Note
If R tronic has switc hed to emergency op­
erat ion mode, you s hou ld have the mal­
function corrected as soon as possible .
(J.) Tire pressure monitoring system
Applies to vehicles: with tire pressure monitoring system
Tire pressure that is too low must be correct ­
ed as soon as possible .
The warning/ind icator light
[I] i ll uminates fo r
a few seconds afte r the ignit ion is t urned on
as a funct io n check. If t he (I] warning light
co mes on, pressu re in at least one tire is too
low .
.,. Stop driv ing as soon as possible without e n­
dange ring yourse lf and other drivers on the
r oad.
• Inspect all tires.
• Correc t the t ire pressur e¢ page 189 .
Addit ional information about the
t ire pres ­
sure monitoring system
can be found
¢ page 201.
¢¢ Turn signals
The indicator light blinks when you use either
turn signal .
Whenever you use the left
R or the r ight II
turn signal , the ind icator light blinks. When
you use the emergency flasher, both indicator
lig hts flash .
If one of the tu rn s ignal light bu lbs burn out,
the t urn signa l wi ll blink tw ice as fast as n or­
mal. Additional
in formation on the turn s ignals
¢ page 51.
CRUISE/ (,)" Cruise control
The (lj;(i)~i~ (USA mode ls)/ . (Canada models)
warning/indicator light illuminates whe n the
cruise control is activated .

30 Driver in formation sy ste m
each other and that have somewhat different
purposes:
Spee d warn ing 1 lDl/lOl ( Canada models )
You can use speed warning 1 to set the maxi­
m um speed w hile you are driv ing. This sett ing
will remain in effe ct until you turn off the igni­
tion, assuming that you have not changed or reset the setting .
The speed warning symbo l
(alllDl (Canada
models) in the warning 1 display appea rs
when you exceed the maxim um speed. It goes
out when the speed falls be low the stored
maximum speed.
The speed wa rning symbo l w ill also go out if
the speed
exceeds the stored maximum speed
by more than about 25 mph (40 km/h) for at
least 10 seconds. The stored maximum speed
is deleted.
Setting speed warning 1
c:>page 30.
Speed warning 2 lCl/EOl (Canada m odels )
Storing warning 2 is recommended if you al­
ways
want to be remi nded of a certa in speed,
for example when you a re traveling i n a cou n­
try that has a general maximum speed limit,
or if you do not want to exceed a specified
speed for winter tires.
The speed wa rning 2 symbol,
1a1;[i] (Canada
models) appears in the disp lay when you ex­
ceed the stored speed limit . Unlike warn ing 1,
it will not go out unti l the vehicle speed drops
be low the stored speed limit.
Sett ing speed warning 2
c:> page 30 .
({) Tips
Even tho ugh you r vehicle is equipped with
a speed w arning sys tem, you should s till
watch the speedomete r to make sure you
are not driving faster tha n the speed limit.
Speed warning 1: setting a speed limit
Warning threshold 1 is set by the button .
Fig. 25 Sect ion of instrument cluster: Set/Check but ­
ton
Storing the ma ximum speed
.,. Drive at the desired maximum speed.
.,. Press the knob button
c:> fig. 25 until the
symbo l
c:> page 29, fig. 24 appears.
Resett ing the maximum spe ed
.,. Drive the vehicle at a speed of at leas t
3 mph (5 km/h)
.,._ Press the knob for more than 2 seconds.
T he speed wa rn ing symbol
ID] (USA models)/
f•j (Canada models) wi ll appear briefly in the
display when you release the button to indi­
cate that the maxim um speed has been stored
s uccessfully . The max imum speed remains
stored until it is changed by pressing the but­
ton aga in briefly or unt il it is de leted by a
leng thy push on the button .
Speed warning 2: setting a speed limit
Switches in the wiper arm are used to operate
warning threshold 2.
----- @
Fig. 26 Contro ls

For example, in a frontal collision at a speed
of 30 mph (48 km/h), the forces acting on a 10- lb (4.5 kg) object are about 20 times the
normal weight of the item. This means that
t he we ight of the item would suddenly be
about 200 lbs . (90 kg). You can imagine the
in juries that a 200 lbs. (90 kg) item flyi ng
freely through the passenge r compartment
could cause in a collision like t his.
_& WARNING
Imprope rly stored luggage or other items
can fly through the vehicle ca us ing se rious
personal inj ury in the event of hard b rak ­
ing or an acc ident. To help reduce the r is k
of serious personal injury :
- Always put objects, for examp le, luggage
o r othe r heavy items in the luggage com­
partment .
_& WARNING
Heavy loads will influence the way your ve­
hicle handles. To help reduce the r isk of a
loss of control leading to ser ious personal
injury:
- Always keep in m ind whe n transporting
heavy objects, t hat a change in t he cen ­
ter of g ravity can also cause changes in
vehicl e handling.
- Never exceed the G ross Ax le Weight Rat­
ing or t he Gross Veh icle We ight Rating
spe cified on t he safety compliance stic k­
er on the left door jamb. Exc eeding pe r­
missib le we igh t standa rds can cause the
vehicle to s lide and handle differently.
- Please observe info rm ation on s afe driv­
ing
~ page 91.
_& WARNING ,~ ~
Always make su re that the doors, all win ­
dows and the front lid are securely closed
an d locked to red uce the risk of in jury
when the veh icle is not being used .
- After closing the front lid, a lways make
s u re that it is properly closed and locked.
- Never leave you r vehicle unatten ded es­
pecially with the front lid left open . A
Dr iving S afel y 97
child cou ld craw l into the luggage com­
pa rtment and close the front lid becom­
ing trapped and unable to get out. Be ing
trapped in a veh icle can lead to serious
pe rsonal injury .
- Never let ch ildren play i n or around the
veh icle .
- Never let passengers ride in t he luggage
compartment . Vehicle occupants must
always be prope rly restra ined in one of
the vehicle 's seating pos it ions .
(D Tips
The t ire pressure must correspond to the
l oad . The t ire press ure is shown on the tire
p ressure label. The tire pressure label is lo­
cated on the d river 's s ide B-pillar. The t ire
pressure label lists the recommended cold
tire inflation pressures for the vehicle at
it s m aximum c apac ity we igh t a nd the tires
that we re on your vehicle at the t ime it
was manufacture d. For recommended tire
pressures fo r normal load cond it ions,
pleas@ s@@ chapter c::> page 187.
Reporting Safety
Defects
Applicable to U.S.A.
If you believe that your vehi cle
ha s a defect which could cau se
a crash or could caus e injury or
death, you should immediately inform the National Highway
Traffic Safety Administration (NHTSA) in addition to notify­
ing Audi of Amer ica , Inc .
If NHTSA recei ves similar com­
plaints, it may open an investi­
gation , and if it finds that a
s afet y defect s exists in a group .,.
•
•

Driving with your
quattro ®
With all-wheel drive, all four wheels are driv­
en .
Gene ral inform ation
W ith all-wheel dr ive, power is distributed to
all four wheels . This happens automatically
depending on your driving style and the road
conditions at the t ime . See also <::;>
page 142.
Winter t ires
When driving in the winter, your vehicle with
all-wheel drive has an advantage, even with
regular tires. In winter road conditions it may
be advisable to mount winter tires (or all -sea­
son t ires) for improved driveability and brak­
ing: these tires must be mounted on
a ll f our
wheel s.
Snow chain s
Where snow chains are mandatory on certain
roads, th is normally also applies to vehicles
with all-wheel drive
Qpage 198, Snow
chains.
Replacing wheel s/tire s
Only the wheel/tire sizes specified by the
manufacturer may be used on vehicles with
all-wheel drive
<=> page 193 .
A WARNING
-Always adjust your driving to road and
traffic conditions. Do not let the extra
safety affo rded by a ll-wheel d rive tempt
you into taking extra risks .
- Although a ll-wheel drive is ve ry effect ive,
always remember that braking capacity
is limited by tire traction . You should
therefore not drive at excessive speeds
on icy or slippery road surfaces.
- On wet road surfaces, be careful not to drive too fast because the front wheels
cou ld begin to slide on top of the water
(aquaplaning). If this should occur, you
will have no warning from a sudden in­ crease in engine speed as with a front-
-
Int ellig ent technolog y 147
wheel drive vehicle. Always drive at
speeds which are su ited to the road con­
ditions. -risk of crash.
Energy management
Starting ability is optimized
Energy management controls the distribution
of electrical energy and thus optimizes the
availability of electrical energy for starting the engine.
If a vehicle with a conventional energy system
is not driven for a long per iod of t ime, the bat­
te ry is d ischarged by idling current consumers
(e .g. immobi lizer). In certain circumstances it
can resu lt in the re being insufficient energy
available to start the engine.
Intelligent energy management in your vehi­
cle handles the distribution of e lectr ica l ene r­
gy. Starting ability is markedly improved and
the life of the battery is extended .
Bas ica lly, energy management consists of
b atte ry diag nosis, idling current m an age­
m ent
and dy namic energ y manag ement .
Batte ry diagno sis
Battery diagnosis continuously determines
the state of the batte ry. Sensors determine
battery voltage, battery current and batte ry
temperature . This determines the current
state of charge and the power of the battery.
Idling current manag ement
Idling current management reduces energy
consumption while the vehicle is standing.
Wi th the ign ition switched off, it controls the
energy supply to the various electrica l compo ­
nents. Data from battery diagnosis is consid­
ered.
Depend ing on the ba ttery's state of charge,
individual cons umers are gradually turned off
to prevent excessive discharge of the battery
and thus maintain starting capability. .,..
•
•

-Have you r vehicle maintained properly
and in accordance with the service rec­
ommendat ions in your Warranty
& Main­
tenance booklet.
- Lack of proper maintenance as well as
improper use of the vehicle will impair
the function of the Emission Control Sys­
tem and could lead to damage.
Sporty driving
Warming up and cooling down
By carefully warming up and cooling down
your vehicle, you can he lp ensure that it is not
overstressed unnecessarily during sporty driv ­
ing.
When warming up, the vehicle is driven at a maximum engine speed of 6000 RPM
(Vl0 engine) or 7000 RPM (V8 engine) in or­
der to raise the engine oil temperature to a minimum of 140 °F (60 °(). The tires also on­
ly reach their full road holding capability once
they have warmed up.
The cooling fan can continue to run in your ve­ hicle after the engine is switched
off. H owev­
er, driving the vehicle to cool it down is part ic­
ularly important. During sporty driving, the
engine and brakes, the exhaust system, and
the t ransm ission all become extreme ly hot.
Before you park the vehicle, you shou ld d rive
it for a few mi les/kilometers at light load in
the low rpm range to allow it to coo l down .
Driving on a track
Before you take your vehicle out on a track,
ensure that it is in perfect condition. For ex­
ample, you should check the tire tread and the brake pads . It is best to increase t ire pressure
by about 0 .3 bar .
When driving on a track, oil consumption may be somewhat higher than in "normal" opera­
tion
¢ page 17 4 .
You shou ld definitely inspect your vehicle af­
ter subjecting it to severe condit ions. Are the
brake pads OK? Is there anything unusual
Dri vin g and en vironm ent 151
about the ti res, including the inner and outer
sidewa lls (e.g . tread, blistering)? Are the air
intakes free of leaves and tire dust? Is the o il
l evel OK?
Your authorized Audi dea ler or qua lified work­
shop will be happy to undertake an inspection
before and after use on the race track.
_& WARNING
-
Some race tracks (e.g. steeply banked
turns) may affect the response of the ESC.
(D Tips
- Review the track requirements and con­
ditions before you start driving.
- When driven on a race track, all vehicle
parts are severe ly stressed. This can re­
sult in increased wear.
Operation and maintenance
Fuel economy, env ironmenta l impact, and
wear on your eng ine, brakes and tires la rgely
depend on three facto rs:
- your personal driving style
- operating conditions
- technical limitations
By havi ng your ve hicle reg ularly se rviced by an
a uthorized Aud i dea le r helps to ens ure that i t
runs properly and economica lly. The condition
of your vehicle not only affects its safety and
ability to ho ld its va lue, it a lso affects
f u el
consumption .
The amount of oi l used is re lated to engine
load and speed .
It is normal for the oil consump tion of a new
engine to reach its lowest value after a certa in
mileage has been driven.
You must drive your veh icle about 3,000 m iles
(5,000 kilometers) before yo u can p rope rly
assess oil consumpt io n.
Th is also app lies to fue l consumption and en-
gine o utp ut.
IJll>
•
•

154 Cleaning and protection
Hand washing
When washing your vehicle by hand, first soft­
en the dirt with copious amounts of water and rinse it
off as best you can.
Then clean the vehicle using a soft
sponge, an
auto glove or a low-pressure wash brush.
Work from the top down to the bottom, start­
ing with the convertible top
¢ page 156. Use
a
shampoo only for very stubborn dirt.
Rinse the sponge or auto glove thoroughly at
frequent intervals.
Clean the wheels, door sills and similar areas last . Use a separate sponge for this.
_& WARNING
- Car washes with conveyors can damage
the vehicle tires, which could cause the tire to lose pressure suddenly while driv­
ing and put you at risk for an accident.
Do not use car washes with conveyors.
- Switch
off the ignition when you wash
your vehicle to avoid an accident.
- Protect your hands and arms from sharp
metal edges when you clean the under­
body, the inside of the wheel wells or the
wheel covers to avoid cutting yourself.
- When washing your vehicle in the winter:
Moisture and ice in the brake system can
affect the brakes.
- Never wash tires with a jet that sprays
water in a direct stream. This could cause invisible damage to the tires and weaken
them, even if the spray is from a relative­ ly long distance and for a short time.
Damaged and weakened tires can fail
and cause accidents and personal injury.
(D Note
- Never drive your vehicle through any au­ tomatic car wash that fails to provide ei­
ther sufficient clearance for your vehicle
or sufficient track width for your tires. Risk of expensive damage to the vehicle's
underbody , tires, and rims!
- As described in your Warranty
& Mainte­
nance booklet, damage or malfunction due to misuse of the vehicle or failure to
operate the vehicle in accordance with
the
instructions of this Owner's Manual
will not be covered under warranty.
- Fold the exterior mirrors flat - there is a
risk of damaging the exterior mirrors.
Power folding exterior mirrors must not
be folded in or out by hand. Use the pow­
er function!
- Do not wash the vehicle in direct sun­
light. You may damage the paint.
- Do not use sponges designed to remove
insects, rough kitchen sponges, or simi­
lar products. You risk damaging the
paint surface.
- You should remove debris (such as in­
sects) from the headlight lenses on a
regular basis, for example when refuel­
ing your vehicle. Never clean the head­
lights with a dry cloth or sponge . Use a
wet cloth or sponge.
It is best to use
soapy water.
- Never clean tires using a nozzle that
sprays water in a direct stream. Damage
can occur even with a relatively long
spraying distance and for a very short
time.
- To avoid damaging your vehicle, always
make sure that there is sufficient dis­
tance between the spray head and soft materials like rubber hoses, plastic parts
and sound-deadening materials. Never
aim the spray head at the same point for
a long time. This also applies to cleaning
headlights and painted bumpers. Re­
member: the closer the nozzle is to the
surface of the material, the greater the
stress on the material.
- Never clean the convertible top using a
power washer.
@) For the sake of the environment
Wash your vehicle only at specially de­
signed facilities. They can prevent any dirty
water contaminated by oil from entering
the waste water. In certain areas washing
a car outside of such facilities is not per­ mitted.

Tires and wheels
Tires
General notes
Tires may be the least appreciated and most
abused parts of a motor vehicle .
Tires may be the least appreciated and most
abused parts of a motor vehicle . T ires are,
however, one of the most important parts of a
vehicle, particularly considering the compara­
tively small patch of rubber on eac h tire that
assures that a ll- important contact between
you, you r vehicle and the road.
Maintaining the correct tire pressure, mak ing
sure that your vehicle and its tires do not have
to carry mo re weight than they can safely han­
d le, avoiding damage from road hazards and
r eg ularly inspec ting t ires for damage i nclud­
ing cuts, slashes irregu la r wear and ove rall
condition are the most important things that
you can do to he lp avoid sudden tire failure in­
cluding tread separat ion and blowouts.
Avoiding damage If you have to d rive over a curb or similar ob­
stacle, drive very slow ly and as close as possi ­
b le at a right angle to the curb.
A lways keep chemicals includ ing grease, o il ,
gasoline and brake fluid off the t ires .
I nspect the t ires regularly for damage (cuts,
cracks or b listers, etc.). Remove any fo reign
bod ies embedde d in the treads.
Storing tires Mark tires when you remove them to indicate
the direction of rotation . T his ensures you to
be ab le to mount them correctly when you re­
i nstall them .
When removed, the whee ls or t ires should be
sto red in a cool, d ry and preferably dark place .
Store tires in a vertical pos ition if they are not
mounted on rims, in a horizontal pos it ion if
they are mounted on rims .
Tires an d wheel s 183
New tires
New tir es have to be broken in ¢ & .
The tread depth of new t ires may vary, accord­
ing to the type a nd make of t ire and the tread
pa tte rn.
Hidden damage
Damage to tires and r ims is ofte n not readily
visible . If you notice unusual v ib rat io n or the
vehicle p ulls to one s ide, th is may ind icate
that one of the t ires has been damaged . T he
ti res m ust be chec ked immed iate ly by an au­
thorized Audi dea le r or q ua lified wor kshop .
Unidirectional tires
A un idirectional tire can be identified by ar­
rows on the s idewa ll, that po int in the direc­
tion the t ire is designed to rotate. You mus t
f ol low the specified di rection o f rotation . T his
is necessary so that these tires can develop
their optimum characteristics regarding grip, road noise, wear and hydrop laning resistance.
For more information ¢
page 206.
A WARNING
New tires or t ires that are o ld, worn or
damaged cannot provide maximum con­
trol and braking ability .
-
-New tires tend to be slippery and must
be broken in. To reduce the r isk of losing
control, a co llision and ser ious personal
in ju ries, d rive with special ca re fo r the
fi rst 350 m iles ( 560 km).
- Driving with worn or damaged tires can
lead to loss of control, sudden tire fail­
ure, including a blowout and sudden de­
fl ation, c ras hes and se riou s personal in­
juries . Have wo rn or damaged t ires re­
placed immediate ly.
- Ti res age even if they are not being used
and can fai l sudden ly, especially at hig h
spee ds. Tires that are more than 6 years
old can only be used in an emergency
and then w ith special care and at low
speed.
•
•

184 Tire s and wheel s
-Ne ver mount used tires on yo ur vehicle if
yo u are not sure of their "previous histo­
ry. " Old used tires may have been dam­
aged even though the damage cannot be
seen that can lead to sudden tire failure
and loss of vehicle control.
Glossary of tire and loading terminology
Accessory weight means t he comb ined we ight (in excess of
those standard items which may be rep laced)
of R t ron ic, powe r stee ring, powe r brakes,
power w indows, power sea ts, r ad io, and hea t­
e r, to the extent that these i tems are available
as facto ry -in stalled equipment (whether in ­
stalled or not).
Aspect ratio
means t he ratio o f the he ight to the w idth of
the tire in percent. Numbers of 55 or lower in ­
d icate a low sidewall fo r improved s teer ing re ­
sponse and better overall handling on dry
pavement.
Bead
means t he part of the tire that is made o f
steel wires, wr apped o r reinforce d by p ly co rds
and that is shaped to fi t the r im.
Bead separation
means a b reakdown of the bond between
compo nents in the bead.
Cord means the strands forming the plies in the
tire.
Cold tire inflation pressure
means t he tire pressure recommended by the
ve hicle manufacturer for a tire of a designated
size that has not been dr iven for more than a
couple of miles (kilometers) at low speeds in
the three hour period before the tire pressure i s measu red or adjusted. -
If you notice un usual vibration or if the
veh icle pulls to one side when driv ing, a l­
ways stop as soon as it is safe to do so and check the wheels and tires for dam­
age.
Curb weight
means the we ight of a motor ve hicle w it h
standard equipment includ ing the max imum
capa city of fuel, o il, and coolant, a ir cond i­
ti on ing and additional weig ht o f option al
equipmen t.
Extra load tire
means a t ire designed to operate at higher
loads and at highe r inflat ion p ress ures tha n
the cor responding standard tire. Extr a load
t i r es my be i dent ified as "XL" , "xl", "E XTRA
LO AD", or "RF" on the sidewall.
Gross Axle Weight Rating ( "GAWR ")
means the load-carry ing capacity of a s ingle
axle system, measured at the tire-ground in­
te rfaces.
Gross Vehicle Weight Rating ( "GVWR ")
means the maximum tota l loaded we ight of
the vehicle.
Groove
means the space between two adjacent tread
ribs .
Load rat ing (code )
me ans the maximum load that a tire is rated
to carry fo r a given inflation press ure. Yo u
may not fi nd this information on all tires be­
ca use it is not required by law.
Maximum load rating
me ans the lo ad r ati ng fo r a tire a t the m axi­
mum perm issib le inf lation pressure for that
ti re .

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 inflation pressure
to which a tire may be inflated. Also called
"maximum inflation pressu re."
Normal occupant weight
means 150 lbs. (68 k ilograms) times the
number of occupants seated in the vehicle up
to the total seating capacity of your vehicle.
Occupant distribution
means distribution of occupants in a vehicle .
Outer diameter means the overall diameter of an inflated new
tire.
Overall width
means the linear distance between the exteri­
ors of the sidewalls of an inflated tire, includ­
ing e levations due to labeling, decorations, or
protective bands or ribs.
Ply
means a layer of rubber-coated para llel cords.
Production options weight
means the comb ined weight of those installed
regular production options weighing over 5
lbs . (2 .3 kg) in excess of those standard items
which they replace, not previously considered
in curb weight or accessory weight, including
heavy duty brakes, r ide leve lers, roof rack,
heavy duty battery, and specia l trim .
Radial ply tire
means a pneumatic t ire in which the p ly cords
that extend to the beads are laid at substan­
tially 90 degrees to the centerline of the
tread.
Tires and wheels 185
Recommended inflation pressure
see~
page 184, Cold tire inflation pressure.
Reinforced tire
means a t ire designed to operate at higher
loads and at higher inflat ion pressures than
the corresponding standard tire. Reinforced
ti res my be ident ified as "XL" , "xl", " EXTRA
LOAD", or "RF" on the sidewall.
Rim
means a metal support for a tire or a t ire and
tube assembly upon which the tire beads are
seated.
Rim diameter
means nom inal d iameter of the bead seat. If
you change your wheel s ize, you w ill have to
purchase new tires to match the new r im di­
ameter.
Rim size designation
means r im diameter and width.
Rim width
means nom inal distance between rim fla nges.
Sidewall
means that portion of a tire between the
tread and bead.
Speed rating (letter code)
means the speed at which a tire is designed to
be driven for extended periods of time. The
ratings range from 93 mph (150 km/h) to
186 mph (298 km/h)
~pag e 194 . You may
not find this information on all tires because
it is not requ ired by law.
T he speed rating letter code, where applica­
ble, is molded on the tire sidewall and indi­
cates the maximum pe rmissib le road speeds
~ .&. in Winter tires on page 198.
Tire pressure monitoring system
means a system that detects when one or
more of a veh icle's tires are underinflated and
illuminates a low tire pressure warning tell­
tale.
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