brake AUDI R8 SPYDER 2012 Owner's Guide

-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>
•
•

Cleaning and protect ion
General information
Regular core preserves vehicle value.
Regular and correct care will contribute to
maintaining the beauty and value of your Au­
d i. Furthermore, good care may be a condition
for substantiating a warranty cla im should
corrosion damage or paint defects occur.
Your authorized Audi R8 dealer has a variety
of
d edicat ed ve hicl e-car e produ ct s. Please
make sure you apply them correctly .
A WARNING
-Cleaning agents may be poisonous. Keep
them out of the reach of children.
- Heed all caution labels .
- Always read directions on the container before using any product. Follow the di­
rect ions carefu lly.
- Most chemical cleaners are concentrated and have to be diluted .
- Use spot removing fluids only in well
ventilated areas .
- Do not use gasoline, kerosene, d iesel
fuel, nail polis h remover or other volatile
fluids . They may be toxic, flammab le or
haza rdous i n other ways. Do not wash,
wa x or d ry the vehicle wi th the ign it ion
on or the eng ine running.
- Do not clean the undersides of chassis,
fenders, wheel covers, e tc. wit h out pro­
tecting your hands a nd arms . You may
c u t yourself on sharp -edged metal parts .
- Mois ture and ice on brakes may imp air
braking efficiency
c:> page 145, Broking.
T est the brakes ca refully each time you
wash the vehicle.
@) For the sake of the environment
Select only environmenta lly fr iend ly clean­
ing prod ucts . Leftover clean ing products
should not disposed of in the household
waste .
Cleaning and protec tion 153
Care of exterior
Washing your vehicle
T he longer i nsect rema ins, bird dropp ings,
t ree res in, road and indust rial d ust, tar , soo t
part icles, road salt, and o ther aggressive de­
pos its remain on the vehicle su rface, the more
lasting their destructive effect will be . High
temperatures, for example from intense sun­ light, intensify the corrosive effect.
After the end of winter road salting, the un­ derside of the vehicle shou ld be thoroughly
washed .
Automatic car washes
You must t ake the necessary precautions s uch
as clos ing t he windows and convert ible top
before using an automatic car wash.
If yo ur
vehicle has specia l accessories - e.g . spoilers,
radio antenna -it is best to speak to the oper­
ator of the car wash c:>(D .
Only use car washes where the vehicle re ­
mains stationary and the cleaning equipment
moves aro und the veh icle while washing and
drying. It is not possib le to use car washes
where the vehicle is moved forward on a con­
veyer
c:> ,& .
It is preferab le to wash your vehicle in a
brush less carwash .
Washing with a pow er wa sher
When was hing yo ur vehicle with a power
washe r, be sure to follow the operating in ­
structions for the power washer. This applies particu larly to the
p ressure and the spra ying
distance .
Mainta in sufficient distance from
soft materials such as rubber hoses, sound
deade ning mater ial, and the park ing aid sen­
sors* that are located i n the front or rear
bumper.
Do not use washers with
a ro tating jet or a
nozzle spraying
a h igh pressur e je t of wate r in
any case.
IJl,-
•
•

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.

Caring for vehicles with matte finish
paint
Applies to vehicles: with matte finish paint
Vehicles with matte finish paint require spe­
cial care due to the characteristics of the
paint.
Automatic car washes
You must take the necessary precautions such
as closi ng the windows before us ing an auto­
mat ic car wash. See the ca r wash attendant if
the re is special eq uipment on yo ur vehicle
such as a spoiler or remote cont ro l an tenna
¢ 0 .
Only use ca r was hes where t he vehicle re­
mains stationary and the washing eq uipment
moves around the vehicle when washing and
d rying.
It is not possible to use ca r washes
that move the ve hicle through the ca r wash
using a chain
~ .&. .
Only use car w ashes tha t use cloth cleaning
eq uipment, not brushes .
Washing with pressure washers
When washing your ve hicles w ith a pressure
washer, always follow the operating instruc­
tions provided w ith the pressure washer. This
i s especially important in rega rd to t he
pre s­
sure
and s praying di stance. Be su re to keep
enough distance from soft materials such as
rubber hoses or insulat ing mater ial as we ll as
from the parking system sensors*, wh ich are
loca ted in the front or rear bumper.
Never use
rotary nozzle s or high pre ssure
nozzles .
Washing by hand
To avo id damag ing t he pa int when w ash ing ,
firs t remove d ust and large pa rticles from
your vehicle . Insects, grease spots and finger­
p rints a re best removed with a
special cleaner
for matte finish pa int .
Apply the produc t using a mi crofiber cloth . To
avoid damaging the paint surface, do not use
too m uch press ure.
Cleaning and protec tion 155
Rinse the ve hicle thoroughly wi th water. Clean
the ve hicle starting at t he top and working to ­
ward the bottom using a
neutral shampoo
and a soft microfiber cloth . Stop frequent ly to
rinse the cloth thoroughly.
Clean the wheels and si ll pane ls last. Use a
clean
sponge on these areas.
R inse t he ve hicle thoroughly again and le t it
air dry. If there are any water spots, they can
be removed using a
leathe r cloth.
Clean again with the spe cial cleaner for matte
finish paint
if necessary .
Removing stubborn dirt
Bird droppings or tre e sap
are best remov ed
with plenty of wate r and a microfiber cloth .
You should rinse off
gasoline res idue immed i­
ate ly w ith plenty of water .
_& WARNING
-Wash your vehicle only whe n the ignition
is switched off to red uce the risk of a
cras h.
- To reduce the risk of c utting yourse lf,
protect your hands and a rms fro m meta l
pa rt s wi th sha rp edges when clea ning
the underbody, the ins ide of the whee l
housings or the whee l covers .
- If washing your ve hicle dur ing the win­
ter, mois ture and i ce in the brake system
can affect the vehicle 's braking ab ility .
(D Note
-Do not treat veh icle parts pain te d wi th
m att e fini sh paint u sing pol ishing m ate­
r ia ls or hard wax. These p rod ucts cou ld
cause damage to the appearance o r sur­
face that cannot be repaired .
- N ever use protective wax . It ca n destroy
the matte finish effect.
- Do not pla ce an y s tickers or magnetic
signs on vehi cle pa rts painted with
matte finish paint. The paint could be
damaged when the stickers or magnets
are removed.
•
•

158 Cleaning and protection
You shou ld also clean the inside of the win ­
dow g lass at regular intervals.
The cloth or chamois used on paint surfaces
con tains wax res idue. Use a separa te cloth or
chamois to d ry the window glass.
Cl eaning the rear window
Aud i recommends cleaning the window us ing
a soft cotton clot h and water m ixed wi th
clean ing solution or window cleaner (1:1 mix ­
ture) . To avoid streaks, do not wipe the win­
dow dry with paper towels.
D o not use any clea ning so lutions that conta in
ammonia, acids , si licone or fl uo ride or clean­
ers that are abrasive or co uld cause sc ratches.
Do not use any alkaline cleaning solutions.
A WARNING
- The windshie ld m ust not be treated with
water-repe llent materials. They can in­
crease glare under poor visib ility condi­
tions such as wetness, darkness, or when
the sun is low on the horizon. In addi­
t ion, they can cause the windshield wip­
ers to chatte r.
- Always read and heed all WARNINGS and
other information
¢ page 153.
(D Note
-Never use warm or hot water to remove
snow and ice from windows and mirrors.
This could cause the glass to crack .
- To prevent damage to the wires of the
rear defogger, do not place any adhesive
sticke rs on the inside of the rear window
over the wires.
- To help prevent d irt from scratch ing the
window, always scrape in a forward d i­
r ection - pushing the scraper away from
you - never back and forth .
Wheels
Regular care is required to preserve the deco­
rative appearance of the wheels . Road sa lt
and brake dust must be washed off regu larly
or the wheels wi ll be damaged. Use only special acid-free cleaning agents
. You
can find proper wheel cleaner at authorized
Audi dealers and specia lty stores . Do not leave
the cleaner on the wheels longer than speci­
fied. Wheel cleaners contain ing acid can dam­
age the surface of the wheel bolts .
Pa int polish or other abrasive materials must
not be used when caring for wheels . If the
protective coat ing has been damaged, from
stones for example, touch up the damage as
soon as possible.
A WARNING ,__
- Moisture and ice on b rakes may affect
b rak ing eff ic iency -
¢ page 145, Braking.
Test the b rakes carefully after each veh i­
cle wash.
- Always read and heed a ll WARNI NGS and
the informa tion
¢page 153.
Exhaust tail pipes
-
Road salt and other corrosive materials will
damage the material in the exhaust tail pipes
if they are not cleaned regularly. Do not clean
the tail pipes with wheel cleaner, pa int polish,
chrome polish or other abrasive cleaners.
Clean the tail pipes with car care products
that are suitable for sta inless steel.
Your authorized Audi dea ler can provide clean­
ing products that have been tested and ap­
proved for your vehicle.
Care of interior
Radio and navigation display
T he display may be cleaned with a soft cloth
and commercially-avai lab le "LCD cleaner".
The cloth should be coated lightly when the
cleaning solution when cleaning the display.
(D Note
To prevent scratches, only clean the dis­play when it is dry.

Checking and filling Engine compartment
lid
Working in the engine compartment
Be especially careful whenever you work in the engine compartment!
Whenever you must perform any work in the
engine compartment, for example checking
and filling the different fluids, there is a risk
of injury, burns and accidents. To prevent per­
sonal injury always observe the following
WARNINGS. The engine compartment of any
vehicle is a ha zardous area!
¢ &. .
_&. WARNING
To help avoid injury, before you check any­
thing under the engine compartment lid:
- Switch off the engine.
- Remove the ignition key.
- Apply the parking brake.
- Move selector lever of R tronic to "N"
(Neutral); put manual transmission in
Neutral.
- Always let the engine cool down. Hot
components will burn skin on contact.
- To reduce the risk of being burned, never
open the engine compartment lid if you
see or hear steam or coolant escaping
from the engine compartment. Wait un­
til no steam or coolant can be seen or heard before carefully opening the en­
gine compartment lid.
- Keep children away from the engine com­
partment .
- Never spill fluids on hot engine compo­
nents. They can cause a fire.
- Never open the coolant reservoir cap
when the engine is still warm. The cool­
ant system is pressurized and hot cool­
ant could spray out .
- Protect your face, hands and arm from
steam or hot engine coolant by placing a
thick rag over the cap when you open the
coolant reservoir .
Checking and filling 169
-If work on the fuel system or the electri­
cal system is necessary:
- Always disconnect the battery.
- Never smoke or work near heaters or open flames . Fluids in the engine com­
partment could start a fire.
- Keep an approved fire extinguisher im­
mediately available .
- To avoid electrical shock and personal in ­
jury while the engine is running or being started, never touch:
- Ignition cables
- Other components of the high voltage
electronic ignition system.
- If you must perform a check or repair
with the engine running:
- First, fully apply the parking brake,
move selector lever of R tronic to "N"
(Neutral); put manual transmission in
Neutral.
- Always use extreme caution to prevent clothing, jewelry, or long hair from get­
ting caught in the radiator fan, V-belts
or other moving parts, or from contact­
ing hot parts. Tie back hair before
starting, and wear no clothing that will
hang or droop into the engine.
- Minimize exposure to emission and
chemical hazards¢& .
A WARNING
California Proposition 65 Warning:
- Engine exhaust, some of its constituents,
and certain vehicle components contain
or emit chemicals known to the State of
California to cause cancer and birth de­
fects and reproductive harm. In addition,
certain fluids contained in vehicles and
certain products of component wear con­
tain or emit chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
- Battery posts, terminals and related ac­
cessories contain lead and lead com­
pounds, chemicals known to the State of
California to cause cancer and reproduc­
tive harms. Wash hands after handling.
•
•

178 Checking and filling
Brake fluid
Hove the brake fluid changed by an experi­
enced technician .
Brake fluid absorbs moisture from the air. If
the water content in the brake fluid is too
h igh, corrosion in the brake system may result
after a per iod of t ime . The bo iling po int of the
brake fluid w ill also decrease considerably and
decrease b rak ing performance .
Therefore, the brake f lu id must be changed
every two years . Always use new brake fluid
which conforms to Federal Motor Vehicle
Standard "FMVSS 1 16 DOT 4".
Brake fl uid is rep laced according to the Audi
maintenance service schedule. Your author­
ized Audi dealer is equipped with the necessa­
ry special tools and replacement parts, has
the necessary expe rtise, and can d ispose of
the used fluid .
.&_ WARNING
- Brake fluid is po iso nous. It mus t be s to r­
ed on ly in the closed orig inal con taine r
o ut o f th e reac h of children!
- Br ake f ailure can resul t from old o r in ap ­
propr iate brake fluid. Observe these pre ­
caut ions:
- Use o nly brake fluid that meets SAE
specification
J 1703 and co nfo rms to
Federal Motor Vehicle Sta ndard 116 .
A lways check wi th you r a uthori zed Aud i
dealer to m ake sur e you are u sing the
correct br ake f luid. The co rrec t type of
b rake fluid is a lso indica ted on the
b rake fluid reservoir .
- The brake flui d must be new. Heavy use
of the brakes can ca use a vapor loc k if
the brake fl uid is left in t he system too
l o ng. This can ser io usly affect the effi­
ciency of the brakes as well as yo ur
safety. This could result in an acc ident.
Brake fluid will damage the paint of your
veh icle.
{® For the sake of the environment
Because of the p rob lem of proper disposal
of brake fluid as well as the spec ia l too ls
required and the necessary expertise, we
recommend that you have the brake flu id
cha nged by yo ur autho rized Aud i dea le r.
Battery
General information
All work on the ba ttery requires technical
knowledge.
The battery is located be hind the cov er in the
l u ggage compa rtment. Remove the cover by
pu shing i t to the left an d lift ing it o ut.
The battery is practically maintenance-free
and is checked as pa rt of your ve hicle's main­
tenance se rv ices .
You are we ll advised to replace a battery that
i s older tha n 5 yea rs .
Disconnecting the battery terminals
Some vehicle f unctions (power window reg u­
l ators, for example) are lost if the battery te r­
mina ls are disconnected. T hese functions have
to be relearned after the battery termina ls are
co nn ected aga in . T o p revent th is, t he battery
shou ld only be disconnected from the ve hicle
elect ric al sy stem w hen abso lutely ne cessary
f or rep airs.
Vehicles not driven for long periods
The battery becomes d ischarged due to quies­
cent current consume rs even when the vehicle
is not used. With extended pe riods of non-use
in t he
cold season, yo u should have t he ve hi­
cle b attery removed by an autho riz ed Aud i
dealer or qualif ied workshop and stored in an
frost-free place. T his prevents the battery
from "freezing" and thereby being destroyed.
D uring the
warme r seasons it is enough to
disco nnect the battery negat ive terminal. Oc-
cas ionally charge a disconnected battery.
II>

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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