tire pressure AUDI TT ROADSTER 2015 Owners Manual

Knee airbags . . . . . . . . . . . . . . . . . . . . . 123
Side airbags . . . . . . . . . . . . . . . . . . . . . 125
Child Safety . . . . . . . . . . . . . . . . . . . 129
Important things to know ......... .
Child safety seats ................ .
Instal ling a chi ld safety seat .. .. .. . .
Additional Information ........... .
Vehicle operation ............ .
Intelligent technology .. .. .. . .
Notice about data recorded by vehicle
control modules .............. ... .
Electronic Stabilization Control (ESC) .
Rear spoiler ................ ... . .
Braking ........................ .
E lect ro-me chan ical power assis t ... . .
D riving w ith your quattro ......... .
Energy management ............. .
Driving and environment .....
The first 1,000 miles (1,500 km) and
afterwards .............. .. .. .. . .
Avoid damaging the vehicle ........ .
Driving through water on roads ... . .
Catalytic converter ............... .
Shutting down vehicle ............ .
Operate your vehicle economically and
minimize pollution ............... . 129
134
137
140
141
141
141
14 1
143
144
145
1 46
146
1 4 9
149
150
150 150
151
15 1
Tra iler towing . . . . . . . . . . . . . . . . . . . . 153
Vehicle care . . . . . . . . . . . . . . . . . . . 154
Vehicle care and cleaning . . . . . 154
General information . . . . . . . . . . . . . . 154
Car washes . . . . . . . . . . . . . . . . . . . . . . 154
Cleaning and care information . . . . . . 155
Fuel supply and filling your
fuel tank . . . . . . . . . . . . . . . . . . . . . . .
160
Gasoline . . . . . . . . . . . . . . . . . . . . . . . . 160
Fuel tank. . . . . . . . . . . . . . . . . . . . . . . . 161
Checking and filling . . . . . . . . . . . 164
Engine hood . . . . . . . . . . . . . . . . . . . . . 164
Eng ine oil . . . . . . . . . . . . . . . . . . . . . . . 166
Eng ine cooling system ............. 171
Brake fluid ...................... 174
Table of contents 3
Battery . . . . . . . . . . . . . . . . . . . . . . . . . 175
Windshield/headlight washer
container . . . . . . . . . . . . . . . . . . . . . . . 179
Tires and wheels ........... .. .
Tires ..... .. .... .. . .. .......... .
Tire pressure monitoring system ... .
Run-flat tire s .. .. ............... .
Do-it-yourself service ........ .
What do I do now? ........... .
Trunk escape handle ............. .
Vehicle tool kit .... .............. .
T ire repai r .... ... .. ............. .
What should I be aware of when
h . t
' 7 c angmg a ire .................. .
Fuses and bulbs .. .. .. ..... ... .
El ectr ical fuses . .. .. ............. .
Bulbs .......................... .
Emergency situations ........ .
General ........................ .
Starting by pushing or towing ...... .
Starting with jumper cables ....... .
U se of jump er cables ............. .
Emergency towing with commercia l
tow truck ...................... .
Lifting vehicle .. .. ............... . 180
180
198
201
204
204
204
204
205
208
212
212
215
2 16
216
216
216
217
218
221
Technical data . . . . . . . . . . . . . . . . . 222
Technical Data . . . . . . . . . . . . . . . . . 222
Vehicle identification . . . . . . . . . . . . . . 222
Weights . . . . . . . . . . . . . . . . . . . . . . . . 222
Dimensions . . . . . . . . . . . . . . . . . . . . . . 223
Capacities . . . . . . . . . . . . . . . . . . . . . . . 223
Gasoline engines . . . . . . . . . . . . . . . . . 224
Consumer Information . . . . . . . 225
Warranty coverages . . . . . . . . . . . . . . . 225
Operating your vehicle outside the
U.S. A. or Canada . . . . . . . . . . . . . . . . . 225
Audi Service Repair Manuals and
Literature . . . . . . . . . . . . . . . . . . . . . . . 225
Maintenance. . . . . . . . . . . . . . . . . . . . . 225
Additional accessories, modifications
and parts rep lacement . . . . . . . . . . . . 227
•
•

Instrument s and warnin g/indic ator ligh ts 13
road, stop the engine, and turn on the
emergency flasher¢
page 51.
-The engine com partment of any motor
vehicle is a potentially hazardous area.
Before you check anything in the engine
compartment, stop the engine and let it
cool down. Always exercise extreme cau­
t ion when wor king under the hood
¢ page 164, Working in the engine
compartment
@ Tips
Ma lfunctions or faults w ill be identified e i­
ther with a red symbo l (pr iority 1 -Dan­
ge r!) o r with a ye llow symbol (pr iority 2 -
Warn ing).
Overview
Some ind icator lights turn on briefly to check
the function of that system when yo u switch
the ignition on. These systems are marked
with a./ in the following tab les. If one of
these ind icator lights does not turn on, there
is a malfunction in that system.
R ed indicator lights
Red symbols indicate a priority malfu nction -
Danger!
- P ull off the road.
- Stop t he vehicle.
- T urn off the engine .
- Check the ma lfunction ing system. Contact
you r authorized Aud i dealer o r a qualified
workshop for assistance .
USA models: Malfunction in the
brake system ¢
page 14
Canada models: Malfunction in
the b rake system ¢
page 14
USA model s: Airbag system ./
¢page 15
Canada models: Airbag system ./
¢page 15
Safety belt
¢page 16
Battery ./
¢page 16
Engine oil pressure too low
¢page 16
Engine coolant leve l too low/
engine coolant temperature too
h igh
¢ page 17
Elect ro-mechanical power assis t
¢page 17
Clutch is overheat ing
¢ page86
Yellow indicator lights
Ye llow symbo ls indicate a prior ity 2 malfunc­
tion -Wa rning!
~ .,.,
OFF
ABS
(8)
"O~ I I ~ ,,
(D
TPMS
EPC
~
CHECK
Conver tible top
¢ page 17
Electro ni c Stabiliza tion Control
( E S C) ./ ¢
page 17
Elect ron ic Stabilization Control
( E SC) ./ ¢
page 17
USA models: anti-lock brake sys­
t em (ABS) ./ defective
¢page 18
Canada models : anti-lock brake
system (ABS) ./ defective
¢page 18
Worn brake pads
¢page 19
Tire pressure too low
¢page 199
Tire pressure monitoring system
¢page 199
Electro ni c power control./
¢page 19
USA models : Malfunction Indica­
to r Lamp (MIL)
¢page 19
Canada models : Malfunction Indi­
cator Lamp (MIL)
¢ page 19
Engine speed limitat ion *
¢page 19
Check engine oi l level
¢page 19

Driving Safely
General notes
Safe driving habits
Please remember -safety first!
This chapter contains important information,
tips, instructions and warnings that you need
to read and observe for your own safety, the
safety of your passengers and others . We have
summarized here what you need to know
about safety belts, airbags, child restraints as
well as child safety. Your safety is for us
priori­
ty number 1.
Always observe the information
and warnings in this section - for your own
safety as well as for that of your passengers.
The information in this section applies to all
model versions of your vehicle . Some of the
features described in this sections may be
standard equipment on some models, or may
be optional equipment on others. If you are
not sure, ask your authorized Audi dealer.
A WARNING
- Make certain that you follow the instruc­
tions and heed the WARNINGS in this
Manual. It is in your interest and in the
interest of your passengers.
- Always keep the complete Owner's Liter­
ature in your Audi when you lend or sell
your vehicle so that this important infor­
mation will always be available to the
driver and passengers.
- Always keep the Owner's literature handy
so that you can find it easily if you have
questions.
Safety equipment
The safety features are part of the occupant
restraint system and work together to help
reduce the risk of injury in a wide variety of
accident situations .
Your safety and the safety of your passengers
should not be left to chance. Advances in
technology have made a variety of features
available to help reduce the risk of injury in an
Driving Safely 91
accident. The following is a listing of just a
few of the safety features in your Audi:
- sophisticated safety belts for driver and all
passenger seating positions,
- safety belt pre-tensioners,
- front airbags,
- knee airbags for the front seats,
- side airbags in the front seats,
- LATCH anchorages for child restraints,
- adjustable steering column.
These individual safety features can work to­
gether as a system to help protect you and
your passengers in a wide range of accidents.
These features cannot work as a system if
they are not always properly adjusted and
properly used!
Safety is everybody's responsibility!
Important things to do before driving
Safety is everybody's job! Vehicle and occu­
pant safety always depends on the informed and careful driver.
For your safety and the safety of your passen­
gers,
before driving always:
~ Make sure that all lights and signals are op­
erating correctly .
~ Make sure that the tire pressure is correct.
~ Make sure that all windows are clean and af­
ford good visibility to the outside.
~ Secure all luggage and other items carefully
c::> page 65.
~ Make sure that nothing can interfere with
the pedals.
~ Adjust front seat, head restraint and mirrors
correctly for your height .
~ Instruct passengers to adjust the head re­
straints according to their height .
~ Make sure to use the right child restraint
correctly to protect children¢
page 129,
Child Safety.
~ Sit properly in your seat and make sure that
your passengers do the same¢
page 59,
General recommendations. .,..
•
•

92 Driving Safel y
• Fasten your safety be lt and wear it properly .
Also instruct your passengers to fasten their
safety belts proper ly ¢
page 100.
What impairs driving safety?
Safe driving is directly related to the condi­
tion of the vehicle, the driver as well as the
driver's ability to concentrate on the rood
without being distracted.
The driver is responsible for the safety of the
vehicle and all of its occupants. If your ability
to drive is impaired, safety risks for everybody
in the vehicle increase and you also become a
hazard to everyone else on the road ¢
.&,.
Therefore:
• Do not let yourself be distracted by passen­
gers or by using a cellular telephone.
• NEVER drive when your dr iving ability is im­
paired (by medicat ions, alcohol, drugs, etc.) .
• Observe all traffic laws, rules of the road
and speed limits and plain common sense.
• ALWAYS adjust your speed to road, traffic
and weather conditions.
• Take frequent breaks on long trips . Do not
drive for more than two hours at a stretch .
• Do NOT drive when you are tired , under
pressure or when you are stressed.
A WARNING ,.
Impai red driving safety increases the risk
of serious personal injury and death when­
ever a vehicle is being used.
Proper occupant
seating positions
Proper seating position for the driver
The proper driver seating position is impor­
tant for safe, relaxed driving.
Fig. 99 The correct distance between driver and steer­
ing whee l
For your own safety and to reduce the risk of
injury in the event of an accident, we recom­
mend that you adjust the driver's seat to the
f o llow ing position:
• Adjust the driver's seat so that you can easi­
ly push the pedals all the way to the floo r
while keeping your knee(s) slightly bent
q &_.
• Adjust the angle of the seatback so that it is
in an upright position so that your back
comes in full contact with it when you drive.
• Adjust the steering wheel so that there is a
distance of at least 10 inches (25 cm) be­
tween the steering wheel and your breast bone¢
fig. 99 . If not possible, see your au­
thorized Audi dealersh ip about adaptive
equ ipment.
• Adjust the steering wheel so that the steer­
ing wheel and airbag cover points at your
chest and not at your face.
• Grasp the top of the steering whee l with
your elbow(s) slightly bent.
• Adjust the he ad restraint so the upper edge
is as even as possible with the top of your
head . If that is not possible, try to adjust
the head restraint so that it is as close to
this pos ition as possib le.
• Fasten and wear safety belts correctly
¢page 103.

~ Distribute the load evenly in the luggage
compartment.
~ Always place and properly secure heavy items in the luggage compartment as far
forward as possible.
& WARNING
Improperly stored luggage or other items
can fly through the vehicle causing serious
personal injury in the event of hard brak­
ing or an accident. To help reduce the risk
of serious personal injury :
- Always put objects, for example, luggage
or other heavy items in the luggage com­
partment.
- Always secure objects in the luggage
compartment using the tie-down eyelets
and suitable straps.
& WARNING , ~
Heavy loads will influence the way your ve­
hicle handles. To help reduce the risk of a
loss of control leading to serious personal
injury:
- Always keep in mind when transporting
heavy objects, that a change in the cen­
ter of gravity can also cause changes in
vehicle handling:
- Always distribute the load as evenly as
possible.
- Place heavy objects as far forward in
the luggage compartment as possible.
- Never exceed the Gross Axle Weight Rat­
ing or the Gross Vehicle Weight Rating
specified on the safety compliance stick­
er on the left door jamb. Exceeding per­
missible weight standards can cause the
vehicle to slide and handle differently.
- Please observe information on safe driv­
ing
~ page 91.
& WARNING
To help prevent poisonous exhaust gas
from being drawn into the vehicle, always
keep the rear lid closed while driving.
- Never transport objects larger than
-
those fitting completely into the luggage
Driving Safely 97
area because the rear lid cannot be fully
closed.
- If you absolutely must drive with the rear
lid open, observe the following notes to
reduce the risk of poisoning:
- Close all windows,
- Close the convertible top,
- Open all air outlets in the instrument
panel,
- Switch off the air recirculation,
- Set the fresh air fan to the highest
speed.
& WARNING ~
Always make sure that the doors, all win-
dows, the convertible top and the rear lid
are securely closed and locked to reduce
the risk of injury when the vehicle is not
being used.
- After closing the rear lid, always make
sure that it is properly closed and locked .
- Never leave your vehicle unattended es ­
pecially with the rear lid left open . A
child could crawl into the vehicle through
the luggage compartment and close the
rear lid becoming trapped and unable to
get out. Being trapped in a vehicle can
lead to serious personal injury.
- Never let children play in or around the
vehicle.
- Never let passengers ride in the luggage
compartment. Vehicle occupants must
always be properly restrained in one of
the vehicle's seating positions.
(D Tips
- Air circulation helps to reduce window
fogging. Stale air escapes to the outside
through vents in the trim panel, on the
left side of the luggage compartment. Be sure to keep these slots free and
open.
- The tire pressure must correspond to the
load. The tire pressure is shown on the
tire pressure label. The tire pressure la­
bel is located on the driver's side B-pillar .
The tire pressure label lists the ..,_ •
•

144 Intelligent technology
-Never push the ve hicle or app ly force to
the rea r spo ile r - i t co uld be damaged .
- To prevent damage to the rear spoiler do
not lean o r place a nyth ing o n it.
- Only ope rate the rear spoi ler manually
when the rear lid is closed and t he rear
spo ile r moving parts are not blocked.
Otherwise, damage could occur.
C lean the spoi le r compartment every 2 to
3 months . The spoiler compartment must
always be free of ice, snow, leaves or other
debris.
Braking
General information
What affects braking efficiency?
Operating conditions and d riving habit s
The brakes on today's automob iles are st ill
subject to wea r, depend ing largely on operat­
i ng cond itions and dr iv ing habits
c:> & . On
ve hicles that a re e ithe r dr iven mostly in stop­
and-go city traffic o r a re driven ha rd , the
b rake pads should be checked by yo ur auth or­
iz ed A udi dealer more often th an specifie d in
the
Warranty & Maintenance booklet . Fail ure
to have your b ra ke pads inspected can res ult
in red uced b rake performance.
O n steep slopes, yo u sh ou ld use t he b ra ki ng
effect of the engine . This way, yo u preven t un­
necessa ry wear on the brake system . If you
must use yo ur brakes, do not ho ld the bra kes
down continuously . P u mp the brakes at inter­
va ls.
N oises may occur w hen braking depending on
the speed, bra king force and outside condi ­
tions s uch as temperature and h umidity.
Moisture or road salt
Unde r cert a in co ndi tions, for examp le, w hen
d riving through wate r or ve ry heavy rain , or
even after washing yo ur vehicle , the braking effect can be
reduced due to mois ture (or in
freez ing cond itions ice) on the brake pads. A
f ew cautio us brake applications s hou ld dry off
the brake pads or remove any ice coatings.
T he effec tiveness of the brakes can be red uce d
whe n the vehicle is d riven on a sa lt -covered
road and the b rakes are not used . Likewise,
yo u clean off acc umulated salt coat ing from
brake d iscs and pads with a few cautio us ap­
plicat ions o f th e b rake
c:> & .
Corrosion
The re may be a tendency for dirt to build up
on the brake pads and corros ion to form on
t h e d iscs if the car is not driven regu larly or
o n ly for short trips w ith litt le use of the
brakes .
If the brakes are not used frequently, or if cor­
ros ion has formed on the discs, it is adv isable
to clean off t he pads a nd d iscs by braking
firmly a few times from a moderately h igh
s p eed
c:> & .
Faults in the brake system
If you shou ld notice a sudden increase i n
brake pedal trave l, then one of the two brake
c ircuits may have fa iled
c:> & .
Low brake fluid level
Malfunctions ca n occ ur in the bra ke system if
t h e b rake fluid level is too low. The brake flu id
level is monitored electronica lly.
Brake booster
T he br ake boos ter inc reases the pressure tha t
yo u genera te with the b ra ke peda l. It works
o nl y when t he engine is runnin g
.c:> .&
Brake lining wear status
Br ake lining wear may be che cked by visual in­
spe ct io n of th e condition o f the br ake pa ds
t h ro ugh the open ing s in the wheel. If neces ­
sa ry, the w heel may be removed fo r thi s i n­
spect ion
c:> page 208, What should I be
aware of when changing a tire?.

154 Vehicle care and cleaning
Vehicle care and
cleaning
General information
Regular, proper care helps to maintain your
vehicle 's value. It can also be a requirement
when subm itting warranty claims for corro ­
sion damage and paint defects on the body .
The required cleaning and care products can be obtained from your authorized Audi dealer
or a qualified workshop. Read and follow the instructions for use on the packaging .
A WARNING
-Us ing cleaning and care products incor­
rectly can be dangerous to your hea lth .
- Always store cleaning and care products
out of reach of children to reduce the ris k
of poisoning.
@ For the sake of the environment
-Preferably use environmentally-friendly
products when buying cleaning agents .
- Do not d ispose of leftover cleaning and
ca re products with household trash .
Car washes
-
The longer that deposits such as insects, bird
droppings , tree sap or road salt rema in on the
vehicle, the more the surface can be dam­
aged. High temperatures such as those
caused by s unligh t increase the corrosive ef­
fect.
Before washing, wet heavy deposits with plen­
ty of water.
Also, wash the underside of your vehicle once
road salt stops be ing used for the season .
Pressure wa shers
When washing your vehicles with a pressure
washer, always follow the operating instruc­
tions provided w ith the pressure washer. Th is
is especially important in regard to the pres ­
sure and spray ing distance . Do not aim the
spray directly at seals on side w indows, doors, the
hood, the rear lid or the convertible top or
at tires, rubber hoses, insulating material
orsensors* . Keep a distance of at least 16 in ­
ches (40 cm) .
Do not remove snow and ice with a pressure
washer.
Never use rotary nozzles or high pressure noz­
zles.
The water temperature must not be above
140
°F (60 °() .
Automatic car washes
Spray off the vehicle before washing.
Make sure that the windows are closed and
the windshie ld wipers are off. Follow instruc­
tions from the car wash operator, especially if
there are accessories attached to your vehicle .
If possible, use car washes that do not have
brushes .
Washing by hand
Clean the vehicle starting from the top and
working down using a soft sponge or cleaning
brush . Use solvent-free cleaning products.
Washing vehicles with matte finish paint
by hand
To avoid damaging the paint when washing,
first remove dust and large particles from
your vehicle. Insects, grease spots and finger­
prints are best removed with a special cleaner
for matte finish paint .
Apply the product using a microfiber cloth. To
avoid damaging the paint surface, do not use
too much pressure.
Rinse the vehicle thoroughly with water. Then
clean using a neutra l shampoo and a soft mi ­
crofiber cloth.
Rinse the vehicl e thoroughly again and let it
air dry. Remove any water residue using a sham my.
Stubbo rn deposits such as bird droppings o r
tree sap are best removed with p lenty of wa-
ter and a microfiber cloth. .,.

180 Tire s and wheel s
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 . Tires are,
however, one of the most important parts of a
vehicle, particularly considering the compara­
tive ly small patch of rubber on each tire that
assures that a ll-impo rtant contact between
you, your 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 safe ly han­
d le, avoiding damage from road hazards and
reg ularly inspecting t ires for damage includ­
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 separation and blowouts.
Avoiding damage I f you have to drive over a curb or similar ob­
stacle, drive very s low ly and as close as possi ­
b le at a right angle to the curb.
A lways keep chem ica ls includ ing gre ase, o il,
gasoline and b rake fluid off the ti res .
Inspect the t ires regularly for damage (cuts,
cracks or b listers, etc.). Remove any fo reign
bod ies embedded in the treads.
Storing tires Mark tires when you remove them to indicate
the direction of rotation . Th is ensures you to
be ab le to mount them correctly when you re­
install t hem.
When removed, the whee ls or t ires should be
stored 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. New tire
s
New t ires have to be broken in¢&,. .
T he 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
vis ible . If you notice unusual v ibrat ion or the
vehicle p ulls to one side, th is may ind icate
t h at one of the t ires has been damaged . Th e
t ir es m ust be checked immed iate ly by an au ­
tho rized Aud i dea le r or q uali fied wor ks hop.
Unidirectional t ires
A un idirectional tire can be identified by ar­
rows on the sid ewa ll, that po int in the direc­
t ion the t ire is desig ned to rotate. You mus t
f ol low the specified d irection of rotation . This
is necessary so that these tires can develop
their optimum characterist ics regarding grip,
road no ise, wear and hyd rop laning resistance.
For more information
¢page 211.
A WARNING
-New tires or tires that are old, 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 risk of losing
control, a co llision and ser ious personal
in jur ies, d rive w ith special ca re fo r the
fi rst 350 m iles (560 km).
- Driving with worn or damaged tires can
le ad to loss of control, sudden tire fail­
ure, including a blowou t and sudden de­
fl ation, c rashes and seriou s personal in­
juries . Have wo rn or damaged t ires re­
p laced immediate ly .
- T ires age even if they are not being used
an d can fai l sudden ly, especially at high
speeds. Tires that are more than 6 years
old can only be used in an emergency
and then w ith specia l care and at low
speed.

-Never 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.
- If you notice unusual vibration or if the
vehicle pulls to one side when d riving, al­
ways stop as soon as it is safe to do so
and check the wheels and tires for dam­
age .
(D Note
-Please note that summer and winter
tires are designed for the cond itions that
are typ ic al in those seasons. Aud i recom­
mends using w inter t ires du ring the win-
Glossary of tire and loading terminology
Accessory weight
means the comb ined weight (in excess of
those standard items which may be replaced)
of automatic tra nsmission, power steering,
power brakes, power windows, power seats,
radio, and heater, to the extent that these
items are availab le as factory-installed equip­
ment (whether installed or not) .
Aspect ratio
means the ratio of the height to the width of
the tire in percent . Numbers of 55 or lower in­
d icate a low sidewall for improved steering re­
sponse and better overall handling on dry
pavement .
Bead
means the pa rt of the ti re that is made of
steel wires, wrapped or reinforced by ply cords
and that is shaped to fit the rim.
Bead s eparation
means a b reakdown of the bond between
components in the bead.
Cord
means the strands forming the plies in the
tire.
Tire s an d wheel s 181
ter months . Low temperatu res signifi­
cantly decrease the elastic ity of summer
t ires, which affects traction and braking
ability. If summer tires are used in very
co ld temperatures, cracks can form on
the tread bars, res ulting in permanent
ti re damage that can cause loud drivi ng
noise and unbalanced tires. Aud i is not
responsib le for this type of damage.
- Burn ished, polished or chromed rims
must not be used in winter weather. Th e
surfa ce of the rims does not have suffi­
c ien t cor rosion pro te cti on for this and
c o ul d be pe rmanen tly damaged by road
salt or similar substances. This damage
is not covered by warranty.
Cold tir e inflation pressure
me ans the t ire press ure re commended by the
vehicle manufacturer fo r a tire o f a des igna ted
size that has not bee n driven for more than a
coup le of miles (k ilomete rs) at low speeds in
the three hour pe riod before the tire press ure
is measured or adjusted.
Curb weight
means the weight o f a motor vehicle with
standard equipment including the maximum
capacity of fuel, o il, and coolant, air cond i­
tion ing and additional weight of optiona l
equipment.
E xtra load tire
means a tire designed to operate at higher
l oads and at higher inflation press ures than
the corresponding standard tire. Extra load
tires my be ident ified as "XL", "xl", "EXTRA
LOAD", or "RF" on the sidewall.
Gross Axle Weight Rating ("GAWR")
means the load-carrying capacity of a single
axle system, measured at the tire-ground in-
ter~ces.
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182 Tires and wheels
Gross Vehicle Weight Rating ("GVWR")
means the maximum total loaded weight o f
the vehicle.
Groove
means the space between two adjacent tread
ribs.
Load rating (code)
means the maximum load that a tire is rated
to carry for a given inflat ion pressure. You
may not find this informat ion on all tires be­
cause it is not requ ired by law .
Maximum load rating
means the load rating for a t ire at the maxi­
mum permissible inflation pressure for that
tire .
Maximum loaded vehicle weight
means the sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity we ight, and
(d) Production opt ions weight
Maximum (permissible) inflation pressure
means the maximum cold inflation pressure
to which a tire may be inflated . Also called
"maximum inflation press ure."
Normal occupant weight
means 150 lbs. (68 kilog rams) times the
number of occupants seated in the vehicle up
to the tota l seating capacity of your vehicle.
Occupant distribution
means distribution of occupants in a veh icle.
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 elevations due to labeling, decorations, or
protective bands or ribs .
Ply
means a layer of rubbe r-coated parallel cords.
Production options weight
means the combined weight of those installed
regular production opt ions we ighing over 5
lbs. (2.3 kg) in excess of those standa rd items
wh ich they replace, not previously considered
in curb weight or accessory weight, including
heavy duty brakes, ride levelers, heavy duty
battery, and specia l trim .
Radial ply tire
means a pneumat ic tire in which the ply cords
that extend to the beads are laid at substa n­
tially 90 deg rees to the centerline of the
tread.
Recommended inflation pressure
see <=;> page 181, Cold tire inflation pressure .
Reinforced tire
means a tire designed to operate at higher
loads and at higher inflation pressures than
the corresponding standard tire. Re inforced
t ir es my be identified 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 nominal diameter of the bead seat. If
you change your wheel s ize, you will have to
purchase new tires to match the new r im di­
ameter .
Rim size designation
means rim diameter and width.
Rim width
means nom inal distance between rim flanges.
Sidewall
means that portion of a t ire between the
tread and bead .