2012 INFINITI G-COUPE tire type

8-38Maintenance and do-it-yourself
4.Three-digit code: Tire type code
(Optional)
5.Three-digit code: Date of Manu-
facture
6.Four numbers represent the week
and year the tire was built. For
example, the numbers 3103
means the 31st week of 2003. If
these numbers are missing, then
look on the other sidewall of the
tire.
*3Tire ply composition and materi-
al
The number of layers or plies of
rubber-coated fabric in the tire.
Tire manufacturers also must
indicate the materials in the tire,
which include steel, nylon,
polyester, and others.
*4Maximum permissible inflation
pressure
This number is the greatest
amount of air pressure that
should be put in the tire. Do
not exceed the maximum per-missible inflation pressure.
*5Maximum load rating
This number indicates the max-
imum load in kilograms and
pounds that can be carried by
the tire. When replacing the tires
on the vehicle, always use a tire
that has the same load rating as
the factory installed tire.
*6Term of
“tubeless” or“tube
type”
Indicates whether the tire re-
quires an inner tube (“ tube
type”) or not (“tubeless”).
*7The word “radial”
The word “radial”is shown, if
the tire has radial structure.
*8Manufacturer or brand name
Manufacturer or brand name is
shown.
Other tire-related terminology:
In addition to the many terms that
are defined throughout this section,
Intended Outboard Sidewall is (1) the
sidewall that contains a whitewall, bears white lettering or bears manu-
facturer, brand and/or model name
molding that is higher or deeper than
the same molding on the other side-
wall of the tire, or (2) the outward
facing sidewall of an asymmetrical
tire that has a particular side that
must always face outward when
mounted on a vehicle.
TYPES OF TIRES
WARNING
.
When changing or replacing tires, be
sure all four tires are of the same type
(Example: Summer, All Season or Snow)
and construction. An INFINITI retailer
may be able to help you with information
about tire type, size, speed rating and
availability.
. Replacement tires may have a lower
speed rating than the factory equipped
tires, and may not match the potential
maximum vehicle speed. Never exceed
the maximum speed rating of the tire.
. Replacing tires with those not originally

specified by INFINITI could affect the
proper operation of the TPMS.
. For additional information regarding
tires, refer to “Important Tire Safety
Information” (US) or“Tire Safety Infor-
mation” (Canada) in the Warranty Infor-
mation Booklet.
All season tires
INFINITI specifies all season tires on some
models to provide good performance all
year, including snowy and icy road condi-
tions. All Season tires are identified by ALL
SEASON and/or M&S (Mud and Snow) on
the tire sidewall. Snow tires have better
snow traction than All Season tires and
may be more appropriate in some areas.
Summer tires
INFINITI specifies summer tires on some
models to provide superior performance on
dry roads. Summer tire performance is
substantially reduced in snow and ice.
Summer tires do not have the tire traction
rating M&S on the tire sidewall.
If you plan to operate your vehicle in snowy
or icy conditions, INFINITI recommends the
use of SNOW tires or ALL SEASON tires on all four wheels.
Snow tires
If snow tires are needed, it is necessary to
select tires equivalent in size and load
rating to the original equipment tires. If
you do not, it can adversely affect the
safety and handling of your vehicle.
Generally, snow tires will have lower speed
ratings than factory equipped tires and
may not match the potential maximum
vehicle speed. Never exceed the maximum
speed rating of the tire.
If you install snow tires, they must be the
same size, brand, construction and tread
pattern on all four wheels.
For additional traction on icy roads,
studded tires may be used. However, some
U.S. states and Canadian provinces prohi-
bit their use. Check local, state and
provincial laws before installing studded
tires. Skid and traction capabilities of
studded snow tires, on wet or dry surfaces,
may be poorer than that of non-studded
snow tires.
TIRE CHAINS
Use of tire chains may be prohibited
according to location. Check the local laws
before installing tire chains. When instal-
ling tire chains, make sure they are the
proper size for the tires on your vehicle and
are installed according to the chain man-
ufacturer’
s suggestions. Use only SAE
Class S chains. Class“S”chains are used
on vehicles with restricted tire to vehicle
clearance. Vehicles that can use Class “S”
chains are designed to meet the SAE
standard minimum clearances between
the tire and the closest vehicle suspension
or body component required to accommo-
date the use of a winter traction device (tire
chains or cables). The minimum clearances
are determined using the factory equipped
tire size. Other types may damage your
vehicle. Use chain tensioners when recom-
mended by the tire chain manufacturer to
ensure a tight fit. Loose end links of the
tire chain must be secured or removed to
prevent the possibility of whipping action
damage to the fenders or underbody. If
possible, avoid fully loading your vehicle
when using tire chains. In addition, drive at
a reduced speed. Otherwise, your vehicle
may be damaged and/or vehicle handling
Maintenance and do-it-yourself8-39

8-40Maintenance and do-it-yourself
and performance may be adversely af-
fected.
Tire chains must be installed only on the
rear wheels and not on the front wheels.
Never install tire chains on a TEMPORARY
USE ONLY spare tire.
Do not use tire chains on dry roads. Driving
with tire chains in such conditions can
cause damage to the various mechanisms
of the vehicle due to some overstress.
SDI1662
CHANGING WHEELS AND TIRES
Tire rotation (Models equipped with
same size tires on all wheels)
INFINITI recommends rotating the
tires every 7,500 miles (12,000 km).
(See“Flat tire” (P.6-2) for tire repla-
cing procedures.)
As soon as possible, tighten the
wheel nuts to the specified torque
with a torque wrench.
Wheel nut tightening torque:80 ft-lb (108 N·m) The wheel nuts must be kept tigh-
tened to the specification at all
times. It is recommended that wheel
nuts be tightened to the specifica-
tion at each tire rotation interval.
WARNING
.
After rotating the tires, check and
adjust the tire pressure.
. Retighten the wheel nuts when
the vehicle has been driven for
600 miles (1,000 km) (also in
cases of a flat tire, etc.).
. Do not include the T-type spare
tire or any other small size spare
tire in the tire rotation.
. For additional information regard-
ing tires, refer to “Important Tire
Safety Information ”(US) or “Tire
Safety Information ”(Canada) in
the Warranty Information Booklet.

8-42Maintenance and do-it-yourself
.The original tires have built-in
tread wear indicators. When wear
indicators are visible, the tire(s)
should be replaced.
. Tires degrade with age and use.
Have tires, including the spare,
over 6 years old checked by a
qualified technician, because
some tire damage may not be
obvious. Replace the tires as
necessary to prevent tire failure
and possible personal injury.
. Improper service of the spare tire
may result in serious personal
injury. If it is necessary to repair
the spare tire, contact an INFINITI
retailer.
. For additional information regard-
ing tires, refer to “Important Tire
Safety Information ”(US) or “Tire
Safety Information ”(Canada) in
the Warranty Information Booklet.Replacing wheels and tires
When replacing a tire, use the same size,
tread design, speed rating and load carry-
ing capacity as originally equipped. (See
“Specifications” (P.9-8) for recommended
types and sizes of tires and wheels.)
WARNING
. The use of tires other than those
recommended or the mixed use of tires
of different brands, construction (bias,
bias-belted or radial), or tread patterns
can adversely affect the ride, braking,
handling, ground clearance, body-to-tire
clearance, tire chain clearance, speed-
ometer calibration, headlight aim and
bumper height. Some of these effects
may lead to accidents and could result in
serious personal injury.
. If the wheels are changed for any
reason, always replace with wheels
which have the same off-set dimension.
Wheels of a different off-set could cause
premature tire wear, degrade vehicle
handling characteristics and/or interfer-
ence with the brake discs/drums. Such
interference can lead to decreased brak- ing efficiency and/or early brake pad/
shoe wear. See
“Wheels and tires” (P.9-
9) of this manual for wheel off-set
dimensions.
. When a spare tire is mounted or a wheel
is replaced, the TPMS will not function
and the low tire pressure warning light
will flash for approximately 1 minute.
The light will remain on after 1 minute.
Contact your INFINITI retailer as soon as
possible for tire replacement and/or
system resetting.
. Replacing tires with those not originally
specified by INFINITI could affect the
proper operation of the TPMS.
. Do not install a damaged or deformed
wheel or tire even if it has been repaired.
Such wheels or tires could have struc-
tural damage and could fail without
warning.
. The use of retread tire is not recom-
mended.
. For additional information regarding
tires, refer to “Important Tire Safety
Information” (US) or“Tire Safety Infor-
mation” (Canada) in the Warranty Infor-
mation Booklet.

All-Wheel Drive (AWD) models
CAUTION
.Always use tires of the same type, size,
brand, construction (bias, bias-belted or
radial), and tread pattern on all four
wheels. Failure to do so may result in a
circumference difference between tires
on the front and rear axles which will
cause excessive tire wear and may
damage the transmission, transfer case
and differential gears.
. ONLY use spare tires specified for the
AWD model.
If excessive tire wear is found, it is
recommended that all four tires be re-
placed with tires of the same size, brand,
construction and tread pattern. The tire
pressure and wheel alignment should also
be checked and corrected as necessary.
Contact an INFINITI retailer.
Wheel balance
Unbalanced wheels may affect vehicle
handling and tire life. Even with regular
use, wheels can get out of balance. There-
fore, they should be balanced as required. Wheel balance service should be per-
formed with the wheels off the vehicle.
Spin balancing the wheels on the vehicle
could lead to mechanical damage.
For additional information regarding tires,
refer to
“Important Tire Safety Information”
(US) or “Tire Safety Information” (Canada)
in the INFINITI Warranty Information Book-
let.
Care of wheels
See “Cleaning exterior” (P.7-2) for details
about care of the wheels.
Spare tire (TEMPORARY USE ONLY
(T-type) spare tire)
Observe the following precautions if the T-
type spare tire must be used, otherwise
your vehicle could be damaged or involved
in an accident.
WARNING
. The T-type spare tire should be used for
emergency use. It should be replaced
with the standard tire at the first
opportunity to avoid possible tire or
differential damage. .
Drive carefully while the TEMPORARY
USE ONLY spare tire is installed. Avoid
sharp turns and abrupt braking while
driving.
. Periodically check spare tire inflation
pressure. Always keep the pressure of
the TEMPORARY USE ONLY spare tire at
60 psi (420 kPa, 4.2 bar). Always keep
the pressure of the full size spare tire (if
so equipped) at the recommended pres-
sure for standard tires, as indicated on
the Tire and Loading Information label.
For Tire and Loading Information label
location, see “Tire and Loading Informa-
tion label” in the index of this manual.
. With the TEMPORARY USE ONLY spare
tire installed do not drive your vehicle at
speeds faster than 50 MPH (80 km/h).
. When driving on roads covered with
snow or ice, the TEMPORARY USE ONLY
spare tire should be used on the front
wheels and original tire used on the rear
wheels (drive wheels). Use tire chains
only on the two rear original tires.
. Tire tread of the TEMPORARY USE ONLY
spare tire will wear at a faster rate than
the standard tire. Replace the spare tire
as soon as the tread wear indicators
Maintenance and do-it-yourself8-43

WHEELS AND TIRES
Road wheel
Sedan:
TypeSize Offset in (mm)
Conventional 17
67-1/2J 1.77 (45)
18 67-1/2J 1.77 (45)
Front:
Rear: 18
67-1/2J
18 68-1/2J 1.77 (45)
1.97 (50)
Spare 17
64T
18 64T 1.18 (30)
0 (0)
Coupe:
Type
Size Offset in (mm)
Conventional 18
68J
19 68-1/2J 1.69 (43)
Front:
Rear: 19
68-1/2J
19 69J 1.69 (43)
1.77 (45)
Spare 17
64T
18 64T 1.18 (30)
0 (0)
Technical and consumer information9-9

9-10Technical and consumer information
Tire
Sedan:
TypeSize Pressure PSI (kPa) [Cold]
Conventional P225/55R17 95V
33 (230)
P225/50R18 94V
Front:
Rear: 225/50R18 95W
245/45R18 96W
Spare (T-type) T145/80D17 107M
T145/70R18 107M 60 (420)
Coupe:
Type
Size Pressure PSI (kPa) [Cold]
Conventional P225/50R18 94V
33 (230)
P225/45R19 92V 35 (240)
Front:
Rear: 225/45R19 92W
245/40R19 94W
35 (240)
Spare (T-type) T145/80D17 107M
T145/70R18 107M 60 (420)

10-6
Reporting safety defects ................................... 9-26
Roadside assistance program ............................. 6-2
Rollover .............................................................. 5-6
Roof, Moonroof ................................................. 2-55
S
SafetyChild seat belts ........................................... 1-21
Satellite radio operation ................................... 4-58
Seat adjustment Front power seat adjustment .......................... 1-3
Front seats ..................................................... 1-3
Seat belt(s) Child safety ................................................. 1-21
Infants ......................................................... 1-22
Injured persons ........................................... 1-16Larger children ............................................. 1-22
Precautions on seat belt usage .................... 1-14
Pre-crash seat belts ..................................... 1-16
Pregnant women .......................................... 1-16
Seat belt cleaning .......................................... 7-6
Seat belt extenders ...................................... 1-20
Seat belt maintenance ................................. 1-21
Seat belt warning light and chime ............... 2-17
Seat belts .................................................... 1-14
Seat belts with pretensioners ...................... 1-54
Shoulder belt height adjustment .................. 1-19
Small children ............................................. 1-22
Three-point type .......................................... 1-16
Seat synchronization function ........................... 3-32 Seat(s)
Driver-side memory ...................................... 3-31
Heated seats ............................................... 2-40
Seats ............................................................. 1-2
Security system
(INFINITI Vehicle Immobilizer System),
Engine start ...................................................... 2-30
Security system, Vehicle security system .......... 2-28
Selector lever, Shift lock release ....................... 5-17
Servicing climate control ................................... 4-41
SETTING button ................................................. 4-14
Shift lock release, Transmission ........................ 5-17
Shift “P”warning (Automatic
Transmission models) ....................................... 2-22
Shifting Automatic transmission ............................... 5-14
Manual transmission ................................... 5-18
Shoulder belt height adjustment ....................... 1-19
Sliding front passenger’s seat ............................. 1-5
Snow mode switch ............................................ 2-41
Sonar system .................................................... 5-48
Sonar system off switch .................................... 5-50
Spare tire ........................................................... 9-9
Spark plugs ...................................................... 8-20
Speedometer ...................................................... 2-7
Starting Before starting the engine ........................... 5-12
Jump starting ................................................. 6-8
Precautions when starting and driving ........... 5-3
Push starting ............................................... 6-10
Starting the engine ...................................... 5-13 STATUS button .................................................... 4-9
Status light, Front passenger air bag ................ 1-49
Steering
Power steering fluid ..................................... 8-14
Power steering system ................................. 5-50
Steering-wheel-mounted controls
for audio ...................................................... 4-87
Tilt/telescopic steering ................................. 3-26
Storage ............................................................. 2-45
Storage box ...................................................... 2-50
Stowing golf bags ............................................. 2-51
Sun visors ........................................................ 3-27
Sunglasses holder ............................................ 2-47
Supplemental air bag warning labels ................ 1-55
Supplemental air bag warning light ......... 1-55, 2-17
Supplemental restraint system .......................... 1-41
Precautions on supplemental
restraint system ........................................... 1-41
Switch
Autolight switch ........................................... 2-35
Fog light switch ........................................... 2-39
Hazard warning flasher switch ..................... 2-39
Headlight switch .......................................... 2-35
Ignition switch ............................................. 5-14
Ignition switch manual
transmission models .................................... 5-18
Power door lock switch .................................. 3-5
Rear window and outside mirror
defroster switch ........................................... 2-34
Snow mode switch ....................................... 2-41
Turn signal switch ........................................ 2-38