tire size INFINITI Q50 2018 Owner's Manual

8-44Do-it-yourself
.Replacing tires with those not origin-
ally specified by INFINITI could affect
the proper operation of the TPMS.
. The TPMS sensor may be damaged if
it is not handled correctly. Be careful
when handling the TPMS sensor.
. When replacing the TPMS sensor, the
ID registration may be required. It is
recommended you contact an
INFINITI retailer for ID registration.
. Do not use a valve stem cap that is
not specified by INFINITI. The valve
stem cap may become stuck.
. Be sure that the valve stem caps are
correctly fitted. Otherwise the valve
may be clogged up with dirt and
cause a malfunction or loss of pres-
sure.
. Do not install a damaged or deformed
wheel or tire even if it has been
repaired. Such wheels or tires could
have structural 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
Information” (Canada) in the War- ranty Information Booklet.
Intelligent 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 differ-
ence between tires on the front and
rear axles which will cause excessive
tire wear and may damage the trans-
mission, transfer case and differential
gears.
. ONLY use spare tires specified for
the Intelligent AWD model.
If excessive tire wear is found, it is recom-
mended that all four tires be replaced 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. It is recommended
you visit an INFINITI retailer for this service.
Wheel balance
Unbalanced wheels may affect vehicle hand-
ling and tire life. Even with regular use,
wheels can get out of balance. Therefore,
they should be balanced as required.
Wheel balance service should be performed
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 Booklet.
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) (if so
equipped)
Since the spare tire is not equipped with the
TPMS, when a spare tire is mounted (TEM-
PORARY USE ONLY), the Tire Pressure
Monitoring System (TPMS) will not function.
Observe the following precautions if the
TEMPORARY USE ONLY spare tire must be
used, otherwise your vehicle could be da-
maged or involved in an accident.

WARNING
.The TEMPORARY USE ONLY 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 TEMPOR-
ARY 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 pressure for stan-
dard tires, as indicated on the Tire
and Loading Information label. For
Tire and Loading Information label
location, see “Tire and loading infor-
mation label” (P.10-16).
. 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 appear.
. Do not use the spare tire on other
vehicles.
. Do not use more than one spare tire
at the same time.
CAUTION
.Do not use tire chains on a TEM-
PORARY USE ONLY spare tire. Tire
chains will not fit properly and may
cause damage to the vehicle.
. Because the TEMPORARY USE
ONLY spare tire is smaller than the
original tire, ground clearance is re-
duced. To avoid damage to the
vehicle, do not drive over obstacles.
Also do not drive the vehicle through
an automatic car wash since it may
get caught.
Do-it-yourself8-45

other corrosive materials, check lubrication
frequently.
Lights*:Clean the headlights on a regular
basis. Make sure that the headlights, stop
lights, tail lights, turn signal lights, and other
lights are all operating properly and installed
securely. Also check headlight aim.
Road wheel nuts (lug nuts)*: When checking
the tires, make sure no wheel nuts are
missing, and check for any loose wheel nuts.
Tighten if necessary.
Tire rotation*: Tires should be rotated every
5,000 miles (8,000 km). If your vehicle is
equipped with different sized tires in the
front and rear, tires cannot be rotated.
Tires*: Check the pressure with a gauge
often and always prior to long distance trips.
If necessary, adjust the pressure in all tires,
including the spare, to the pressure speci-
fied. Check carefully for damage, cuts or
excessive wear.
Tire Pressure Monitoring System (TPMS)
transmitter components: Replace the TPMS
transmitter grommet seal, valve core and
cap when the tires are replaced due to wear
or age.
Wheel alignment and balance: If the vehicle
should pull to either side while driving on a
straight and level road, or if you detect
uneven or abnormal tire wear, there may be
a need for wheel alignment. If the steering wheel or seat vibrates at
normal highway speeds, wheel balancing
may be needed.
For additional information regarding tires,
refer to “Important Tire Safety Information”
(US) or “Tire Safety Information” (Canada) in
the INFINITI Warranty Information Booklet.
Windshield:
Clean the windshield on a
regular basis. Check the windshield at least
every six months for cracks or other damage.
Have a damaged windshield repaired by a
qualified repair facility.
Windshield wiper blades*: Check for cracks
or wear if they do not wipe properly.
Inside the vehicle
The maintenance items listed here should be
checked on a regular basis, such as when
performing scheduled maintenance, cleaning
the vehicle, etc.
Accelerator pedal: Check the pedal for
smooth operation and make sure the pedal
does not catch or require uneven effort.
Keep the floor mat away from the pedal.
Automatic transmission P (Park) mechan-
ism: On a fairly steep hill, check that your
vehicle is held securely with the shift lever in
the P (Park) position without applying any
brakes.
Brake pedal: Check the pedal for smooth
operation. If the brake pedal suddenly goes down further than normal, the pedal feels
spongy or the vehicle seems to take longer to
stop, have your vehicle checked immediately.
It is recommended you visit an INFINITI
retailer for this service. Keep the floor mat
away from the pedal.
Brakes:
Check that the brakes do not pull the
vehicle to one side when applied.
Parking brake: Check the parking brake
operation regularly. The vehicle should be
securely held on a fairly steep hill with only
the parking brake applied. If the parking
brake needs adjusted, it is recommended you
visit an INFINITI retailer for this service.
Seats: Check seat position controls such as
seat adjusters, seatback recliner, etc. to
ensure they operate smoothly and that all
latches lock securely in every position. Check
that the head restraints move up and down
smoothly and that the locks (if so equipped)
hold securely in all latched positions.
Seat belts: Check that all parts of the seat
belt system (for example, buckles, anchors,
adjuster and retractors) operate properly
and smoothly, and are installed securely.
Check the belt webbing for cuts, fraying,
wear or damage.
Steering wheel: Check for changes in the
steering conditions, such as excessive free
play, hard steering or strange noises.
Maintenance and schedules9-3

10-12Technical and consumer information
WHEELS AND TIRES
Road wheel
TypeSize Offset in (mm)
Conventional 17 × 7.5J
1.77 (45)
18 × 7.5J 1.77 (45)
19 × 8.5J 1.97 (50)
19 × 9J 1.85 (47)
19 × 9.5J 1.97 (50)
Spare (if so equipped) 18 × 4T 0 (0)
Tire
TypeSize Pressure PSI (kPa) [Cold]
Conventional P225/55RF17 95V
35 (240)
P225/50RF18 94V
P245/40RF19 94V
245/40RF19 94W
Front: 245/40R19 94Y
Rear: 265/35R19 94W
Front: 245/40RF19 94W
Rear: 265/35RF19 94W
Spare (T-type) (if so equipped) T145/70R18 107M 60 (420)

T
Tachometer ............................................................. 2-8
Temperature gaugeEngine coolant temperature gauge ............ 2-8
Theft (INFINITI Vehicle Immobilizer System)
Engine start ..................................................... 2-31
Thigh extension ....................................................... 1-5
Three-way catalyst ................................................ 5-5
Tilt/telescopic steering ...................................... 3-28
Tire Flat Tire - Visit dealer warning ................. 2-22
Run-flat tires .................................................... 6-4
Tire replacement indicator .......................... 2-25
Tire rotation .................................................... 8-41
Tire pressure
Low tire pressure warning light ................ 2-12
Tire Pressure Low - Add Air warning ........... 2-22
Tires
Flat tire ............................................................... 6-3
Low tire pressure
warning system ........................... 5-5, 6-3, 8-32
Run-flat tires .................................................. 8-39
Spare tire ........................................................ 8-44
Tire and Loading
information label ............................. 8-34, 10-16
Tire chains ....................................................... 8-40
Tire dressing ...................................................... 7-4
Tire pressure ................................................... 8-32
Tire Pressure Monitoring
System (TPMS) ........................... 5-5, 6-3, 8-32 Types of tires ................................................. 8-38
Uniform tire quality grading .................... 10-22
Wheel/tire size ............................................ 10-12
Wheels and tires ............................................ 8-32
Towing Flat towing ................................................... 10-22
Tow truck towing .......................................... 6-17
Towing a trailer ........................................... 10-22
TPMS Tire Pressure
Monitoring System .................... 5-5, 6-3, 8-32
TPMS, Tire pressure monitoring system TPMS with Tire Inflation Indicator ............ 5-8
Trailer towing .................................................... 10-22
Transceiver HomeLink® Universal Transceiver ........... 2-58
Transmission Automatic Transmission Fluid (ATF) ....... 8-13
Driving with automatic transmission ....... 5-16
Transmission shift lever lock release ....... 5-19
Transmitter (See remote keyless
entry system) ........................................................ 3-16
Traveling or registering in
another country ................................................ 10-14
Trip computer ....................................................... 2-27
Trip odometer ....................................................... 2-27
Trunk Interior trunk lid release .............................. 3-25
Light .................................................................. 2-57
Pass-through ..................................................... 1-7
Trunk hooks ................................................... 2-50 Trunk lid ........................................................... 3-23
Trunk lid release switch ............................... 3-24
Trunk open request switch ......................... 3-24
Trunk release power cancel switch .......... 3-25
Turn signal switch ............................................... 2-41
U
Underbody cleaning ............................................... 7-3
Uniform tire quality grading .......................... 10-22
V
Vanity mirror ......................................................... 3-32
Vanity mirror lights ............................................. 2-57
Variable voltage control system ..................... 8-19
Vehicle Dimensions ................................................... 10-13
Recovery (freeing a stuck vehicle) ............ 6-19
Vehicle Dynamic Control (VDC)
off switch ......................................................... 2-42
Vehicle dynamic control
(VDC) system ................................................ 5-132
Vehicle Dynamic Control (VDC)
warning light ................................................... 2-15
Vehicle identification number (VIN) ............ 10-14
Vehicle information display .............................. 2-19
Vehicle loading information ............................ 10-19
Vehicle security system ...................................... 2-30
Vehicle speedAverage speed ............................ 2-27
Ventilators ............................................................... 4-2
11-7

11-8
W
WarningFlat Tire - Visit dealer warning ................. 2-22
Hazard warning flasher switch .................... 6-2
Indicators for operation (vehicle
information display) ...................................... 2-21
Lights ................................................................ 2-10
Power steering warning light ..................... 2-14
Predictive Forward Collision
Warning (PFCW) ......................................... 5-112
Tire Pressure Monitoring
System (TPMS) ........................... 5-5, 6-3, 8-32
Vehicle information display ........................ 2-19
Warning lights, indicator lights and
audible reminders .......................................... 2-10
Warning labels Air bag warning labels ................................. 1-59
Warning light
Air bag warning light ........................ 1-59, 2-15
Anti-lock braking system (ABS)
warning light ................................................... 2-10
Brake warning light ....................................... 2-11
Forward Emergency Braking (FEB)
system warning light .................................... 2-11
Low fuel warning light ................................. 2-12
Low tire pressure warning light ................ 2-12
Seat belt warning light and chime ............ 2-15
Warranty Emission control system warranty ........ 10-23 Washer switch
Wiper and washer switch ........................... 2-33
Washing .................................................................... 7-2
Waxing ....................................................................... 7-2
Welcome light and farewell light function .... 3-11
Wheel/tire size ................................................... 10-12
Wheels and tires .................................................. 8-32
Care of wheels .................................................. 7-3
Cleaning aluminum alloy wheels .................. 7-3
Cleaning bright wheels .................................. 7-4
Window washer fluid ......................................... 8-15
Window(s) Cleaning ............................................................... 7-3
Power windows ............................................ 2-50
Wiper Rain-sensing auto wiper system ............... 2-34
Wiper and washer switch ........................... 2-33
Wiper blades ................................................... 8-21
Wiper and washer switch ................................. 2-33