tire type INFINITI Q50 HYBRID 2018 User Guide

8-34Do-it-yourself
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 origin-
ally 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
Information” (Canada) in the War-
ranty Information 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. Sum-
mer 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 thesame 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 prohibit 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.
Run-flat tires
Your vehicle is equipped with run-flat tires.
You can continue driving to a safe location
even if they are punctured. Always use run-
flat tires of the specified size on all four
wheels. Mixing tire sizes or construction may
reduce vehicle handling stability. If neces-
sary, contact an INFINITI retailer for assis-
tance.
Frequently check the tire pressure and adjust
pressure of each tire properly. The tire
pressure can be also checked in the vehicle
information display.
It can be difficult to tell if a run-flat tire is
under-inflated or flat. Check the tire pres-
sures as described earlier in this section. If
the tire becomes under-inflated while driv-
ing, the low tire pressure warning light will
illuminate. If the tire becomes flat while
driving, the low tire pressure warning light

8-36Do-it-yourself
“S” chains are used on vehicles with re-
stricted 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
accommodate 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
recommended by the tire chain manufac-
turer 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
and performance may be adversely affected.
Tire chains must be installed only on the
rear wheels and not on the front wheels.
Never install tire chains on a punctured run-
flat tire, as this could damage your vehicle.
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
INFINITI recommends rotating the
tires every 5,000 miles (8,000 km).
(See “Jacking up the vehicle and
replacing tires” (P.8-39) 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 specification 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.).
. For additional information re-
garding tires, refer to “Impor-
tant Tire Safety Information”
(US) or “Tire Safety Informa-
tion” (Canada) in the Warranty
Information Booklet.
After the ignition switch is placed in
the ON position, it may take a period
of time for the tire pressure to be
displayed in the vehicle information
display while the vehicle is driven.
Depending on the radio wave circum-

stance, tire pressure may not cor-
rectly be displayed.
SDI1663
: Wear indicator
: Wear indicator location mark. The
locations are shown by “”, “TWI”,
etc. depending on tire types.
Tire wear and damage
WARNING
. Tires should be periodically in-
spected for wear, cracking, bul-
ging or objects caught in the
tread. If excessive wear, cracks,
bulging or deep cuts are found,
the tire(s) should be replaced. .
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.
. For additional information re-
garding tires, refer to “Impor-
tant Tire Safety Information”
(US) or “Tire Safety Informa-
tion” (Canada) in the Warranty
Information Booklet.
Replacing wheels and tires
When replacing a tire, use the same size,
tread design, speed rating and load carrying
capacity as originally equipped. (See “Speci-
fications” (P.10-8) for recommended types
and sizes of tires and wheels.)
After the ignition switch is placed in the ON
position, it may take a period of time for the
Do-it-yourself8-37

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 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.
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.
JACKING UP THE VEHICLE AND
REPLACING TIRES
Your vehicle is equipped with run-flat tires
and you can continue driving to a safe
location even if they are punctured. (See
“Run-flat tires” (P.6-4) and “Run-flat tires”
(P.8-34).)
This section contains the information about
the vehicle jack-up procedures and the tire
replacement.
NOTE:
Jacking tools are not equipped as standard
with this vehicle. Contact an INFINITI
retailer about acquiring the tools.
WARNING
.
Make sure the parking brake is
securely applied and the transmission
into the P (Park) position.
. Never change tires when the vehicle
is on a slope, ice or slippery areas.
This is hazardous.
. Never change tires if oncoming traf-
fic is close to your vehicle. Wait for
professional road assistance.
Do-it-yourself8-39

WHEELS AND TIRES
Road wheel
TypeSize Offset in (mm)
Conventional 19 × 8.5J 1.97 (50)
Tire
TypeSize Pressure PSI (kPa) [Cold]
Conventional P245/40RF19 94V
35 (240)
245/40RF19 94W
DIMENSIONS
in (mm)
Overall length (with front license plate) 189.6 (4,815)
Overall length (without front license plate) 189.1 (4,803)
Overall width 71.8 (1,824)
Overall height 56.8 (1,443)*1
57.2 (1,453)*2
Front tread 60.4 (1,534)
Rear tread 61.4 (1,560)
Wheelbase 112.2 (2,850)
*1: Two-Wheel Drive (2WD) models
*2: All-Wheel Drive (AWD) models
Technical and consumer information10-9

11-6
Cruise control ................................................. 5-70
Maintenance ..................................................... 8-2
Seat belt usage ................................................. 1-9
Supplemental restraint system .................. 1-37
When starting and driving ............................ 5-4
Pre-crash seat belts with
comfort function ................................................... 1-11
Predictive Forward Collision
Warning (PFCW) ............................................... 5-112
Push starting ............................................................ 6-7
Push-button ignition switch .................. 5-11, 5-12
R
Radio Car phone or CB radio ................................... 4-3
Rain-sensing auto wiper system ..................... 2-35
Rapid air pressure loss .......................................... 5-9
Readiness for inspection/maintenance
(I/M) test (US only) ........................................... 10-21
Rear door lock Child safety rear door lock ........................... 3-6
Rear window and outside mirror
defroster switch ................................................... 2-36
Recorders Event data .................................................... 10-21
Regenerative brake ...................... Hybrid System-8
Registering in another country ..................... 10-10
Remote engine start ........................................... 3-19
Remote keyless entry system .......................... 3-15
Reporting safety defects ................................ 10-20 Request switch (See Intelligent
Key system) .............................................................. 3-9
Road accident cautions .............. Hybrid System-3
Roadside assistance program ............................. 6-2
Rollover ..................................................................... 5-9
Roof
Moonroof ......................................................... 2-55
Run-flat tires .......................................................... 6-4
S
Safety Child seat belts ............................................... 1-16
Reporting safety defects .......................... 10-20
Seat adjustment Front power seat adjustment ....................... 1-3
Front seats ......................................................... 1-3
Seat belt(s) Child safety ..................................................... 1-16
Infants ............................................................... 1-16
Injured persons ................................................ 1-11
Larger children ............................................... 1-17
Precautions on seat belt usage .................... 1-9
Pre-crash seat belts with
comfort function ............................................. 1-11
Pregnant women ............................................ 1-11
Seat belt cleaning ............................................. 7-7
Seat belt extenders ....................................... 1-15
Seat belt maintenance ................................. 1-15
Seat belt warning light and chime ............ 2-14
Seat belts ............................................................ 1-9
Seat belts with pretensioners .................... 1-53 Shoulder belt height adjustment ............... 1-14
Small children .................................................. 1-17
Three-point type ............................................ 1-12
Seat(s)
Driver-side memory ..................................... 3-30
Heated seats .................................................. 2-44
Seats .................................................................... 1-2
Security system Vehicle security system ................................ 2-31
Security system (INFINITI Vehicle
Immobilizer System) Engine start ..................................................... 2-32
Shift lever
Shift lock release ........................................... 5-18
Shift lock release, Transmission ...................... 5-18
SHIFT “P” warning .............................................. 2-20
Shifting Automatic transmission ............................... 5-15
Shoulder belt height adjustment ..................... 1-14
SNOW mode ......................................................... 5-21
Spark plugs ............................................................ 8-15
Speedometer ............................................................ 2-6
SPORT mode ........................................................ 5-21
Standard maintenance .......................................... 9-7
STANDARD mode ............................................... 5-21
Starting
Before starting the INFINITI Direct
Response Hybrid
®System .......................... 5-14
Jump starting .................................................. 8-15
Precautions when starting and driving ..... 5-4
Push starting ...................................................... 6-7

Starting the INFINITI Direct Response
Hybrid®System .............................................. 5-14
Status light, Front passenger air bag ............ 1-45
Steering
Direct Adaptive Steering ........................... 5-126
Heated steering wheel ................................. 2-45
Power steering system .............................. 5-126
Tilt/telescopic steering ................................ 3-27
Storage ................................................................... 2-47
Storage box ........................................................... 2-50
Sun visors ............................................................... 3-27
Sunglasses holder ................................................ 2-49
Supplemental air bag warning labels ............. 1-54
Supplemental air bag warning light ... 1-54, 2-14
Supplemental restraint system ........................ 1-37 Precautions on supplemental
restraint system ............................................. 1-37
Switch Autolight switch ............................................. 2-37
Fog light switch ............................................. 2-43
Hazard warning flasher switch .................... 6-2
Headlight switch ............................................ 2-36
Ignition switch ................................................ 5-15
Power door lock switch ................................. 3-5
Rear window and outside mirror
defroster switch ............................................. 2-36
Turn signal switch ......................................... 2-42
Vehicle Dynamic Control (VDC)
off switch ......................................................... 2-43T
Tachometer .............................................................. 2-7
Temperature Engine coolant temperature gauge .......... 2-29
Theft (INFINITI Vehicle Immobilizer System)
Engine start ..................................................... 2-32
Three-way catalyst ................................................ 5-5
Tilt/telescopic steering ...................................... 3-27
Tire Flat Tire - Visit dealer warning ................. 2-22
Run-flat tires .................................................... 6-4
Tire replacement indicator .......................... 2-25
Tire rotation .................................................... 8-36
Tire pressure
Low tire pressure warning light ................ 2-12
Tire Pressure Low - Add Air warning ........... 2-21
Tires Flat tire ............................................................... 6-3
Low tire pressure
warning system ........................... 5-5, 6-3, 8-28
Run-flat tires ................................................. 8-34
Tire and Loading
information label ............................. 8-30, 10-12
Tire chains ........................................................ 8-35
Tire dressing ...................................................... 7-4
Tire pressure .................................................. 8-28
Tire Pressure Monitoring
System (TPMS) ........................... 5-5, 6-3, 8-28
Types of tires ................................................. 8-34
Uniform tire quality grading .................... 10-18 Wheel/tire size ............................................... 10-9
Wheels and tires ........................................... 8-28
Towing
Flat towing ................................................... 10-18
Tow truck towing ............................................ 6-9
Towing a trailer ........................................... 10-18
TPMS
Tire Pressure
Monitoring System .................... 5-5, 6-3, 8-28
TPMS with Tire Inflation Indicator ............ 5-8
Trailer towing .................................................... 10-18
Transceiver HomeLink
®Universal Transceiver ............ 2-59
Transmission Automatic Transmission Fluid (ATF) ....... 8-12
Driving with automatic transmission ....... 5-15
Transmission shift lever lock release ....... 5-18
Transmitter (See remote keyless
entry system) ........................................................ 3-15
Traveling or registering in
another country ................................................ 10-10
Trip computer ....................................................... 2-27
Trip odometer ....................................................... 2-29
Trunk Interior trunk lid release .............................. 3-24
Light .................................................................. 2-58
Trunk hooks .................................................... 2-51
Trunk lid ........................................................... 3-22
Trunk lid release switch ............................... 3-22
Trunk open request switch ......................... 3-22
Trunk release power cancel switch .......... 3-23
11-7