height INFINITI Q50 2018 User Guide

8-36Do-it-yourself
REAR
ORIGI- NAL
TIRE P225/55R-
F17 95V
240 kPa,
35 PSI
P225/50R-
F18 94V 240 kPa,
35 PSI
P245/40R-
F19 94V 240 kPa,
35 PSI
245/40RF19
94W 240 kPa,
35 PSI
265/35R19
94W 240 kPa,
35 PSI
265/35RF19
94W 240 kPa,
35 PSI
SPARE
TIRE (if
so
equip- ped) T145/70R18
107M
420 kPa,
60 PSI
SDI1575
Example
TIRE LABELING
Federal law requires tire manufac-
turers to place standardized informa-
tion on the sidewall of all tires. This
information identifies and describes
the fundamental characteristics of
the tire and also provides the tire
identification number (TIN) for safety
standard certification. The TIN can be
used to identify the tire in case of a
recall.
SDI1606
ExampleTire size (example: P215/60R16
94H)
1. P: The “P” indicates the tire is designed for passenger vehicles.
(Not all tires have this informa-
tion.)
2. Three-digit number (215): This number gives the width in milli-
meters of the tire from sidewall
edge to sidewall edge.
3. Two-digit number (60): This num- ber, known as the aspect ratio,
gives the tire’s ratio of height to

.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 perso-
nal injury. If it is necessary to
repair the spare tire, it is re-
commended you visit an
INFINITI retailer for this ser-
vice.
. 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.10-11) 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
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 correctly be
displayed.
WARNING
. The use of tires other than those
recommended or the mixed use of
tires of different brands, construc-
tion (bias, bias-belted, radial or run-
flat), or tread patterns can adversely
affect the ride, braking, handling,
ground clearance, body-to-tire clear-
ance, 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.
. For Two-Wheel Drive (2WD) models,
if your vehicle was originally equipped with 4 tires that were the
same size and you are only replacing
2 of the 4 tires, install the new tires
on the rear axle. Placing new tires on
the front axle may cause loss of
vehicle control in some driving condi-
tions and cause an accident and
personal injury.
. If the wheels are changed for any
reason, always replace with wheels
which have the same off-set dimen-
sion. Wheels of a different off-set
could cause premature tire wear,
degrade vehicle handling character-
istics and/or interference with the
brake discs/drums. Such interference
can lead to decreased braking effi-
ciency and/or early brake pad/shoe
wear. See “Wheels and tires” (P.10-
12) of this manual for wheel off-set
dimensions.
. Since the spare tire is not equipped
with the TPMS, 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. Have
your tires replaced and/or TPMS
system reset as soon as possible. It
is recommended you visit an INFINITI
retailer for these services.
Do-it-yourself8-43

DIMENSIONS
in (mm)
Base/Premium Sport
Overall length (with front license plate) 189.6 (4,815)189.6 (4,815)
Overall length (without front license plate) 189.1 (4,803) 189.1 (4,803)
Overall width 71.8 (1,824)71.8 (1,824)
Overall height 56.8 (1,443)*1
57.2 (1,453)*2,*3 56.8 (1,443)*1
57.2 (1,453)*2,*3
Front tread 60.8 (1,544)*4
60.4 (1,534)*5 60.8 (1,544)*6
60.6 (1,539)*7
60.4 (1,534)*5
Rear tread 61.8 (1,570)*9
61.6 (1,565)*8
61.4 (1,560)*5 61.6 (1,565)*6
61.4 (1,560)*7,*10 61.2 (1,555)*8
Wheelbase 112.2 (2,850)112.2 (2,850)
*1: Two-Wheel Drive (2WD) models with VR30DDTT engine
*2: Two-Wheel Drive (2WD) models with 2.0L turbo gasoline engine
*3: Intelligent All-Wheel Drive (AWD) models
*4: 17 × 7.5J and 18 × 7.5J wheel models
*5: 19 × 8.5J wheel models
*6: 19 × 9J wheel models
*7: 19 × 9J wheel (front) /19 × 9.5J wheel (rear) models
*8: 2.0L turbo gasoline engine models
*9: 17 × 7.5J and 18 × 7.5J wheel models with VR30DDTT engine
*10: 19 × 8.5J wheel models with VR30DDTT engine
Technical and consumer information10-13

11-6
Request switch (See Intelligent
Key system) ........................................................... 3-10
Roadside assistance program ............................. 6-2
Rollover ..................................................................... 5-9
RoofMoonroof ......................................................... 2-53
Run-flat tires .......................................................... 6-4
S
Safety Child seat belts ............................................... 1-21
Reporting safety defects .......................... 10-24
Seat adjustment Front power seat adjustment ....................... 1-3
Front seats ......................................................... 1-3
Seat belt(s) Child safety ..................................................... 1-21
Infants ............................................................... 1-22
Injured persons ............................................... 1-14
Larger children ............................................... 1-22
Precautions on seat belt usage ................. 1-12
Pre-crash seat belts with
comfort function ............................................ 1-14
Pregnant women ........................................... 1-14
Seat belt cleaning ............................................. 7-7
Seat belt extenders ....................................... 1-20
Seat belt maintenance ................................. 1-20
Seat belt warning light and chime ............ 2-15
Seat belts ......................................................... 1-12
Seat belts with pretensioners .................... 1-58
Shoulder belt height adjustment ............... 1-20 Small children .................................................. 1-22
Three-point type ............................................ 1-15
Seat(s) Driver-side memory ...................................... 3-33
Heated seats ................................................... 2-43
Seats .................................................................... 1-2
Security system
Vehicle security system ............................... 2-30
Security system (INFINITI Vehicle
Immobilizer System)
Engine start ..................................................... 2-31
Shift lever
Shift lock release ........................................... 5-19
Shift lock release, Transmission ...................... 5-19
Shifting
Automatic transmission ............................... 5-16
Shoulder belt height adjustment ..................... 1-20
SNOW mode ......................................................... 5-23
Spare tire ............................................................. 10-12
Spark plugs ............................................................ 8-20
Speedometer ............................................................ 2-7
SPORT mode ........................................................ 5-23
SPORT+ mode ...................................................... 5-23
Standard maintenance .......................................... 9-7
STANDARD mode ............................................... 5-22
Starting Before starting the engine .......................... 5-14
Jump starting .................................................. 8-18
Precautions when starting and driving ..... 5-4
Push starting ................................................... 6-16
Starting the engine ....................................... 5-15 Status light, Front passenger air bag ............ 1-50
Steering
Direct Adaptive Steering .......................... 5-128
Heated steering wheel ................................ 2-44
Power steering fluid ..................................... 8-14
Power steering system .............................. 5-127
Tilt/telescopic steering ................................ 3-28
Storage ................................................................... 2-46
Storage box ........................................................... 2-49
Sun visors ............................................................... 3-30
Sunglasses holder ................................................ 2-47
Supplemental air bag warning labels ............. 1-59
Supplemental air bag warning light .... 1-59, 2-15
Supplemental restraint system ........................ 1-42 Precautions on supplemental
restraint system ............................................. 1-42
Switch Autolight switch ............................................. 2-36
Fog light switch ............................................. 2-42
Hazard warning flasher switch .................... 6-2
Headlight switch ............................................ 2-35
Ignition switch ................................................ 5-16
Power door lock switch ................................. 3-5
Rear window and outside mirror
defroster switch ............................................. 2-35
Turn signal switch ......................................... 2-41
Vehicle Dynamic Control (VDC)
off switch ......................................................... 2-42