2021 LEXUS RX450h wheel size

3896-3. Do-it-yourself maintenance
6
Maintenance and care
When replacing wheels, care should
be taken to ensure that they are equiv-
alent to those removed in load capac-
ity, diameter, rim width and inset
*.
Replacement wheels are available at
your Lexus dealer.
*: Conventionally referred to as offset.
Lexus does not recommend using the
following:
 Wheels of different sizes or types
 Used wheels
 Bent wheels that have been straight-
ened
■When replacing wheels
The wheels of your vehicle are equipped
with tire pressure warning valves and trans-
mitters that allow the tire pressure warning
system to provide advance warning in the
event of a loss in tire inflation pressure.
Whenever wheels are replaced, tire pres-
sure warning valves an d transmitters must
be installed. ( P.384) Use only Lexus wheel nuts and
wrenches designed for use with
your aluminum wheels.
 When rotating, repairing or chang-
ing your tires, check that the wheel
nuts are still tight after driving 1000
miles (1600 km).
 Be careful not to damage the alumi-
num wheels when using tire chains.
 Use only Lexus genuine balance
weights or equivalent and a plastic
or rubber hammer when balancing
your wheels.
Wheels
If a wheel is bent, cracked or heavily
corroded, it should be replaced.
Otherwise, the tire may separate
from the wheel or cause a loss of
handling control.
Wheel selection
WARNING
■When replacing wheels
●Do not use wheels that are a different
size from those recommended in the
Owner’s Manual, as this may result in a
loss of handling control.
●Never use an inner tube in a leaking
wheel which is designed for a tubeless
tire.
Doing so may result in an accident,
causing death or serious injury.
■Use of defective wheels prohibited
Do not use cracked or deformed wheels.
Doing so could cause the tire to leak air
during driving, possibly causing an acci-
dent.
NOTICE
■Replacing tire pressure warning
valves and transmitters
●Because tire repair or replacement
may affect the tire pressure warning
valves and transmitters, make sure to
have tires serviced by your Lexus
dealer or other qua lified service shop.
In addition, make sure to purchase
your tire pressure warning valves and
transmitters at your Lexus dealer.
●Ensure that only genuine Lexus wheels
are used on your vehicle.
Tire pressure warning valves and trans-
mitters may not work properly with
non-genuine wheels.
Aluminum wheel precautions

4277-2. Steps to take in an emergency
7
When trouble arises
WARNING
■If a blowout or sudden air leakage
should occur
The tire pressure warning system may
not activate immediately.
■Maintenance of the tires
Each tire, including the spare (if pro-
vided), should be checked monthly when
cold and inflated to the inflation pressure
recommended by the vehicle manufac-
turer on the vehicle placard or tire infla-
tion pressure label (tire and load
information label). (I f your vehicle has
tires of a different size than the size indi-
cated on the vehicle placard or tire infla-
tion pressure label [tire and load
information label], yo u should determine
the proper tire infl ation pressure for
those tires.)
As an added safety feature, your vehicle
has been equipped with a tire pressure
monitoring system (TPMS-tire pressure
warning system) that illuminates a low
tire pressure telltale (tire pressure warn-
ing light) when one or more of your tires
is significantly under-inflated. Accord-
ingly, when the low tire pressure telltale
(tire pressure warnin g light) illuminates,
you should stop and check your tires as
soon as possible, and inflate them to the
proper pressure. Driving on a signifi-
cantly under-inflated tire causes the tire
to overheat and can lead to tire failure.
Under-inflation also reduces fuel effi-
ciency and tire tread life, and may affect
the vehicle’s handling and stopping abil-
ity.
Please note that the TPMS (tire pressure
warning system) is not a substitute for
proper tire maintenance, and it is the
driver’s responsibility to maintain correct
tire pressure, even if under-inflation has
not reached the level to trigger illumina-
tion of the TPMS low tire pressure telltale
(tire pressure warning light).
Your vehicle has also been equipped with
a TPMS (tire pressure warning system)
malfunction indicator to indicate when
the system is not operating properly. The
TPMS (tire pressure warning system)
malfunction indicator is combined with
the low tire pressure telltale (tire pres-
sure warning light) . When the system
detects a malfunction, the telltale will
flash for approximately one minute and
then remain continuously illuminated.
This sequence will continue upon subse-
quent vehicle start-ups as long as the
malfunction exists. When the malfunction
indicator is illuminated, the system may
not be able to detect or signal low tire
pressure as intended.
TPMS (tire pressure warning system)
malfunctions may occur for a variety of
reasons, including the installation of
replacement or alternate tires or wheels
on the vehicle that prevent the TPMS
(tire pressure warning system) from func-
tioning properly. Always check the
TPMS (tire pressure warning system)
malfunction telltale after replacing one
or more tires or wheels on your vehicle to
ensure that the replacement or alternate
tires and wheels allow the TPMS (tire
pressure warning system) to continue to
function properly.
NOTICE
■To ensure the tire pressure warning
system operates properly
Do not install tires with different specifi-
cations or makers, as the tire pressure
warning system may not operate prop-
erly.

4668-1. Specifications
*: Minimum pedal clearance when depressed with a force of 110 lbf (490 N, 50 kgf) while
the hybrid system is operating.
Type A
Brake pad wear limit0.04 in. (1.0 mm)
Fluid typeFMVSS No. 116 DOT 3 or SAE J1703
FMVSS No. 116 DOT 4 or SAE J1704
Steering
Free playLess than 1.2 in. (30 mm)
Tires and wheels
Tire size235/65R18 106V, T165/90D18 107M (spare)
Tire inflation pressure
(Recommended cold tire
inflation pressure)
Front tire
33 psi (230 kPa, 2.3 kgf/cm
2 or bar)
Rear tire
33 psi (230 kPa, 2.3 kgf/cm
2 or bar)
Spare tire
60 psi (420 kPa, 4.2 kgf/cm
2 or bar)
Driving at high speeds (above 100 mph [160 km/h]) (in
countries where such speeds are permitted by law)
Add 5 psi (30 kPa, 0.3 kgf/cm
2 or bar) to the front and rear
tires. Never exceed the maximum cold tire inflation pres-
sure indicated on the tire sidewall.
Wheel size18  8J, 18  4T (spare)
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

4678-1. Specifications
8
Vehicle specifications
Type B
Tire size235/55R20 102V, T165/90D18 107M (spare)
Tire inflation pressure
(Recommended cold tire
inflation pressure)
RX450h:
Front tire
33 psi (230 kPa, 2.3 kgf/cm
2 or bar)
Rear tire
33 psi (230 kPa, 2.3 kgf/cm
2 or bar)
Spare tire
60 psi (420 kPa, 4.2 kgf/cm
2 or bar)
Driving at high speeds (above 100 mph [160 km/h]) (in
countries where such speeds are permitted by law)
Add 11 psi (70 kPa, 0.7 kgf/cm
2 or bar) to the front and rear
tires. Never exceed the maximum cold tire inflation pres-
sure indicated on the tire sidewall.
RX450hL:
Front tire
35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Rear tire
35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Spare tire
60 psi (420 kPa, 4.2 kgf/cm
2 or bar)
Driving at high speeds (above 100 mph [160 km/h]) (in
countries where such speeds are permitted by law)
Add 9 psi (62 kPa, 0.6 kgf/cm
2 or bar) to the front and rear
tires. Never exceed the maximum cold tire inflation pres-
sure indicated on the tire sidewall.
Wheel size20  8J, 18  4T (spare)
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

4738-1. Specifications
8
Vehicle specifications
Vehicle Safety Standards.
■Typical tire size information
The illustration indicates typical tire
size.
Tire use (P = Passenger car, T =
Temporary use)
Section width (millimeters)
Aspect ratio (tire height to section
width)
Tire construction code (R = Radial,
D = Diagonal)
Wheel diameter (inches)
Load index (2 digits or 3 digits)
Speed symbol (alphabet with one
letter)
■Tire dimensionsSection width Tire height
Wheel diameter
Bead
Sidewall
Shoulder
Tread
Belt
Inner liner
Reinforcing rubber
Carcass
Rim lines
Bead wires
Chafer
This information has been prepared in
accordance with regulations issued by
the National Highway Traffic Safety
Administration of the U.S. Department
of Transportation.
It provides the purchasers and/or pro-
spective purchasers of Lexus vehicles
with information on uniform tire quality
grading.
Tire size
A
B
C
D
E
F
G
A
Tire section names
Uniform Tire Quality Grading
B
C
A
B
C
D
E
F
G
H
I
J
K

4768-1. Specifications
RimA metal support for a tire or a tire and tube assem-
bly upon which the tire beads are seated
Rim diameter (Wheel diameter)Nominal diameter of the bead seat
Rim size designationRim diameter and width
Rim type designationThe industry manufacturer’s designation for a rim
by style or code
Rim widthNominal distance between rim flanges
Vehicle capacity weight (Total load
capacity)The rated cargo and luggage load plus 150 lb. (68
kg) times the vehicle’s designated seating capacity
Vehicle maximum load on the tire
The load on an individual tire that is determined by
distributing to each axle its share of the maximum
loaded vehicle weight, and dividing by two
Vehicle normal load on the tire
The load on an individual ti re that is determined by
distributing to each axle its share of curb weight,
accessory weight, and normal occupant weight
(distributed in accor dance with Table 1
* below), and
dividing by two
Weather sideThe surface area of the rim not covered by the
inflated tire
Bead
The part of the tire that is made of steel wires,
wrapped or reinforced by ply cords and that is
shaped to fit the rim
Bead separationA breakdown of the bond between components in
the bead
Bias ply tire
A pneumatic tire in which the ply cords that extend
to the beads are laid at alternate angles substan-
tially less than 90 degrees to the centerline of the
tread
CarcassThe tire structure, except tread and sidewall rubber
which, when inflated, bears the load
ChunkingThe breaking away of pieces of the tread or sidewall
CordThe strands forming the plies in the tire
Cord separationThe parting of cords from adjacent rubber com-
pounds
Tire related termMeaning

523Alphabetical Index
Meter control switches .............................. 89
Power easy access system ..................... 142
Steering wheel position memory ........ 142
Stop lights Replacing light bulbs............................... 400
Storage features .......................................... 324
Stuck If the vehicle becomes stuck................ 457
Suggestion function....................................... 93
Sun visors ........................................................ 344
Sunshade Panoramic moon roof.............................. 158
Roof ................................................................... 156
Switches Automatic High Beam switch ............. 203
Brake Hold switch ..................................... 198
Door lock switches ........................................ 111
Driving mode select switch ....................281
Driving position memory switches ..... 142
Dynamic radar cruise control with full-speed range switch ....................... 238
Electronic sunshade switch ................... 158
Emergency flashers switch .................... 410
EV drive mode switch ............................. 189
Fog light switch ...........................................206
Garage door opener switches .......... 346
Heated steering wheel switch.............. 318
HUD (Head-up display) switch............ 96
Ignition switch............................................... 184
Instrument panel light control switches ............................................................................ 87
Intuitive parking assist switch............... 256
Light switches ..............................................200
LTA (Lane Tracing Assist) switch....... 231
Meter control switches .............................. 89
Moon roof switches .................................. 155
“ODO TRIP” switch .................................... 87
Outside rear view mirror switches .... 150
Paddle shift switches ....................... 192, 193
Panoramic moon roof switches .......... 158
Parking brake switch ................................ 195
PCS OFF switch .........................................222 PKSB (Parking Support Brake) switch
..........................................................................266
Power switch................................................. 184
Power window switches ......................... 153
RCTA switch ..................................................261
Rear window and outside rear view mir- ror defoggers switch ........................... 304
Seat heater switches.................................. 318
Seat ventilator switches ........................... 318
“SOS” button...................................................60
Tilt and telescopic steering control switch ........................................................................... 148
Tire pressure warning reset switch.. 385
Vehicle-to-vehicle distance switch...238
VSC OFF switch ...................................... 285
Window lock switch.................................. 155
Windshield wiper and washer switch ......................................................................... 206
Windshield wiper de-icer switch...... 309
T
Tachometer....................................................... 83 Rev indicator ...................................................85
Rev peak............................................................85
Tail lights Light switch .................................................. 200
Replacing light bulbs ............................... 400
The Secondary Collision Brake ............ 284
Theft deterrent system Alarm................................................................... 75
Immobilizer system ...................................... 73
Tire inflation pressure Maintenance data ......................................466
Tire inflation pressure display function..........................................................................382
Warning light ............................................... 422
Tire information .............................................. 471 Glossary ......................................................... 475
Size .................................................................... 473
Tire identification number...................... 472
Uniform Tire Quality Grading ............ 473
Tire pressure display ... ............................... 382

524Alphabetical Index
Tire pressure warning systemFunction .......................................................... 382
Initializing ...................................................... 385
Installing tire pressure warning valves and transmitters ......................................384
Registering ID codes ............................... 387
Warning light ............................................... 422
Tires Chains ............................................................. 292
Checking ...................................................... 380
If you have a flat tire .................................. 432
Inflation pressure........................................ 387
Information ...................................................... 471
Replacing ....................................................... 432
Rotating tires ................................................ 382
Size.................................................................... 466
Snow tires ........................................................ 291
Spare tire........................................................ 432
Tire inflation pressu re display function
......................................................................... 382
Tire pressure warning system ............. 382
Warning light ............................................... 422
Tools.................................................................. 433
Top tether strap................................................57
Total load capacity ...................................... 460
Towing Dinghy towing .............................................. 183
Emergency towing ..................................... 413
Towing eyelet ................................................415
Trailer towing ................................................. 173
TRAC (Traction Control) ........................ 284
Traction battery (hybrid battery) Hybrid battery (traction battery) air vents.............................................................................. 71
Location............................................................. 69
Specification ................................................. 462
Warning message.........................................72
Traction Control (TRAC) ........................ 284
Traction motor (electric motor) ............... 66
Trailer Sway Control.................................. 284
Trailer towing .................................................. 173 Transmission
Driving mode select switch ................... 281
Hybrid transmission..................................... 191
M mode ........................................................... 193
Paddle shift switches ....................... 192, 193
Trip meters ........................................................ 87
Turn signal lights Replacing light bulbs ............................... 400
Turn signal lever .......................................... 194
Wattage ......................................................... 468
U
USB charging ports.................................... 334
V
Vanity lights.................................................... 345Wattage ......................................................... 468
Vanity mirrors ............................................... 345
VDIM (Vehicle Dynamics Integrated Man- agement)...................................................... 284
Vehicle data recording ....................................7
Vehicle Dynamics Integrated Manage- ment (VDIM).............................................. 284
Vehicle identification number ................ 460
Vehicle Stability Control (VSC) ........... 283
Ventilators (seat ventilators).................... 318
VSC (Vehicle Stability Control) ........... 283
W
Warning buzzers Approach warning.................................... 244
Brake Override System .........................420
Door lock .......................................................... 110
Downshifting ................................................. 193
Drive-Start Control...................................420
Electric power steering.............................421
Hands off steering wheel warning (LTA).......................................................................... 234
High coolant temperature...................... 418
Hybrid system overheat .......................... 419