2007 Lexus GS450h wheel

500
6-1. Specifications
Tire size■ Typical tire size information
The illustration indicates typical
tire size.
Ti r e u s e 
(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 or 3 digits)
Speed symbol 
(alphabet with one letter)
■ Tire dimensions
Section width
Ti r e h e i g h t
Wheel diameter

502
6-1. Specifications
■Treadwear
The treadwear grade is a comparative rating based on the wear rate of
the tire when tested under controll ed conditions on a specified gov-
ernment test course.
For example, a tire graded 150 would wear one and a half (1 - 1 /2) times as
well on the government course as a tire graded 100. 
The relative performance of tires de pends upon the actual conditions of
their use, however, and may depart significantly from the norm due to varia-
tions in driving habits, service practices and differences in road characteris-
tics and climate.
■ Traction AA, A, B, C
The traction grades, from highest to lowest, are AA, A, B and C, and
they represent the tire’s ability to stop on wet pavement as measured
under controlled condit ions on specified government test surfaces of
asphalt and concrete.
A tire marked C may have poor traction performance.
Warning: The traction grade assigned to this tire is based on braking
(straight ahead) traction tests and does not include cornering (turning) trac-
tion.
■ Temperature A, B, C
The temperature grades are A (the highest), B, and C, representing
the tire’s resistance to the generation of heat and its ability to dissipate
heat when tested under controlled conditions on a specified indoor
laboratory test wheel.
Sustained high temperature can cause the material of the tire to degenerate
and reduce tire life, and excessive temperature can lead to sudden tire fail-
ure.
The grade C corresponds to a level of performance which all passenger car
tires must meet under the Federal Mo tor Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of performance on the laboratory
test wheel than the minimum required by law.

504
6-1. Specifications
Tire related termMeaning
Occupant distributionDistribution of occupants in a vehicle as specified in
the third column of Table 1
* below
Production options
weight
The combined weight of installed regular production
options weighing over 5 lb. (2.3 kg) in excess of the
standard items which they replace, not previously
considered in curb weight or accessory weight,
including heavy duty brakes, ride levelers, roof rack,
heavy duty battery, and special trim
RimA metal support for a tire or a tire and tube assembly
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 tireThe 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 tire that is determined by
distributing to each axle its share of curb weight,
accessory weight, and normal occupant weight (dis-
tributed in accordance with Table 1
* below), and
dividing it by two

507
6-1. Specifications
6
Vehicle specifications
Tire related termMeaning
Passenger car tire
A tire intended for use on passenger cars, multipur-
pose passenger vehicles, and trucks, that have a
gross vehicle weight rating (GVWR) of 10,000 lb. or
less
PlyA layer of rubber-coated parallel cords
Ply separationA parting of rubber compound between adjacent
plies
Pneumatic tire
A mechanical device made of rubber, chemicals, fab-
ric and steel or other mate rials, that, when mounted
on an automotive wheel, provides the traction and
contains the gas or fluid that sustains the load
Radial ply tire
A pneumatic tire in which the ply cords that extend to
the beads are laid at substantially 90 degrees to the
centerline of the tread
Reinforced tire
A tire designed to operate at higher loads and at
higher inflation pressures than the corresponding
standard tire
Section width
The linear distance between the exteriors of the side-
walls of an inflated tire, excluding elevations due to
labeling, decoration, or protective bands
SidewallThat portion of a tire between the tread and bead
Sidewall separationThe parting of the rubber compound from the cord
material in the sidewall

508
6-1. Specifications
Tire related termMeaning
Snow tire
A tire that attains a traction index equal to or greater
than 110, compared to the ASTM E-1136 Standard
Reference Test Tire, when using the snow traction test
as described in ASTM F-1805-00, Standard Test
Method for Single Wheel Driving Traction in a
Straight Line on Snow-and Ice-Covered Surfaces,
and which is marked with an Alpine Symbol ( )
on at least one sidewall
Te s t r i mThe rim on which a tire is fitted for testing, and may be
any rim listed as appropriate for use with that tire
Tr e a dThat portion of a tire that comes into contact with the
road
Tr e a d r i bA tread section running circumferentially around a
tire
Tr e a d s e p a r a t i o nPulling away of the tread from the tire carcass
Treadwear indicators
(TWI)The projections within the principal grooves
designed to give a visual indication of the degrees of
wear of the tread
Wheel-holding fixtureThe fixture used to hold the wheel and tire assembly
securely during testing

521
Alphabetical index
Garage door opener.......................... 329
Gas station information ..................... 528
Gauges.........................................................112
Glove box ............................................... 307
Hands-free system ................................ 261
Head restraints......................................... 38
Headlight aim .......................................... 419
Headlight cleaner .................................. 128
HeadlightsAFS (Adaptive Front lighting 
System) ................................................. 123
Discharge headlights 
precautions ....................................... 426
Replacing light bulbs ......................... 421
Switch ........................................................ 122
Wattage ................................................. 494
Heaters Seat heaters..................................319, 321
Side mirror ..............................................199
Hill-start assist control ......................... 164
Hood ......................................................... 366
Hooks Cargo.......................................................327
Shopping bag.......................................327
Hybrid system .................................................. 2
Emergency shut o ff system .................6
Energy monitor/consumption 
screen .........................................................6
High voltage components ...................5
Power meter ............................................ 112
Power switch .........................................103
Hybrid vehicle immobilizer 
system ....................................................... 59 Illuminated entry system ....................303
I/M test...................................................... 362
Indicator lights........................................... 116
Initialization
Items to initialize .................................. 514
Inside rear view mirror .......................... 47
Instrument panel light control ............ 113
Interior lights Interior lights ........................................ 304
Wattage ..................................................494
Intuitive parking assist ............................ 141
Jack Positioning the jack ...........................367
Replacing the wheel .......................... 461
Jack handle............................................... 461
Keys If you lose your keys ......................... 473
Key number plate .................................... 11
Keys ................................................................ 11
Power switch......................................... 103
Mechanical key ......................................... 11
When the electronic key battery 
is discharged..................................... 474
Wireless remote control ................... 22
Lexus Link System ............................... 338
Light bulbs Replacing .................................................421
Wattage ..................................................494
Light sensitive optitron meter............. 114
Lights Fog light switch .................................... 125
Headlights switch................................. 122
Interior lights list ................................. 303G
H
I
J
K
L

523
Alphabetical index
Cleaning and maintaining 
the seat belts..................................... 355
Emergency Locking Retractor  (ELR) ........................................................ 42
How to wear your seat belt............. 40
How your child should wear 
the seat belt...........................................43
Pre-collision seat belts........................ 42
Pregnant women, 
proper seat belt use.......................... 42
Reminder light..................................... 440
Seat belt extenders ...............................43
Seat belt pretensioners........................ 41
Seat heaters.................................... 319, 321
Seat ventilators........................................ 321
Seating capacity ..................................... 175
Seats Child seats/child restraint 
system installation ............................. 85
Cleaning ................................................ 354
Driving position memory ................. 35
Head restraint ........................................ 38
Properly sitting in the seat.................64
Seat adjustment ......................................33
Seat adjustment precautions ...........33
Seat heaters..................................319, 321
Ventilated seats .................................... 321
Service reminder indicators ...............117
Shift lever If the shift lever cannot be 
shifted from P .................................... 472
Transmission ..........................................106
Shift lock system .................................... 472
Shopping bag hooks ............................327
Side airbags ................................................66
Side marker lights Switch ........................................................ 122 Side mirror
Adjusting and folding..........................48
Driving position memory ..................35
Smart access system with 
push-button start Antenna location .....................................15
Entry function ............................................13
Starting the hybrid system .............. 103
Spare tire Inflation pressure ................................493
Spare tire ................................................ 462
Spark plug................................................490
Specifications .........................................486
Speedometer ............................................ 112
Steering wheel Adjustment ............................................... 46
Audio switches....................................259
Driving position memory ..................35
Storage compartment ........................309
Storage feature......................................306
Stuck If your vehicle becomes stuck .... 483
Sun visors .................................................. 312
Switch Fog light switch .................................... 125
Light switches ........................................ 122
Mode select switch ............................ 107
Power door lock switch .................... 25
Power switch......................................... 103
Power window switch ....................... 50
Window lock switch........................... 50
Wipers and washer switch .............126

525
Alphabetical index
ECB/VSC (Electronically 
Controlled Brake System/ 
Vehicle Stability Control) .......... 439
Electric power steering  warning light ..................................... 439
Low fuel level....................................... 440
Malfunction indicator lamp .......... 439
Master warning light .......................... 441
Open door ........................................... 440
Pre-collision system ......................... 439
Seat belt reminder light .................. 440
SRS airbags .......................................... 439
Tire pressure warning light........... 440
Warning messages Anti-lock Brake System (ABS) .. 448
Brake Assist (BA) ............................. 448
Dynamic radar cruise control ................................... 446
Engine oil level ...................................... 451
Engine oil maintenance.................... 451
Engine oil pressure........................... 444
Headlight ............................................... 445
Hill-start assist control..................... 448
Hood ....................................................... 449
Hybrid system ......................... 444, 453
Intuitive parking 
assist .............................446, 452, 456
Moon roof ............................................. 450
Open door ........................................... 449
Parking brake ...................................... 450
Pre-Collision System .......... 446, 452
Refueling ................................................ 456
Rear lights system ............................. 445
Smart access system with 
push-button start............................ 457
Steering lock ............................445, 459 Tire pressure warning

system ..................................... 445, 452
TRAC (Traction control 
system)................................................ 448
Trunk ....................................................... 450
VGRS (Variable Gear Ratio 
Steering) ............................................ 448
VSC/ECB (Vehicle Stability 
Control/Electronically Controlled 
Brake system) ................................. 448
Washer fluid ........................................ 450
Washer Checking ...............................................382
Preparing and checking 
before winter ......................................176
Switch.........................................................126
Washing and waxing ........................... 352
Weight Cargo capacity ..................................... 172
Load limits ...............................................175
Weight.................................................... 486
Wheels ...................................................... 397
Window glasses ......................................50
Window lock switch ...............................50
Windows Power windows .................................... 50
Rear window defogger.................... 199
Washer .....................................................126
Windshield wipers Position..................................................... 178
Windshield wipers ..............................126
Winter driving tips ..................................176
Wireless remote control Locking/Unlocking ............................. 22
Replacing the battery........................ 401
WMA disc ............................................... 224