tire size Lexus GS350 2008 Using the audio system / LEXUS 2008 GS460/350 (OM30A87U) User Guide

5
When trouble arises
495
5-2. Steps to take in an emergency
GS_G_U
May 13, 2008 5:14 pm
CAUTION
■Maintenance of the tires
Each tire, including the spare (if provided), should be checked monthly when cold
and inflated to the inflation pressure re commended by the vehicle manufacturer on
the vehicle placard or tire inflation pressure label (tire and load information label).
(If your vehicle has tires of a different size than the size indicated on the vehicle
placard or tire inflation pressure label [tire and load information label], you should
determine the proper tire inflation 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 warning light) when one or more of your tires is sig-
nificantly under-inflated. Accordingly, when the low tire pressure telltale (tire pres-
sure warning light) illuminates, you should stop and check your tires as soon as
possible, and inflate them to the proper pressure. Driving on a significantly under-
inflated tire causes the tire to overheat an d can lead to tire failure. Under-inflation
also reduces fuel efficiency and tire tread life, and may affect the vehicle’s handling
and stopping ability.
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 illumination 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 th e system is not operating properly. The
TPMS (tire pressure warning system) malf unction indicator is combined with the
low tire pressure telltale (tire pressure 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 subsequent vehicle
start-ups as long as the malfunction exists . When the malfunction indicator is illumi-
nated, 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 rea-
sons, including the installation of replacem ent or alternate tires or wheels on the
vehicle that prevent the TPMS (tire pressure warning system) from functioning
properly. Always check the TPMS (tire pressure warning system) malfunction tell-
tale 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.

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6-1. Specifications
GS_G_U
May 13, 2008 5:14 pm
Tires and wheelsTy p e A
Ti r e s i z e245/40R18 93Y, P245/40R18 93V, 
245/40ZR18, T155/70D17 110M (spare)
Front and rear tire inflation 
pressure
(Recommended cold tire inflation
pressure)
Driving under normal conditions 
33 psi (230 kPa, 2.3 kgf/cm2 or bar)
Driving at high speeds above 100 mph (160
km/h) (in countries where such speeds are per-
mitted by law) Add 9 psi (60 kPa, 0.6 kgf/cm
2 or bar) to the
front tires and rear tires. Never exceed the
maximum cold tire inflation pressure indicated
on the tire sidewall.
Spare tire inflation pressure 
(Recommended cold tire inflation
pressure)
60 psi (420 kPa, 4.2 kgf/cm2 or bar)
Wheel size18  8 J, 17  4T (spare)
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

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6-1. Specifications
6
Vehicle specifications
GS_G_U
May 13, 2008 5:14 pm
Type B
Ti r e s i z e225/50R17 94W, P225/50R17 93V,
T155/70D17 110M (spare)
Front and rear tire inflation 
pressure
(Recommended cold tire inflation
pressure)
Driving under normal conditions 
33 psi (230 kPa, 2.3 kgf/cm2 or bar)
Driving at high speeds above 100 mph (160
km/h) (in countries where such speeds are per-
mitted by law) Add 7 psi (50 kPa, 0.5 kgf/cm
2 or bar) to the
front tires and rear tires. Never exceed the
maximum cold tire inflation pressure indicated
on the tire sidewall.
Spare tire inflation pressure 
(Recommended cold tire inflation
pressure)
60 psi (420 kPa, 4.2 kgf/cm2 or bar)
Wheel size17  7 1 /2 J, 17  4T (spare)
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

556
6-1. Specifications
GS_G_U
May 13, 2008 5:14 pm
Tire information
Ty p i c a l t i r e s y m b o l s
Tire size(P. 559)
DOT and Tire Identification Number (TIN) ( P. 5 5 8 )
Location of treadwear indicators ( P. 421)
Run-flat tire (RFT) or standard tire ( P. 522)
This vehicle can be equipped with eith er run-flat tires (RFT) or standard
tires. A “RFT” or “DSST” mark is molded on the sidewall of the run-flat tire.

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6-1. Specifications
GS_G_U
May 13, 2008 5:14 pm
Typical DOT and tire identification number (TIN)DOT symbol
*
Tire Identification Number (TIN)
Tire manufacturer’s identifica-
tion mark
Tire size code
Manufacturer’s optional tire
type code (3 or 4 letters)
Manufacturing week
Manufacturing year
*: The DOT symbol certifies that the tire conforms to applicable
Federal Motor Vehicle Safety
Standards.

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6-1. Specifications
6
Vehicle specifications
GS_G_U
May 13, 2008 5:14 pm
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

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6-1. Specifications
GS_G_U
May 13, 2008 5:14 pm
Tire related termMeaning
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
We a t h e r s i d eThe 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 substantially
less than 90 degrees to the centerline of the tread
CarcassThe tire structure, except tread and sidewall rubber
which, when inflated, bears the load

575
6
Vehicle specifications
GS_G_U
May 13, 2008 5:14 pm
6-3. Initialization
Items to initialize
ItemWhen to initializeReference
Intuitive parking assist
• After reconnecting or changing the battery
• After changing a fuse
P. 5 0 7
Engine oil maintenance
data• After changing engine oilP. 4 1 2
Tire pressure warning
system
• When rotating the tires on vehicles differing with front and rear tire infla-
tion pressures.
• When changing the tire inflation pressure by changing traveling speed
or load weight, etc.
• When changing the tire size.
P. 4 2 3
After reconnecting or performing main tenance on the 12 volt battery, the
following items must be initialized for normal system operation.

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Alphabetical index
GS_G_U
May 13, 2008 5:14 pm
Smart access system with 
push-button start Antenna location....................................24
Entry function...........................................22
Starting the engine ................................121
Spare tire Inflation pressure............................... 550
Spare tire..................................................513
Spark plug ................................................546
Specifications ........................................ 540
Speedometer........................................... 132
Steering wheel Adjustment............................................... 60
Audio switches ...................................288
Steering wheel position 
memory...................................................47
Storage compartment ........................ 344
Storage feature......................................340
Stuck If your vehicle becomes stuck.....536
Sun visors ................................................. 347
Switch “ENGINE START STOP” 
switch .......................................................121
Fog light switch .....................................145
Ignition switch..........................................121
Light switches ........................................ 142
Mode select switch............................. 126
Power door lock switch .....................37
Power window switch ........................ 64
Tire pressure warning 
reset switch ....................................... 422
Tire pressure 
warning select switch................... 424
Window lock switch ........................... 64
Wipers and washer switch .............146 Tachometer ..............................................132
Tail lights
Switch ........................................................ 142
Theft deterrent system Alarm........................................................... 75
Immobilizer system .............................. 73
Theft prevention labels........................... 77
Tire inflation pressure .........................550
Tire information Glossary ................................................ 562
Size ........................................................... 559
Tire identification number .............558
Uniform Tire Quality Grading ... 560
Tires Chains..................................................... 200
Checking................................................. 421
Compact spare tire............................ 513
If you have a flat tire ............... 512, 522
Inflation pressure ...............................550
Information ........................................... 556
Replacing ................................................ 512
Rotating tires.......................................... 421
Size ...........................................................550
Snow tires.............................................. 202
Tire pressure warning system....... 421
Tools.............................................................512
Total load capacity ................................ 198
Touch screen..........................................208
Towing Dinghy towing .................................... 205
Emergency towing ........................... 478
Trailer towing ...................................... 204
Traction control...................................... 184
Trip meter ..................................................132T