2007 Lexus IS250 tire size

393
6-1. Specifications
6
Vehicle specifications
Type E
Ti r e s i z e
Front tires: 225/40R18 88Y
Rear tires: 255/40R18 95Y
Spare tire: T145/70R17 106M
Front and rear tire inflation pres-
sure
(Recommended cold tire inflation
pressure)
Driving under normal conditions
Front tires:
35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Rear tires:
38 psi (260 kPa, 2.6 kgf/cm
2 or bar)
Driving at high speeds above 100 mph (160
km/h) (in countries where such speeds are per-
mitted by law)
Add 7.2 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 size
Front wheels: 18  8J
Rear wheels: 18 8 1 /2J
Spare wheel: 17  4T
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

398
6-1. Specifications
Tire information
Ty p i c a l t i r e s y m b o l s
Tire size (P. 4 0 0 )
DOT and Tire Identification Number (TIN) (P. 399)
Location of tread wear indicators (P. 4 0 1 )
Tire ply composition and materials
Plies are layers of rubber-coated parallel cords. Cords are the strands
which form the plies in a tire.
Radial tires or bias-ply tires
A radial tire has RADIAL on the sidewall. A tire not marked RADIAL is a
bias-ply tire.
TUBELESS or TUBE TYPE
A tubeless tire does not have a tube and air is directly filled in the tire. A
tube type tire has a tube inside the tire and the tube maintains the air pres-
sure.
Load limit at maximum cold tire inflation pressure (P. 403)
Maximum cold tire inflation pressure (P. 403)
This means the pressure to which a tire may be inflated.
Uniform tire quality grading
For details, see "Uniform tire quality grading" that follows.

399
6-1. Specifications
6
Vehicle specifications
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.
Summer tire or all season tire (P. 4 0 1 )
An all season tire has "M+S" on the sidewall. A tire not marked "M+S" is a
summer tire.

400
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

404
6-1. Specifications
Tire related termMeaning
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
Vehicle capacity weight
(Total load capacity)The rated cargo and luggage load plus 150 lb. (68
kg) times the vehicle's designated seating capacity
Intended outboard side-
wall
(a) The sidewall that contains a whitewall, bears
white lettering, or bears manufacturer, brand,
and/or model name molding that is higher or
deeper than the same molding on the other side-
wall of the tire, or
(b) The outward facing sidewall of asymmetrical tire
that has a particular side that must always face
outward when mounted on a vehicle
Occupant distributionDistribution of occupants in a vehicle as specified in
the third column of Table 1
* below
Recommended inflation
pressureCold tire inflation pressure recommended by a man-
ufacturer.
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

422
Alphabetical index
Shift lever lighting .................................209
Shift lock system .................................... 367
Shopping bag hooks............................238
Side airbags................................................. 61
Side marker lights
Switch ........................................................ 122
Side mirror
Adjusting and folding ......................... 43
Driving position memory.................. 28
Smart access system with
push-button start
Entry function..............................................4
Starting the engine ............................... 98
Spare tire
Inflation pressure................................ 293
Spare tire................................................358
Spark plug ............................................... 385
Specifications ........................................ 380
Speedometer
Speed indicator ................................... 109
Speedometer........................................ 109
Steering wheel
Audio switches ................................... 207
Driving position memory.................. 28
Manual adjustment .............................. 40
Power adjustment .................................. 41
Storage feature....................................... 213
Stuck
If your vehicle becomes stuck......377
Sun visors .................................................. 219
Sunshade
Rear .......................................................... 233
Roof ............................................................. 49
Switch
ECT switch .............................................102
Engine switch.......................................... 98
ETCS switch.......................................... 105Fog light switch .................................... 125
Light switches.........................................122
Power door lock switch...................... 19
Power window switch ........................45
Satellite switches................................. 222
Transmission shift switches ............ 103
Window lock switch ............................45
Wipers and washer switch............. 126
Tachometer
Tacho indicator ....................................109
Tachometer............................................ 109
Tail lights
Switch .........................................................122
Theft deterrent system
Alarm.......................................................... 56
Engine immobilizer system ..............54
Theft prevention labels.......................... 58
Tire inflation pressure ......................... 293
Tire information
Glossary ................................................ 403
Size ........................................................... 400
Tire identification number ............. 399
Uniform tire quality grading........... 401
Tires
Chains......................................................... 161
Checking............................................... 283
If you have a flat tire ......................... 358
Inflation pressure ................................293
Inflation pressure sensor ............... 284
Information ........................................... 398
Replacing .............................................. 358
Rotating tires........................................ 283
Size ........................................................... 389
Snow tires.................................................. 161
Tools...........................................................358
T