2013 Lexus IS250 tire size

524
6-1. Specifications
Type E
■ Compact spare tire
Ti r e s i z eFront tires: 225/40R18 88W
Rear tires: 255/40R18 95W
Front and rear tire inflation pres-
sure
(Recommended cold tire inflation
pressure)
Driving under normal conditions Front:
35 psi (240 kPa, 2.4 kgf/cm
2 or bar)*
Rear:
38 psi (260 kPa, 2.6 kgf/cm
2 or bar)*
*: When driving at high speeds above 100
mph (160 km/h), in countries where such
speeds are permitted 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.
Wheel sizeFront wheels: 18  8J
Rear wheels: 18 8 1 /2J
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)
Ti r e s i z e
Ty p e A
T125/70D17 98M
Ty p e B
T145/70D17 106M
Tire inflation pressure
(Recommended cold tire inflation
pressure)
60 psi (420 kPa, 4.2 kgf/cm2 or bar)
Wheel size17  4T

530
6-1. Specifications
Tire information
Ty p i c a l t i r e s y m b o l s
Standard tire
Compact spare tire
Tire size (P. 5 3 2 )
DOT and Tire Identification Number (TIN) ( P. 5 3 2 )
Location of treadwear indicators ( P. 4 0 6 )
Tire ply composition and materials
Plies are layers of rubber-coated parallel cords. Cords are the strands
which form the plies in a tire.

532
6-1. 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 thatthe tire conforms to applicable
Federal Motor Vehicle Safety
Standards.
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)

536
6-1. Specifications
Maximum inflation pres-
sureThe maximum cold inflated pressure to which a tire
may be inflated, shown on the sidewall of the tire
Maximum loaded vehicle
weight
The sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options weight
Normal occupant weight150 lb. (68 kg) times the number of occupants speci-
fied in the second column of Table 1
* that follows
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
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
Tire related termMeaning

547
6
Vehicle specifications
6-3. Initialization
Items to initialize
ItemWhen to initializeReference
Maintenance data
(U.S.A. only)After the maintenance is performedP. 3 8 0
Tire pressure warning
system
• When rotating the tires with differing front and rear tire inflation pressures.
• When changing the tire inflation pressure by changing traveling
speed.
• When changing the tire size.
P. 4 0 7
The following items must be initialized for normal system operation in cases
such as after the battery is reconnected, or maintenance is performed on
the vehicle.

579
Alphabetical index
TachometerTacho indicator .................................... 153
Tachometer ............................................ 153
Tail lights Switch ........................................................ 167
Talk switch*............................................. 293
Telephone switch* ................................292
Theft deterrent system Alarm .......................................................... 93
Engine immobilizer system ............... 91
Theft prevention labels ..........................96
Tire inflation pressure...........................418
Tire information Glossary ................................................ 535
Size ........................................................... 532
Tire identification number ............. 532
Uniform tire quality grading......... 533
Tires Chains ....................................................... 201
Checking ............................................... 406
If you have a flat tire.......................... 483
Inflation pressure .................................418
Inflation pressure sensor................408
Information............................................530
Replacing............................................... 483
Rotating tires ........................................ 406
Size ........................................................... 520
Snow tires................................................ 201 Tools ...........................................................483
Total load capacity .............................. 200
Towing
Dinghy towing .................................... 206
Emergency towing........................... 455
Trailer towing ...................................... 205
TRAC............................................................ 191
Traction control ........................................ 191
Transmission shift switches .................147
Trip meter ................................................. 153
Trunk Extending trunk space ....................346
Opener ...................................................... 53
Trunk light Trunk light ................................................. 54
Wattage ..................................................525
Turn signal lights Replacing light bulbs ........................ 444
Switch........................................................ 150
Wattage ..................................................525T
*: For vehicles with a navigation system, refe r to the “Navigation System Owner’s Manual”.