2013 LEXUS IS250C tire size

567
6-1. Specifications
6
Vehicle specifications
Type E
Ti r e s i z eFront tires: 225/40RF18 88V
Rear tires: 255/40RF18 95V
Front and rear tire inflation pres-
sure
(Recommended cold tire inflation
pressure)
Driving under normal conditionsFront:
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 11.7 psi (80 kPa,
0.8 kgf/cm
2 or bar) to the front tires and rear
tires. Never exceed the maximum cold tire
inflation pressure indicated on the tire side-
wall.
Wheel sizeFront wheels: 18  8J
Rear wheels: 18 8 1 /2J
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

573
6-1. Specifications
6
Vehicle 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 76 )
DOT and Tire Identification Number (TIN) ( P. 575)
Location of treadwear indicators ( P. 4 3 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.

575
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.

576
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)
Run-flat tire code

580
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

590
6-3. Initialization
Items to initialize
ItemWhen to initializeReference
Maintenance data
(U.S.A. only)After the maintenance is performedP. 4 0 5
Tire pressure warning
system
• When changing the tire inflation pressure by changing traveling
speed.
• When changing the tire size.
P. 4 3 1
The following item must be initialized for normal system operation in cases
such as after the battery is reconnected, or maintenance is performed on
the vehicle.

620
Alphabetical index
TachometerTacho indicator...................................... 161
Tachometer ............................................. 161
Tail lights Switch ........................................................ 176
Talk switch* ............................................. 326
Telephone switch*................................ 326
Theft deterrent system Alarm ........................................................ 100
Engine immobilizer system ............. 98
Theft prevention labels ........................ 103
Tire inflation pressure .......................... 441
Tire information Glossary................................................. 579
Size ........................................................... 576
Tire identification number ............. 575
Uniform tire quality grading ......... 577
Tires Chains ..................................................... 233
Checking ................................................. 431
If you have a flat tire ............................513
Inflation pressure.................................. 441
Inflation pressure sensor................ 432
Information............................................ 573
Replacing .................................................513
Rotating tires .......................................... 431
Run-flat tire............................................ 522
Size ...........................................................563
Snow tires .............................................. 233
Spare tire..................................................513
Tools ............................................................ 513
Total load capacity ............................... 232 Towing
Dinghy towing .................................... 238
Emergency towing ........................... 483
Trailer towing ....................................... 237
TRAC ..........................................................214
Traction control.......................................214
Transmission shift switches...... 153, 155
Trip meter ................................................... 161
Trunk Opener ....................................................... 51
Trunk light Trunk light .................................................52
Wattage ................................................. 568
Turn signal lights Replacing light bulbs ....................... 468
Switch ........................................................158
Wattage ................................................. 568
USB port* ................................................ 287
Vanity lights Vanity lights.......................................... 363
Wattage ................................................. 568
Vanity mirrors ........................................ 363
VDIM...........................................................214
Vehicle data recordings ......................... 21
Vehicle dynamics integrated management .........................................214
Vehicle identification number......... 553
Vehicle stability control .......................214
Ventilators ................................................. 371
Voice command switch* ................... 327
VSC .............................................................214T
U
V