2012 Lexus IS250C tire size

576
6-1. Specifications
Ty p e 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 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 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)

582
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. 585)
DOT and Tire Identification Number (TIN) ( P. 584)
Location of treadwear indicators ( P. 4 3 7 )
Tire ply composition and materials
Plies are layers of rubber-coated parallel cords. Cords are the strands
which form the plies in a tire.

584
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.

585
6-1. Specifications
6
Vehicle 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

589
6-1. Specifications
6
Vehicle 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

600
6-3. Initialization
Items to initialize
ItemWhen to initializeReference
Maintenance data
(U.S.A. only)After the maintenance is performedP. 4 1 1
Tire pressure warning
system
• When changing the tire inflation pressure by changing traveling
speed.
• When changing the tire size.
P. 4 3 7
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.

628
Alphabetical index
TachometerTacho indicator.....................................166
Tachometer ............................................166
Tail lights Switch ......................................................... 181
Talk switch* .............................................332
Telephone switch*................................332
Theft deterrent system Alarm ........................................................ 100
Engine immobilizer system ............. 98
Theft prevention labels ........................ 103
Tire inflation pressure ......................... 447
Tire information Glossary................................................ 588
Size .......................................................... 585
Tire identification number .............584
Uniform tire quality grading ........ 586
Tires Chains ..................................................... 238
Checking ............................................... 437
If you have a flat tire ........................... 518
Inflation pressure................................ 447
Inflation pressure sensor................438
Information............................................582
Replacing ................................................ 518
Rotating tires ........................................ 437
Run-flat tire............................................ 527
Size ........................................................... 572
Snow tires .............................................. 238
Spare tire................................................. 518
Tools ............................................................ 518
Total load capacity ............................... 237 Towing
Dinghy towing ......................... 243, 244
Emergency towing ........................... 487
Trailer towing ....................................... 242
TRAC ..........................................................219
Traction control.......................................219
Transmission shift switches.......155, 157
Trip meter ..................................................166
Trunk Opener ....................................................... 51
Trunk light Trunk light .................................................52
Wattage ..................................................577
Turn signal lights Replacing light bulbs ........................475
Switch ........................................................ 162
Wattage ..................................................577
USB port* ................................................ 293
Vanity lights Vanity lights.......................................... 369
Wattage ..................................................577
Vanity mirrors ........................................ 369
VDIM...........................................................219
Vehicle dynamics integrated management .........................................219
Vehicle identification number...........561
Vehicle stability control .......................219
Ventilators ................................................377
Voice command switch* ................... 333
VSC .............................................................219T
U
V