2010 Lexus IS250C tire size

546
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)

551
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 5 4 )
DOT and Tire Identification Number (TIN) ( P. 5 5 3 )
Location of treadwear indicators ( P. 412)
Tire ply composition and materials
Plies are layers of rubber-coated parallel cords. Cords are the strands
which form the plies in a tire.

553
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.

554
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

558
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

569
6
Vehicle specifications
6-3. Initialization
Items to initialize
ItemWhen to initializeReference
Engine oil maintenance
data (U.S.A. only)After changing engine oilP. 4 0 1
Tire pressure warning
system
• When changing the tire inflation pressure by changing traveling
speed.
• When changing the tire size.
P. 4 1 2
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.

588
Alphabetical index
TachometerTacho indicator.................................... 160
Tachometer ........................................... 160
Tail lights Switch ........................................................ 174
Talk switch ..................................................311
Telephone switch .....................................311
Theft deterrent system Alarm .......................................................... 95
Engine immobilizer system ............. 93
Theft prevention labels .......................... 97
Tire inflation pressure ......................... 422
Tire information Glossary................................................. 557
Size ...........................................................554
Tire identification number .............553
Uniform tire quality grading ........ 555
Tires Chains ..................................................... 220
Checking ................................................. 412
If you have a flat tire .......................... 492
Inflation pressure................................ 422
Inflation pressure sensor.................. 413
Information............................................. 551
Replacing ............................................... 492
Rotating tires .......................................... 412
Run-flat tire............................................. 501
Size ........................................................... 542
Snow tires .............................................. 220
Spare tire................................................ 492
Tools ........................................................... 492
Total load capacity ................................ 219 Towing
Dinghy towing .........................225, 226
Emergency towing ........................... 459
Trailer towing ....................................... 224
TRAC ........................................................ 204
Traction control..................................... 204
Transmission shift switches........ 149, 151
Trip meter ................................................. 160
Trunk Opener ...................................................... 47
Trunk light Trunk light ................................................ 48
Wattage ..................................................547
Turn signal lights Replacing light bulbs ....................... 450
Switch ........................................................ 156
Wattage ..................................................547
Vanity lights Vanity lights...........................................347
Wattage ..................................................547
Vanity mirrors ........................................ 347
VDIM......................................................... 204
Vehicle dynamics integrated management ....................................... 204
Vehicle identification number......... 533
Vehicle stability control ..................... 204
Ventilators ............................................... 355
Voice command switch .......................312
VSC ........................................................... 204T
V