wheel Lexus IS250C 2014 Owners Manual

566
6-1. Specifications
IS250C/350C_UTy p e D
Ti r e s i z e
Front tires: 225/40R18 88W
Rear tires: 255/40R18 95W
Spare tire: T145/70D17 106M
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)*
Spare:
60 psi (420 kPa, 4.2 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 side-
wall.
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)

567
6-1. Specifications
6
Vehicle specifications
IS250C/350C_UType 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)

576
6-1. Specifications
IS250C/350C_U
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

577
6-1. Specifications
6
Vehicle specifications
IS250C/350C_U■
Tire dimensions
Section width
Tire height
Wheel diameter
Tire section names
Bead
Sidewall
Shoulder
Tr e a d
Belt
Inner liner
Reinforcing rubber
Carcass
Rim lines
Bead wires
Chafer
Uniform Tire Quality GradingThis information has been prepared in accordance with regulations
issued by the National Highway Traffic Safety Administration of the U.S.
Department of Transportation.
It provides the purchasers and/or prospective purchasers of Lexus vehi-
cles with information on uniform tire quality grading.
Your Lexus dealer will help answer any questions you may have as you read
this information.

579
6-1. Specifications
6
Vehicle specifications
IS250C/350C_U■
Temperature A, B, C
The temperature grades are A (the highest), B, and C, representing
the tire's resistance to the generation of heat and its ability to dissipate
heat when tested under controlled conditions on a specified indoor
laboratory test wheel.
Sustained high temperature can cause the material of the tire to degenerate
and reduce tire life, and excessive temperature can lead to sudden tire fail-
ure.
The grade C corresponds to a level of performance which all passenger car
tires must meet under the Federal Motor Vehicle Safety Standard No. 139.
Grades B and A represent higher levels of performance on the laboratory
test wheel than the minimum required by law.
Warning: The temperature grades for this tire are established for a tire that
is properly inflated and not overloaded.
Excessive speed, underinflation, or excessive loading, either separately or in
combination, can cause heat buildup and possible tire failure.
Glossary of tire terminology
Tire related termMeaning
Accessory weight
The combined weight (in excess of those standard
items which may be replaced) of automatic transmis-
sion, power steering, power brakes, power windows,
power seats, radio and heater, to the extent that these
items are available as factory-installed equipment
(whether installed or not)
Cold tire inflation pres-
sureTire pressure when the vehicle has been parked for
three hours or more, or has not been driven more
than 1 mile or 1.5 km under that condition
Curb weight
The weight of a motor vehicle with standard equip-
ment, including the maximum capacity of fuel, oil and
coolant, and if so equipped, air conditioning and
additional weight optional engine

580
6-1. Specifications
IS250C/350C_U
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

584
6-1. Specifications
IS250C/350C_U
Ply separationA parting of rubber compound between adjacent
plies
Pneumatic tire
A mechanical device made of rubber, chemicals, fab-
ric and steel or other materials, that, when mounted
on an automotive wheel, provides the traction and
contains the gas or fluid that sustains the load
Radial ply tire
A pneumatic tire in which the ply cords that extend to
the beads are laid at substantially 90 degrees to the
centerline of the tread
Reinforced tire
A tire designed to operate at higher loads and at
higher inflation pressures than the corresponding
standard tire
Section width
The linear distance between the exteriors of the side-
walls of an inflated tire, excluding elevations due to
labeling, decoration, or protective bands
SidewallThat portion of a tire between the tread and bead
Sidewall separationThe parting of the rubber compound from the cord
material in the sidewall
Snow tire
A tire that attains a traction index equal to or greater
than 110, compared to the ASTM E-1136 Standard
Reference Test Tire, when using the snow traction test
as described in ASTM F-1805-00, Standard Test
Method for Single Wheel Driving Traction in a
Straight Line on Snow-and Ice-Covered Surfaces,
and which is marked with an Alpine Symbol (
)
on at least one sidewall
Te s t r i mThe rim on which a tire is fitted for testing, and may be
any rim listed as appropriate for use with that tire
Tire related termMeaning

585
6-1. Specifications
6
Vehicle specifications
IS250C/350C_U
*:Table 1  Occupant loading and distribution for vehicle normal load forvarious designated seating capacities
Tr e a dThat portion of a tire that comes into contact with the
road
Tr e a d r i bA tread section running circumferentially around a
tire
Tread separationPulling away of the tread from the tire carcass
Treadwear indicators
(TWI)The projections within the principal grooves
designed to give a visual indication of the degrees of
wear of the tread
Wheel-holding fixtureThe fixture used to hold the wheel and tire assembly
securely during testing
Designated seating
capacity, Number of occupantsVehicle normal load,
Number of occupantsOccupant distribution in
a normally loaded vehicle
2 through 422 in front
5 through 1032 in front, 1 in second seat
11 through 155
2 in front, 1 in second
seat, 1 in third seat, 1 in fourth seat
16 through 207
2 in front, 2 in second
seat, 2 in third seat, 1 in fourth seat
Tire related termMeaning

588
6-2. Customization
IS250C/350C_U
Steering
wheel
(
→P. 76 )
Auto tilt-away functionOnOff
Power win-
dows
(
→P. 8 2 )
Wireless remote control
linked operationOffOn
Retractable
hardtop
(
→P. 9 0 )
Retractable hardtop
operation control linked
to the intuitive parking
assist
OnOff
Automatic
light control
system
(
→P. 1 76 )
Light sensor sensitivityLevel 3Level 1 to 5
Ti m e e l a p s e d b e f o r e
headlights automatically
turn off after doors are
closed
30 seconds
0 seconds
60 seconds
90 seconds
Lights
(
→P. 1 7 8 )
Daytime running light sys-
tem (U.S.A. only)OnOff
Windshield
wipers and
washer
(
→P. 1 8 2 )
Switching operation when
the vehicle is stationaryOnOff
Drip prevention functionOnOff
Ti m e e l a p s e d b e f o r e t h e
drip prevention function
operatesVa r i a b l e
depending on
the vehicle
speed
3 seconds
ItemFunctionDefault settingCustomizedsetting

610
IS250C/350C_U
Alphabetical index
Alphabetical index
A/C* .......................................................... 242
ABS.............................................................. 214
Air conditioning filter .......................... 447
Air conditioning systemAir conditioning filter ....................... 447
Automatic air conditioning system .................................................. 242
Airbags
Airbag operating conditions......... 108
Airbag precautions for your child...........................................................112
Airbag warning light ........................ 492
Front passenger occupant classification system..........................117
General airbag pr ecautions ............112
Locations of airbags.......................... 106
Modification and disposal of airbags .................................................... 116
Proper driving posture ............ 104, 112
Side airbag operating conditions............................................ 109
Side airbag precautions .....................112
SRS airbags ........................................... 106
Alarm ..........................................................100
Antenna* ................................................... 261
Anti-lock brake system ....................... 214
Ashtrays ....................................................369
Audio input*............................................298 Audio system*
Antenna.................................................... 261
AUX port .............................................. 298
Bluetooth
® audio ............................. 303
CD player/changer ..........................264
iPod ...........................................................279
MP3/WMA disc..................................271
Optimal use ......................................... 296
Portable music player ..................... 298
Radio ....................................................... 256
Steering wheel audio switch........300
USB memory .......................................287
USB port ................................................287
Automatic air conditioning
system* .................................................. 242
Automatic headlight leveling
system ...................................................... 179
Automatic light control system......... 176
Automatic transmission Automatic transmission .....................151
If the shift lever cannot be shifted from P................................... 526
S mode ..................................................... 155
AUX port* .............................................. 298
A