tire size Lexus IS250 2007 Basic Functions / LEXUS 2007 IS350/250 (OM53578U) User Guide

298
4-3. Do-it-yourself maintenance
CAUTION
■When replacing wheels
●Do not use wheels that are a different size from those recommended in the
Owner’s Manual, as this may result in loss of handling control.
●Never use an inner tube in a leaking wheel which is designed for a tubeless tire.
Doing so may result in an accident, causing serious injury or death.
NOTICE
■Replacing tire inflation pressure sensors
●Because tire repair or replacement may affect the tire pressure sensors, make
sure to have tires serviced by your Lexus dealer or other qualified service shop. In
addition, make sure to purchase your tire pressure sensors at your Lexus dealer.
●Ensure that only Genuine Lexus wheels are used on your vehicle.
Tire pressure sensors may not work properly with non-genuine wheels.

354
5-2. Steps to take in an emergency
CAUTION
■Maintenance of the tires
Each tire, including the spare (if provided), should be checked monthly when cold
and inflated to the inflation pressure recommended by the vehicle manufacturer on
the vehicle placard or tire inflation pressure label (tire and load information label).
(If your vehicle has tires of a different size than the size indicated on the vehicle
placard or tire inflation pressure label [tire and load information label], you should
determine the proper tire inflation pressure for those tires.)
As an added safety feature, your vehicle has been equipped with a tire pressure
monitoring system (TPMS-tire pressure warning system) that illuminates a low tire
pressure telltale (tire pressure warning light) when one or more of your tires is sig-
nificantly under-inflated. Accordingly, when the low tire pressure telltale (tire pres-
sure warning light) illuminates, you should stop and check your tires as soon as
possible, and inflate them to the proper pressure. Driving on a significantly under-
inflated tire causes the tire to overheat and can lead to tire failure. Under-inflation
also reduces fuel efficiency and tire tread life, and may affect the vehicle's handling
and stopping ability.
Please note that the TPMS (tire pressure warning system) is not a substitute for
proper tire maintenance, and it is the driver's responsibility to maintain correct tire
pressure, even if under-inflation has not reached the level to trigger illumination of
the TPMS low tire pressure telltale (tire pressure warning light).

389
6-1. Specifications
6
Vehicle specifications
Steering
Tires and wheels
Type A
Free playLess than 1.2 in. (30 mm)
Ti r e s i z e205/55R16 89W, T125/70D17 98M
(spare)
Front and rear tire inflation pres-
sure
(Recommended cold tire inflation
pressure)
Driving under normal conditions
Front tires:
35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Rear tires:
38 psi (260 kPa, 2.6 kgf/cm
2 or bar)
Driving at high speeds above 100 mph (160
km/h) (in countries where such speeds are per-
mitted by law)
Add 5.8 psi (40 kPa, 0.4 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.
Spare tire inflation pressure
(Recommended cold tire inflation
pressure)
60 psi (420 kPa, 4.2 kgf/cm2 or bar, )
Wheel size16  7JJ, 17  4T (spare)
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

390
6-1. Specifications
Ty p e B
Ti r e s i z e225/45R17 90W, 245/45R17 95W, T125/
70D17 98M (spare)
Front and rear tire inflation pres-
sure
(Recommended cold tire inflation
pressure)
Driving under normal conditions
Front tires:
35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Rear tires:
38 psi (260 kPa, 2.6 kgf/cm
2 or bar)
Driving at high speeds above 100 mph (160
km/h) (in countries where such speeds are per-
mitted by law)
Add 4.5 psi (30 kPa, 0.3 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.
Spare tire inflation pressure
(Recommended cold tire inflation
pressure)
60 psi (420 kPa, 4.2 kgf/cm2 or bar)
Wheel size17  8JJ, 17  4T (spare)
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

391
6-1. Specifications
6
Vehicle specifications
Type C
Ti r e s i z e225/45R17 91V, 225/45R17 91V, T125/
70D17 98M
Front and rear tire inflation pres-
sure
(Recommended cold tire inflation
pressure)
Driving under normal conditions
Front tires:
35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Rear tires:
38 psi (260 kPa, 2.6 kgf/cm
2 or bar)
Driving at high speeds above 100 mph (160
km/h) (in countries where such speeds are per-
mitted 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.
Spare tire inflation pressure
(Recommended cold tire inflation
pressure)
60 psi (420 kPa, 4.2 kgf/cm2 or bar)
Wheel size17  8JJ, 17  4T (spare)
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

392
6-1. Specifications
Ty p e D
Ti r e s i z e
Front tires: 225/45R17 95V
Rear tires: 245/45R17 95V
Spare tire: T125/70R17 98M
Front and rear tire inflation pres-
sure
(Recommended cold tire inflation
pressure)
Driving under normal conditions
Front tires:
35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Rear tires:
38 psi (260 kPa, 2.6 kgf/cm
2 or bar)
Driving at high speeds above 100 mph (160
km/h) (in countries where such speeds are per-
mitted by law)
Add 10 psi (70 kPa, 0.7 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.
Spare tire inflation pressure
(Recommended cold tire inflation
pressure)
60 psi (420 kPa, 4.2 kgf/cm2 or bar)
Wheel size17  8JJ, 17  4T (spare)
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

393
6-1. Specifications
6
Vehicle specifications
Type E
Ti r e s i z e
Front tires: 225/40R18 88Y
Rear tires: 255/40R18 95Y
Spare tire: T145/70R17 106M
Front and rear tire inflation pres-
sure
(Recommended cold tire inflation
pressure)
Driving under normal conditions
Front tires:
35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Rear tires:
38 psi (260 kPa, 2.6 kgf/cm
2 or bar)
Driving at high speeds above 100 mph (160
km/h) (in countries where such speeds are per-
mitted 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.
Spare tire inflation pressure
(Recommended cold tire inflation
pressure)
60 psi (420 kPa, 4.2 kgf/cm2 or bar)
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)

398
6-1. Specifications
Tire information
Ty p i c a l t i r e s y m b o l s
Tire size (P. 4 0 0 )
DOT and Tire Identification Number (TIN) (P. 399)
Location of tread wear indicators (P. 4 0 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.
Radial tires or bias-ply tires
A radial tire has RADIAL on the sidewall. A tire not marked RADIAL is a
bias-ply tire.
TUBELESS or TUBE TYPE
A tubeless tire does not have a tube and air is directly filled in the tire. A
tube type tire has a tube inside the tire and the tube maintains the air pres-
sure.
Load limit at maximum cold tire inflation pressure (P. 403)
Maximum cold tire inflation pressure (P. 403)
This means the pressure to which a tire may be inflated.
Uniform tire quality grading
For details, see "Uniform tire quality grading" that follows.

399
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.
Summer tire or all season tire (P. 4 0 1 )
An all season tire has "M+S" on the sidewall. A tire not marked "M+S" is a
summer tire.

400
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)
■Tire dimensions
Section width
Ti r e h e i g h t
Wheel diameter