2019 LEXUS UX250H Owners Manual

4258-1. Specifications
8
Vehicle specifications
Tire size (P.426)
Run-flat tire (RFT) or standard tire ( P.399)
This vehicle can be equipped with either run-flat tires (RFT) or standard tires. A
mark is molded on the sidewall of the run-flat tire.
DOT and Tire Identification Number (TIN) ( P.426)
Location of treadwear indicators ( P.345)
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 put into the tire. A tube type tire has a
tube inside the tire and the tube maintains the air pressure.
Load limit at maximum cold tire inflation pressure ( P.429)
Maximum cold tire inflation pressure ( P.429)
This means the pressure to which a tire may be inflated.
Uniform tire quality grading
For details, see “Uniform Tire Quality Grading” that follows.
Tire information
Typical tire symbols
A
B
C
D
E
F
G
H
I
J

4268-1. Specifications
Summer tires or all season tires (P.346)
An all season tire has “M+S” on the sidewall. A tire not marked “M+S” is a summer tire.
Type A
DOT symbol
*
Tire Identification Number (TIN)
Tire manufacturer’s identification
mark
Tire size code
Manufacturer’s optional tire type
code (3 or 4 letters)
Manufacturing week
Manufacturing year
*:The DOT symbol cert ifies that the tire
conforms to applicable Federal Motor
Vehicle Safety Standards.
Type B
DOT symbol
*
Tire Identification Number (TIN)
Tire manufacturer’s identification
mark
Manufacturer’s code
Manufacturing week
Manufacturing year
*: The DOT symbol certifies that the tire conforms to applicable Federal Motor
Vehicle Safety Standards.
■Typical tire size information
The illustration indicates typical tire
size.
K
Typical DOT and Tire Identifica-
tion Number (TIN)
A
B
C
D
E
F
GTire size
A
B
C
D
E
F

4278-1. Specifications
8
Vehicle specifications
Tire use
(P = Passenger car,
T = Temporary use)
Section width (millimeters)
Aspect ratio
(tire height to section width)
Tire construction code
(R = Radial, D = Diagonal)
Run-flat tire code
Wheel diameter (inches)
Load index (2 digits or 3 digits)
Speed symbol (alphabet with one
letter)
■Tire dimensionsSection width
Tire height
Wheel diameter Bead
Sidewall
Shoulder
Tread
Belt
Inner liner
Reinforcing rubber
Carcass
Rim lines
Bead wires
Chafer
This 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 pro-
spective purchasers of Lexus vehicles
with information on uniform tire quality
grading.
Your Lexus dealer will help answer any
questions you may have as you read this
A
B
C
D
E
F
G
H
A
B
C
Tire section names
Uniform Tire Quality Grading
A
B
C
D
E
F
G
H
I
J
K

4288-1. Specifications
information.
■DOT quality grades
All passenger vehicle tires must con-
form to Federal Safety Requirements in
addition to these grades. Quality
grades can be found where applicable
on the tire sidewall between tread
shoulder and maximum section width.
For example: Treadwear 200 Traction AA
Temperature A
■Treadwear
The treadwear grade is a comparative
rating based on the wear rate of the tire
when tested under controlled condi-
tions on a specified government test
course.
For example, a tire graded 150 would wear
one and a half (1 - 1/2) times as well on the
government course as a tire graded 100.
The relative performa nce of tires depends
upon the actual conditions of their use,
however, and may depart significantly from
the norm due to variatio ns in driving habits,
service practices and differences in road
characteristics and climate.
■Traction AA, A, B, C
The traction grades, from highest to
lowest, are AA, A, B and C, and they
represent the tire’s ability to stop on
wet pavement as measured under con-
trolled conditions on specified govern-
ment test surfaces of asphalt and
concrete.
A tire marked C may have poor traction
performance.
Warning: The traction grade assigned to
this tire is based on braking (straight
ahead) traction tests and does not include
cornering (turning) traction.
■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 condi-
tions 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 sudd en tire failure.
Grade C corresponds to a level of perfor-
mance which all passenger car tires must
meet under the Fede ral Motor Vehicle
Safety Standard No. 109.
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 prop-
erly inflated and not overloaded.
Excessive speed, unde rinflation, or exces-
sive loading, either separately or in combi-
nation, can cause heat buildup and
possible tire failure.

4298-1. Specifications
8
Vehicle specifications
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pressure
Tire 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
Maximum inflation pressureThe maximum cold inflated pre ssure to which a tire may be
inflated, shown on th e sidewall of the tire
Recommended inflation
pressureCold tire inflation pressure recommended by a manufac-
turer
Accessory weight
The combined weight (in excess of those standard items
which may be replaced) of hybr id transmission, power steer-
ing, 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)
Curb weight
The weight of a motor vehicle with standard equipment,
including the maximum capacity of fuel, oil and coolant, and
if so equipped, air conditio ning and additional weight
optional engine
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 specified in
the second column of Table 1
* that follows
Occupant distributionDistribution of occupants in a ve hicle as specified in the third
column of Table 1
* below
Production options weight
The combined weight of in stalled regular production
options weighing over 5 lb. (2.3 kg) in excess of the stan-
dard items which they replace, not previously considered in
curb weight or accessory we ight, including heavy duty
brakes, ride levelers, roof r ack, heavy duty 12-volt battery,
and special trim
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

4308-1. Specifications
Rim size designationRim diameter and width
Rim type designationThe industry manufacturer’s designation for a rim by style or
code
Rim widthNominal distance between rim flanges
Vehicle capacity weight
(Total load capacity)The rated cargo and luggage load plus 150 lb. (68 kg) times
the vehicle’s designated seating capacity
Vehicle maximum load on
the tireThe load on an individual tire that is determined by distribut-
ing to each axle its share of the maximum loaded vehicle
weight, and dividing by two
Vehicle normal load on the
tire
The load on an individual tire that is determined by distribut-
ing to each axle its share of curb weight, accessory weight,
and normal occupant weight (distributed in accordance with
Table 1
* below), and dividing by two
Weather sideThe surface area of the rim not covered by the inflated tire
BeadThe part of the tire that is ma de of steel wires, wrapped or
reinforced by ply cords and th at is shaped to fit the rim
Bead separationA breakdown of the bond between components in the bead
Bias ply tire
A pneumatic tire in which the ply cords that extend to the
beads are laid at alternate angles substantially less than 90
degrees to the centerline of the tread
CarcassThe tire structure, except tread and sidewall rubber which,
when inflated, bears the load
ChunkingThe breaking away of pieces of the tread or sidewall
CordThe strands forming the plies in the tire
Cord separationThe parting of cords from adjacent rubber compounds
CrackingAny parting within the tread, side wall, or innerliner of the tire
extending to cord material
CT
A pneumatic tire with an inverted flange tire and rim system
in which the rim is designed wi th rim flanges pointed radially
inward and the tire is designed to fit on the underside of the
rim in a manner that encloses the rim flanges inside the air
cavity of the tire
Extra load tireA tire designed to operate at higher loads and at higher
inflation pressures than the corresponding standard tire
Tire related termMeaning

4318-1. Specifications
8
Vehicle specifications
GrooveThe space between two adjacent tread ribs
InnerlinerThe layer(s) forming the inside surface of a tubeless tire that
contains the inflating medium within the tire
Innerliner separationThe parting of the innerliner fr om cord material in the car-
cass
Intended outboard sidewall
(a) The sidewall that contains a whitewall, bears white letter-
ing, or bears manufacturer, brand, and/or model name
molding that is higher or deep er than the same molding on
the other sidewall of the tire, or
(b) The outward facing sidewall of an asymmetrical tire that
has a particular side that must always face outward when
mounted on a vehicle
Light truck (LT) tire
A tire designated by its manuf acturer as primarily intended
for use on lightweight trucks or multipurpose passenger
vehicles
Load ratingThe maximum load that a tire is rated to carry for a given
inflation pressure
Maximum load ratingThe load rating for a tire at the maximum permissible infla-
tion pressure for that tire
Maximum permissible infla-
tion pressureThe maximum cold inflation pre ssure to which a tire may be
inflated
Measuring rimThe rim on which a tire is fitted for physical dimension
requirements
Open spliceAny parting at any junction of tread, sidewall, or innerliner
that extends to cord material
Outer diameterThe overall diameter of an inflated new tire
Overall width
The linear distance between the exteriors of the sidewalls of
an inflated tire, including elev ations due to labeling, decora-
tions, or protective bands or ribs
Passenger car tire
A tire intended for use on passenger cars, multipurpose
passenger vehicles, and trucks, that have a gross vehicle
weight rating (GVWR) of 10,000 lb. or less.
PlyA layer of rubber-coated parallel cords
Ply separationA parting of rubber compound between adjacent plies
Tire related termMeaning

4328-1. Specifications
*:Table 1  Occupant loading and distribution for vehicle normal load for various desig-
nated seating capacities
Pneumatic tire
A mechanical device made of rubber, chemicals, fabric and
steel or other materials, that, when mounted on an automo-
tive 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 substantiall y 90 degrees to the centerline
of the tread
Reinforced tireA 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 sidewalls of
an inflated tire, excluding elevations due to labeling, decora-
tion, or protective bands
SidewallThat portion of a tire between the tread and bead
Sidewall separationThe parting of the rubber comp ound 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-Cov-
ered Surfaces, and which is ma rked with an Alpine Symbol
( ) on at least one sidewall
Test rimThe rim on which a tire is fitt ed for testing, and may be any
rim listed as appropriate for use with that tire
TreadThat portion of a tire that comes into contact with the road
Tread ribA tread section running circ umferentially 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
Tire related termMeaning