6-1. Specifications
■ Toyota does not recommend gasoline containing MMT
Some gasoline contains octane enhancing additive called MMT
(Methylcyclopentadienyl Manganese Tricarbonyl).
Toyota does not recommend the use of gasoline that contains MMT. If fuel containing MMT is used, your emission control system may be adversely affected.
The malfunction indicator lamp on the instrument cluster may come on. If this happens, contact your Toyota dealer for service.
NOTICE
■ Notice on fuel quality
● Do not use improper fuels.
If improper fuels are used the engine will be damaged.
● Do not use leaded gasoline.
Leaded gasoline can cause damage to your vehicle’s three-way catalytic converters causing the emission control system to malfunction.
● Do not use gasohol other than that stated here.
Other gasohol may cause fuel system damage or vehicle performance problems.
● Using unleaded gasoline with an octane number or rating lower than the level previously stated will cause persistent heavy knocking.
At worst, this will lead to engine damage.
■ Fuel-related poor driveability
If after using a different type of fuel, poor driveability is encountered (poor hot starting, vaporization, engine knocking, etc.), discontinue the use of that type of fuel.
■ When refueling with gasohol
Take care not to spill gasohol.
It can damage your vehicle’s paint.
6
539
6-1. Specifications
Tire information
Typical tire symbols
540
Tire size
DOT and Tire Identification Number (TIN)
Location of treadwear indicators
Tire ply composition and materials
(
(
(
P. 542)
P. 541)
P. 422)
Plies are layers of rubber-coated parallel cords. Cords are the strands which form the plies in a tire.
Uniform tire quality grading
For details, see “Uniform tire quality grading” that follows.
Load limit at maximum cold tire inflation pressure (
P. 545)
Maximum cold tire inflation pressure (
P. 545)
This means the pressure to which a tire may be inflated.
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 pressure.
6-1. Specifications
Radial tires or bias-ply tires
A radial tire has RADIAL on the sidewall. A tire not marked RADIAL is a bias-ply tire.
Summer tire or all season tire (
P. 426)
An all season tire has M+S on the sidewall. A tire not marked M+S is a summer tire.
Typical DOT and tire identification number (TIN)
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 certifies that the tire conforms to applicable Federal Motor
Vehicle Safety Standards.
6
541
6-1. Specifications
Tire size
■ Typical tire size information
The illustration indicates typical tire size.
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)
Wheel diameter (inches)
Load index (2 digits or 3 digits)
Speed symbol
(alphabet with one letter)
■ Tire dimensions
Section width
Tire height
Wheel diameter
542
6-1. Specifications
Tire section names
Bead
Sidewall
Shoulder
Tread
Belt
Inner liner
Reinforcing rubber
Carcass
Rim lines
Bead wires
Chafer
Uniform Tire Quality Grading
This information has been prepared in accordance with regulations issued by the National Highway Traffic Safety Administration of the
U.S.A. Department of Transportation.
It provides the purchasers and/or prospective purchasers of Toyota vehicles with information on uniform tire quality grading.
Your Toyota dealer will help answer any questions you may have as you read this information.
■
DOT quality grades
All passenger vehicle tires must conform 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
6
543
6-1. Specifications
■
Treadwear
The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions 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 performance of tires depends upon the actual conditions of their use, however, and may depart significantly from the norm due to variations 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 controlled conditions on specified government 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 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 failure.
The grade C corresponds to a level of performance which all passenger car tires must meet under the Federal 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.
544
6-1. Specifications
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 term
Cold tire inflation pressure
Maximum inflation pressure
Recommended inflation pressure
Accessory weight
Curb weight
Maximum loaded vehicle weight
Meaning
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
The maximum cold inflated pressure to which a tire may be inflated, shown on the sidewall of the tire
Cold tire inflation pressure recommended by a manufacturer
The combined weight (in excess of those standard items which may be replaced) of transmission, 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)
The weight of a motor vehicle with standard equipment, including the maximum capacity of fuel, oil and coolant, and if so equipped, air conditioning and additional weight optional engine
The sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options weight
6
545
6-1. Specifications
Tire related term
Normal occupant weight
Occupant distribution
Production options weight
Rim
Meaning
150 lb. (68 kg) times the number of occupants specified in the second column of Table 1 * that follows
Distribution of occupants in a vehicle as specified in the third column of Table 1 * below
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
A metal support for a tire or a tire and tube assembly upon which the tire beads are seated
Rim diameter
(Wheel diameter)
Rim size designation
Rim type designation
Rim width
Vehicle capacity weight (Total load capacity)
Vehicle maximum load on the tire
Vehicle normal load on the tire
Nominal diameter of the bead seat
Rim diameter and width
The industry manufacturer's designation for a rim by style or code
Nominal distance between rim flanges
The rated cargo and luggage load plus 150 lb.
(68 kg) times the vehicle's designated seating capacity
The load on an individual tire that is determined by distributing to each axle its share of the maximum loaded vehicle weight, and dividing by two
The load on an individual tire that is determined by distributing 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
546
6-1. Specifications
Tire related term
Weather side
Bead
Bead separation
Bias ply tire
Carcass
Chunking
Cord
Cord separation
Cracking
CT
Extra load tire
Groove
Innerliner
Meaning
The surface area of the rim not covered by the inflated tire
The part of the tire that is made of steel wires, wrapped or reinforced by ply cords and that is shaped to fit the rim
A breakdown of the bond between components in the bead
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
The tire structure, except tread and sidewall rubber which, when inflated, bears the load
The breaking away of pieces of the tread or sidewall
The strands forming the plies in the tire
The parting of cords from adjacent rubber compounds
Any parting within the tread, sidewall, or innerliner of the tire extending to cord material
A pneumatic tire with an inverted flange tire and rim system in which the rim is designed with 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
A tire designed to operate at higher loads and at higher inflation pressures than the corresponding standard tire
The space between two adjacent tread ribs
The layer(s) forming the inside surface of a tubeless tire that contains the inflating medium within the tire
547
6
6-1. Specifications
Tire related term
Innerliner separation
Intended outboard sidewall
Light truck (LT) tire
Load rating
Maximum load rating
Maximum permissible inflation pressure
Measuring rim
Open splice
Outer diameter
Overall width
Passenger car tire
Meaning
The parting of the innerliner from cord material in the carcass
(a)The sidewall that contains a whitewall, bears white lettering, or bears manufacturer, brand, and/or model name molding that is higher or deeper than the same molding on the other sidewall of the tire, or
(b)The outward facing sidewall of asymmetrical tire that has a particular side that must always face outward when mounted on a vehicle
A tire designated by its manufacturer as primarily intended for use on lightweight trucks or multipurpose passenger vehicles
The maximum load that a tire is rated to carry for a given inflation pressure
The load rating for a tire at the maximum permissible inflation pressure for that tire
The maximum cold inflation pressure to which a tire may be inflated
The rim on which a tire is fitted for physical dimension requirements
Any parting at any junction of tread, sidewall, or innerliner that extends to cord material
The overall diameter of an inflated new tire
The linear distance between the exteriors of the sidewalls of an inflated tire, including elevations due to labeling, decorations, or protective bands or ribs
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
548
6-1. Specifications
Ply
Tire related term
Ply separation
Pneumatic tire
Radial ply tire
Reinforced tire
Section width
Sidewall
Sidewall separation
Snow tire
Test rim
Meaning
A layer of rubber-coated parallel cords
A parting of rubber compound between adjacent plies
A mechanical device made of rubber, chemicals, fabric 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
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
A tire designed to operate at higher loads and at higher inflation pressures than the corresponding standard tire
The linear distance between the exteriors of the sidewalls of an inflated tire, excluding elevations due to labeling, decoration, or protective bands
That portion of a tire between the tread and bead
The parting of the rubber compound from the cord material in the sidewall
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
The rim on which a tire is fitted for testing, and may be any rim listed as appropriate for use with that tire
549
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