Scion iA. Service Manual - part 34

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7-7. Tire Information (U.S.A.)

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If your tire size does not begin with a letter this may mean it is designated
by either ETRTO (European Tire and Rim Technical Organization) or
JATMA (Japan Tire Manufacturing Association).

Please refer to the sample below.

Temporary tires

Nominal width of tire in millime-
ters

Ratio of height to width (aspect
ratio)

Diagonal

Rim diameter code

Load index & speed symbol

T115/70D16 90M is an example of a tire size and load index rating.
Here is an explanation of the various components of that tire size and
load index rating. Note that the tire size and load index rating may be
different from the example.
● T

Indicates a tire that may be installed on cars, SUVs, minivans and
light trucks as designated by the Tire and Rim Association (T&RA).

● 115

“115” is the nominal width of the tire in millimeters. This three-digit
number gives the width in millimeters of the tire from sidewall edge
to sidewall edge. In general, the larger the number, the wider the
tire.

● 70

“70” is the aspect ratio. This two-digit number indicates the tire’s
ratio of height to width.

● D

“D” is the tire construction symbol. D indicates “diagonal ply con-
struction”.

● 16

“16” is the wheel rim diameter in inches.

Information on Temporary Tires

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5
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7-7. Tire Information (U.S.A.)

● 90

“90” is the Load Index. This two-or three-digit number indicates how
much weight each tire can support.

● M

“M” is the speed rating. The speed rating denotes the maximum
speed for which the use of the tire is rated.

Letter Rating

Speed Rating

M

81 mph

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7-7. Tire Information (U.S.A.)

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Location of the Tire Label (Placard)

You will find the tire label containing tire inflation pressure by tire size
and other important information on the driver’s side B-pillar or on the
edge of the driver’s door frame.

SAMPLE

On the tire label you will find the recommended tire inflation pressure
in both kPa and psi for the tires installed as original equipment on the
vehicle. It is very important that the inflation pressure of the tires on
your vehicle is maintained at the recommended pressure. You should
check the tire pressure regularly to insure that the proper inflation
pressure is maintained.

Refer to Tires on P. 570.

Tire pressures listed on the vehicle placard or tire information label indi-
cate the recommended cold tire inflation pressure, measured when the
tires are cold, after the vehicle has been parked for at least 3 hours. As
you drive, the temperature in the tire warms up, increasing the tire pres-
sure.

Recommended Tire Inflation Pressure

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7-7. Tire Information (U.S.A.)

When you check the air pressure, make sure the tires are cold -
meaning they are not hot from driving even a mile.

Remove the cap from the valve on one tire.

Firmly press a tire gauge onto the valve.

Add air to achieve recommended air pressure.

If you overfill the tire, release air by pushing on the metal stem in
the center of the valve. Then recheck the pressure with your tire
gauge.

Replace the valve cap.

Repeat with each tire, including the spare.

Visually inspect the tires to make sure there are no nails or other
objects embedded that could poke a hole in the tire and cause an
air leak.

Check the sidewalls to make sure there are no gouges, cuts,
bulges, cracks or other irregularities.

Some spare tires require higher inflation pressure.

WARNING

■

Always check the tire inflation pressures on a regular basis accord-
ing to the recommended tire inflation pressure on the tire label and
in conjunction with the information in this owner’s manual
Driving your vehicle with under-inflated tires is dangerous.

Under-inflation is the most common cause of failures in any kind of tire
and may result in severe cracking, tread separation or “blowout”, with
unexpected loss of vehicle control and increased risk of injury. Under-
inflation increases sidewall flexing and rolling resistance, resulting in
heat buildup and internal damage to the tire. It results in unnecessary
tire stress, irregular wear, loss of control and accidents. A tire can lose
up to half of its air pressure and not appear to be flat!

It is impossible to determine whether or not tires are properly inflated
just by looking at them.

Checking Tire Pressure

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● Tire Placard: A label indicating the OE tire sizes, recommended

inflation pressure, and the maximum weight the vehicle can carry.

● Tire Identification Number (TIN): A number on the sidewall of each

tire providing information about the tire brand and manufacturing
plant, tire size, and date of manufacture.

● Inflation Pressure: A measure of the amount of air in a tire.
● kPa: Kilopascal, the metric unit for air pressure.
● psi: Pounds per square inch, the English unit for air pressure.
● B-pillar: The structural member at the side of the vehicle behind the

front door.

● Original Equipment (OE): Describes components originally

equipped on the vehicle.

● Vehicle Load Limit: The maximum value of the combination weight

of occupants and cargo.

● Bead Area of the Tire: Area of the tire next to the rim.
● Sidewall Area of the Tire: Area between the bead area and the

tread.

● Tread Area of the Tire: Area on the perimeter of the tire that con-

tacts the road when it’s mounted on the vehicle.

● Seating capacity means the total allowable number of vehicle occu-

pants. Seating capacity is described on the tire label.

● Production options weight is the combination  weight of installed

regular production options weighing over 2.3 kilograms in excess of
the standard items which they replace, and not previously consid-
ered in the curb weight or accessory weight, including heavy duty
brakes, ride levelers, roof rack, heavy duty battery, and special trim.

● Rim is the metal support (wheel) for a tire or a tire and tube assem-

bly upon which the tire beads are seated.

Glossary of Terms

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7-7. Tire Information (U.S.A.)

Tire Maintenance

Improper or inadequate vehicle maintenance can cause tires to wear
abnormally. Here are some important maintenance points:

Inspect all tire pressure monthly (including the spare) when the tires
are cold. Maintain recommended pressures for the best ride, top han-
dling, and minimum tire wear. Use the pressures specified on the
vehicle tire information placard or tire label for optimum service.

To equalize tire wear and extend
tire life, Scion recommends that
tire rotation is carried out at the
same interval as tire inspection.

Inspect the tires for uneven wear and damage. Abnormal wear is usu-
ally caused by one or a combination of the following:
● Incorrect tire pressure
● Improper wheel alignment
● Out-of-balance wheel
● Severe braking
After rotation, inflate all tire pressures to specification (

P. 570) and

inspect the lug nuts for tightness.

Tire Inflation Pressure

Tire Rotation

Do not include (TEMPORARY 
USE ONLY) spare tire in rotation.

Forward

NOTICE

Rotate unidirectional tires and radial tires that have an asymmetrical
tread pattern or studs only from front to rear, not from side to side. Tire
performance will be weakened if rotated from side to side.

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If a tire wears evenly, a wear indi-
cator will appear as a solid band
across the tread. Replace the tire
when this happens.

You should replace the tire before
the band crosses the entire tread.

Tires degrade over time, even when they are not being used on the road.
It is recommended that tires generally be replaced when they are 6 years
or older. Heat caused by hot climates or frequent high loading conditions
can accelerate the aging process. You should replace the spare tire when
you replace the other road tires due to the aging of the spare tire. The
period in which the tire was manufactured (both week and year) is indi-
cated by a 4-digit number.

Refer to Tire Labeling on P. 541.

The way you drive has a great deal to do with your tire mileage and
safety. So cultivate good driving habits for your own benefit.
● Observe posted speed limits and drive at speeds that are safe for

the existing weather conditions

● Avoid fast starts, stops and turns
● Avoid potholes and objects on the road
● Do not run over curbs or hit the tire against the curb when parking

Replacing a Tire

WARNING

■

Always use tires that are in good condition
Driving with worn tires is dangerous. Reduced braking, steering, and
traction could result in an accident.

Tread wear 
indicator

Worn tread

New tread

Safety Practices

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NOTICE

If you feel a sudden vibration or ride disturbance while driving or you
suspect your tire or vehicle has been damaged, immediately reduce
your speed. Drive with caution until you can safely pull off the road. Stop
and inspect the tire for damage. If the tire is under-inflated or damaged,
deflate it, remove the tire and rim and replace it with your spare tire. If
you cannot detect a cause, have the vehicle towed to the nearest vehi-
cle or tire dealer to have the vehicle inspected.

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7-7. Tire Information (U.S.A.)

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Vehicle Loading

This section will guide you in the proper loading of your vehicle, to
keep your loaded vehicle weight within its design rating capability.
Properly loading your vehicle will provide maximum return of vehicle
design performance. Before loading your vehicle, familiarize yourself
with the following terms for determining your vehicle’s weight ratings,
from the vehicle’s Safety Certification Label and Tire and Load Infor-
mation Label:

Base Curb Weight is the weight of the vehicle including a full tank of
fuel and all standard equipment. It does not include passengers,
cargo, or optional equipment.

Vehicle Curb Weight is the weight of your new vehicle when you
picked it up from your dealer plus any aftermarket equipment.

Payload is the combination weight of cargo and passengers that the
vehicle is designed to carry. The maximum payload for your vehicle
can be found on the Tire and Load Information label on the driver’s
door frame or door pillar. Look for “THE COMBINATION WEIGHT OF
OCCUPANTS AND CARGO SHOULD NEVER EXCEED XXX kg or
XXX lb.” for your maximum payload. The payload listed on the tire
label is the maximum payload for the vehicle as built by the assembly
plant. If any aftermarket or dealer installed equipment has been
installed on the vehicle, the weight of the equipment must be sub-
tracted from the payload listed on the tire label in order to be accurate.

PAYLOAD

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SAMPLE

Cargo Weight includes all weight added to the Base Curb Weight,
including cargo and optional equipment.

The cargo weight limit decreases depending on the number of vehicle
occupants. The cargo weight limit can be calculated by subtracting the
total weight of the vehicle occupants from the “combination weight of
occupants and cargo should never exceed” value on the tire label.

CARGO

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Examples: Based on a single occupant weight of 150 lb. (68 kg), and
a value of 849 lb. (385 kg) for the “combination weight of occupants
and cargo should never exceed”:

The cargo weight limit with one occupant is 849 lb. (385 kg) - 150 lb.
(68 kg) = 699 lb. (317 kg) 

The cargo weight limit with two occupants is 849 lb. (385 kg) - (150 x
2) lb. ((68 x 2) kg) = 549 lb. (249 kg)

If the weight of the occupant increases, the cargo weight limit
decreases by that much.

GAW (Gross Axle Weight) is the total weight placed on each axle
(front and rear) - including vehicle curb weight and all payload.

GAWR (Gross Axle Weight Rating) is the maximum allowable weight
that can be carried by a single axle (front or rear). These numbers are
shown on the Safety Compliance Certification Label located on the
driver’s door frame or door pillar. The total load on each axle must
never exceed its GAWR.

GVW (Gross Vehicle Weight) is the Vehicle Curb Weight + cargo +
passengers.

GVWR (Gross Vehicle Weight Rating) is the maximum allowable
weight of the fully loaded vehicle (including all options, equipment,
passengers and cargo). The GVWR is shown on the Safety Compli-
ance Certification Label located on the driver’s door frame or door pil-
lar. The GVW must never exceed the GVWR.

GVW

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SAMPLE

GCW (Gross Combination Weight) is the weight of the loaded vehicle
(GVW).

GCW

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GCWR (Gross Combination Weight Rating) is the maximum allowable
weight of the vehicle - including all cargo and passengers - that the
vehicle can handle without risking damage. The GCW must never
exceed the GCWR.

WARNING

■

Do not tow a trailer with this vehicle
Towing a trailer with this vehicle is dangerous because it has not been
designed to tow a trailer and doing so will affect the drive system which
could result in vehicle damage.

■

Overloaded Vehicle
Overloading a vehicle is dangerous. The results of overloading can
have serious consequences in terms of passenger safety. Too much
weight on a vehicle’s suspension system can cause spring or shock
absorber failure, brake failure, handling or steering problems, irregular
tire wear, tire failure or other damage.

Overloading makes a vehicle harder to drive and control. It also
increases the distance required for stopping. In cases of serious over-
loading, brakes can fail completely, particularly on steep grades. The
load a tire will carry safely is a combination of the size of the tire, its load
range, and corresponding inflation pressure.

Never overload the vehicle and always observe the vehicle’s weight rat-
ings from the vehicle’s Safety Certification and Tire and Load Informa-
tion labels.

■

Never Exceed Axle Weight Rating Limits
Exceeding the Safety Certification Label axle weight rating limits is dan-
gerous and could result in death or serious injury as a result of substan-
dard vehicle handling, performance, engine, transmission and/or
structural damage, serious damage to the vehicle, or loss of control.

Always keep the vehicle within the axle weight rating limits.

■

Never Exceed GVWR or GAWR Specifications
Exceeding the GVWR or the GAWR specified on the certification label is
dangerous. Exceeding any vehicle rating limitation could result in a seri-
ous accident, injury, or damage to the vehicle.

Do not use replacement tires with lower load carrying capacities than
the originals because they may lower the vehicle’s GVWR and GAWR
limitations. Replacement tires with a higher limit than the originals do
not increase the GVWR and GAWR limitations. Never exceed the
GVWR or the GAWR specified on the certification label.

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Steps for Determining the Correct Load 

Limit

Steps for Determining Correct Load Limit-

(1)

Locate the statement “The combined weight of occupants and
cargo should never exceed XXX kg or XXX lbs.” on your vehicle’s
placard.

(2)

Determine the combined weight of the driver and passengers that
will be riding in your vehicle.

(3)

Subtract the combined weight of the driver and passengers from
XXX kg or XXX lbs.

(4)

The resulting figure equals the available amount of cargo and lug-
gage load capacity. For example, if the “XXX” amount equals 1400
lbs. and there will be five 150 lb passengers in your vehicle, the
amount of available cargo and luggage load capacity is 650 lbs.
(1400 - 750 (5 x 150) = 650 lbs.)

(5)

Determine the combined weight of luggage and cargo being loaded
on the vehicle. That weight may not safely exceed the available
cargo and luggage load capacity calculated in Step 4.

(6)

If your vehicle will be towing a trailer, load from your trailer will be
transferred to your vehicle. Consult this manual to determine how
this reduces the available cargo and luggage load capacity of your
vehicle.

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7-8. Declaration of Conformity

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Declaration of Conformity

Keyless Entry System/Immobilizer System

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7-8. Declaration of Conformity

■

Type A



For vehicles sold in the U.S.A. and Canada

FCC ID: CB2MBLUEC09 IC:279B-MBLUEC09

This device complies with Part 15 of the FCC Rules and with RSS-
210 of Industry Canada.

Operation is subject to the following two conditions:

(1)

This device may not cause harmful interference, and

(2)

This device must accept any interference received, including
interference that may cause undesired operation.

The term “IC: ” before the radio certification number only signifies
that Industry Canada technical specifications were met.

The antenna used for this transmitter must not be co-located or
operating in conjunction with any other antenna or transmitter. End-
users and installers must be provided with installation instructions
and transmitter operating conditions for satisfying RF exposure
compliance.



Scion Customer Experience

● U.S.A.

Phone: 1-866-70-SCION or 1-866-707-2466 (Toll-free) 
Web: http://www.scion.com/BeSpoke

● Canada

Phone: 1-888-TOYOTA-8 or 1-888-869-6828 (Toll-free) 
Web: www.toyota.ca

Bluetooth

®

 Hands-Free

WARNING

Changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.