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Dodge Diesel (2004 year). Manual - part 16

Tire Sizing Chart

EXAMPLE:

Size Designation:

= Passenger car tire size based on U.S. design standards

(....blank....( = Passenger car tire based on European design standards
LT

= Light Truck tire based on U.S. design standards

= Temporary Spare tire

= Overall Diameter in Inches (in)

215

= Section Width in Milimeters (mm)

= Aspect Ratio in Percent (%)

—Ratio of section height to section width of tire.

10.5

= Section Width in Inches (in)

= Construction Code

—

9R9 means Radial Construction.

—

9D9 means Diagonal or Bias Construction.

= Rim Diameter in Inches (in)

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EXAMPLE:

Service Description:

= Load Index

—A numerical code associated with the maximum load a tire can carry.

= Speed Symbol

—A symbol indicating the range of speeds at which a tire can carry a load corresponding
to its load index under certain operating conditions.
—The maximum speed corresponding to the Speed Symbol should only be achieved un-
der specified operating conditions. (ie. tire pressure, vehicle loading, road conditions and
posted speed limits).

Load Identification:

(....blank....( = Absence of any text on sidewall of the tire indicates a Standard Load (SL) Tire
Extra Load (XL)

= Extra Load (or Reinforced) Tire

Light Load

= Light Load Tire

C,D,E

= Load range associated with the maximum load a tire can carry at a specified pressure

Maximum Load

— Maximum Load indicates the maximum load this tire is designed to carry.

Maximum Pressure

— Maximum Pressure indicates the maximum permissible cold tire inflation pressure for this tire.

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Tire Identification Number (TIN)

The TIN may be found on one or both sides of the tire
however the date code may only be on one side. Tires
with white sidewalls will have the full TIN including
date code located on the white sidewall side of the tire.

Look for the TIN on the outboard side of black sidewall
tires as mounted on the vehicle. If the TIN is not found on
the outboard side then you will find it on the inboard side
of the tire.

EXAMPLE:

DOT MA L9 ABCD 0301

DOT

= Department of Transportation

—This symbol certifies that the tire is in compliance with the U.S. Department of Transportation tire

safety standards, and is approved for highway use.

= Code representing the tire manufacturing location.(2 digits)

= Code representing the tire size.(2 digits)

ABCD

= Code used by tire manufacturer.(1 to 4 digits)

= Number representing the week in which the tire was manufactured.(2 digits)

—03 means the 3rd week.

= Number representing the year in which the tire was manufactured.(2 digits)

—01 means the year 2001.
—Prior to July 2000, tire manufacturers were only required to have 1 number to represent the year in

which the tire was manufactured. Example: 031 could represent the 3rd week of 1981 or 1991.

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Tire Loading and Tire Pressure

Tire Placard Location

NOTE:

Some vehicles have a “Tire and Loading Infor-

mation” placard located on the driver’s side “B” pillar.

Tire and Loading Information Placard

This placard tells you important information about the,
1) number of people that can be carried in the vehicle
2) the total weight your vehicle can carry
3) the tire size designed for your vehicle
4) the cold tire inflation pressures for the front, rear
and spare tires.

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Loading
The vehicle maximum load on the tire must not exceed
the load carrying capacity of the tire on your vehicle. You
will not exceed the tire’s load carrying capacity if you
adhere to the loading conditions, tire size and cold tire
inflation pressures specified on the Tire and Loading
Information placard and the Vehicle Loading section of
this manual.

NOTE:

Under a maximum loaded vehicle condition,

gross axle weight ratings (GAWR’s) for the front and rear
axles must not be exceeded. For further information on
GAWR’s, vehicle loading and trailer towing, see the
Vehicle Loading section of this manual.

To determine the maximum loading conditions of your
vehicle, locate the statement “The combined weight of
occupants and cargo should never exceed XXX kg or XXX
lbs.” on the Tire and Loading Information placard. The

combined weight of occupants, cargo/luggage and
trailer tongue weight (if applicable) should never exceed
the weight referenced here.

Steps for Determining Correct Load Limit

1. Locate the statement “The combined weight of occu-
pants and cargo should never exceed XXX pounds” 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 pas-
sengers from XXX kilograms or XXX pounds.

4. The resulting figure equals the available amount of
cargo and luggage load capacity. For example, if “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 lb. (1400–750 (5 x 150) =
650 lb.)

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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.

NOTE:

The following table shows examples on how to

calculate total load, cargo/luggage and towing capacities
of your vehicle with varying seating configurations and
number and size of occupants. This table is for illustra-
tion purposes only and may not be accurate for the
seating and load carry capacity of your vehicle.

NOTE:

For the following example the combined weight

of occupants and cargo should never exceed 865 lbs. (392
Kg).

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WARNING!

Overloading of your tire is dangerous. Overloading
can cause tire failure, affect vehicle handling, and
increase your stopping distance. Use tires of the
recommended load capacity for your vehicle. Never
overload them.

TIRES—GENERAL INFORMATION

Tire Pressure

Proper tire inflation pressure is essential to the safe and
satisfactory operation of your vehicle. Three primary
areas are affected by improper tire pressure:

1. Safety—

WARNING!

Improperly inflated tires are dangerous and can
cause accidents.
• Under inflation increases tire flexing and can result

in tire failure.
• Over inflation reduces a tire’s ability to cushion

shock. Objects on the road and chuck holes can cause
damage that results in tire failure.
• Unequal tire pressures can cause steering prob-

lems. You could lose control of your vehicle.
• Over inflated or under inflated tires can affect

vehicle handling and can fail suddenly, resulting in
loss of vehicle control.
• Unequal tire pressures from one side of the vehicle

to the other can cause the vehicle to drift to the right
or left.
Always drive with each tire inflated to the recom-
mended cold tire inflation pressure.

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251

2. Economy—
Improper inflation pressures can cause uneven wear
patterns to develop across the tire tread. These abnormal
wear patterns will reduce tread life resulting in a need for
earlier tire replacement. Underinflation also increases tire
rolling resistance and results in higher fuel consumption.

3. Ride Comfort and Vehicle Stability—
Proper tire inflation contributes to a comfortable ride.
Overinflation produces a jarring and uncomfortable ride.

Tire Inflation Pressures

The proper cold tire inflation pressure for passenger cars
is listed on either the face of the driver’s door or the
driver’s side “B” pillar. For vehicles other than passenger
cars, the cold tire inflation pressures are listed on either
the “B” pillar, the Certification Label or in the Tire
Inflation Pressures brochure in the glove compartment.

Some vehicles may have Supplemental Tire Pressure
Information for vehicle loads that are less than the

maximum loaded vehicle condition. These pressure con-
ditions will be found in the “Supplemental Tire Pressure
Information” section of this manual.

The pressure should be checked and adjusted as well as
inspecting for signs of tire wear or visible damage at least
once a month. Use a good quality pocket-type gauge to

“B” PILLAR

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check tire pressure. Do not make a visual judgement
when determining proper inflation. Radial tires may look
properly inflated even when they are underinflated.

CAUTION!

After inspecting or adjusting the tire pressure al-
ways reinstall the valve stem cap–if equipped. This
will prevent moisture and dirt from entering the
valve stem, which could damage the valve stem.

Inflation pressures specified on the placard are always
“cold tire inflation pressure”. Cold tire inflation pressure
is defined as the tire pressure after the vehicle has not
been driven for at least 3 hours, or driven less than 1mile
(1 km) after a 3 hour period. The cold tire inflation
pressure must not exceed the maximum inflation pres-
sure molded into the tire side wall.

Check tire pressures more often if subject to a wide range
of outdoor temperatures, as tire pressures vary with
temperature changes.

Tire pressures change by approximately 1 psi (7 kPa) per
12° F (7° C) of air temperature change. Keep this in mind
when checking tire pressure inside a garage especially in
the winter.

Example: If garage temperature = 68° F (20° C) and the
outside temperature = 32° F (0° C) then the cold tire
inflation pressure should be increased by 3 psi (21 kPa),
which equals 1 psi (7 kPa) for every 12° F (7° C) for this
outside temperature condition.

Tire pressure may increase from 2 to 6 psi (13 to 40 kPa)
during operation. DO NOT reduce this normal pressure
build up or your tire pressure will be too low.

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Tire Pressures for High Speed Operation
The manufacturer advocates driving at safe speeds
within posted speed limits. Where speed limits or condi-
tions are such that the vehicle can be driven at high
speeds, maintaining correct tire inflation pressure is very
important. Increased tire pressure and reduced vehicle
loading may be required for high speed vehicle opera-
tion. Refer to original equipment or an authorized tire
dealer for recommended safe operating speeds, loading
and cold tire inflation pressures.

WARNING!

High speed driving with your vehicle under maxi-
mum load is dangerous. The added strain on your
tires could cause them to fail. You could have a
serious accident. Don’t drive a vehicle loaded to the
maximum capacity at continuous speeds above 75
mph (120 km/h).

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Radial-Ply Tires

WARNING!

Combining radial ply tires with other types of tires
on your vehicle will cause your vehicle to handle
poorly. The instability could cause an accident. Al-
ways use radial ply tires in sets of four (or 6, in case
of trucks with dual rear wheels). Never combine
them with other types of tires.

Cuts and punctures in radial tires are repairable only in
the tread area because of sidewall flexing. Consult your
authorized tire dealer for radial tire repairs.

Compact Spare Tire — If Equipped

The compact spare is for temporary emergency use with
radial tires. It is engineered to be used on your style
vehicle only. Since this tire has limited tread life, the
original tire should be repaired (or replaced) and rein-
stalled at the first opportunity.

WARNING!

Temporary use spare tires are for emergency use
only. With these tires, do not drive more than 50 mph
(80 km/h). Temporary-use spare tires have limited
tread life. When two or more tread wear indicators
appear in adjacent grooves, the temporary use spare
tire needs to be replaced. Be sure to follow the
warnings which apply to your spare. Failure to do so
could result in spare tire failure and loss of vehicle
control.

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Do not install a wheel cover or attempt to mount a
conventional tire on the compact spare wheel, since the
wheel is designed specifically for the compact spare.

Do not install more than one compact spare tire/wheel
on the vehicle at any given time.

CAUTION!

Because of the reduced ground clearance, do not take
your vehicle through an automatic car wash with the
compact spare installed. Damage to the vehicle may
result.

Tire Spinning

When stuck in mud, sand, snow, or ice conditions, do not
spin your vehicle’s wheels above 35 mph (55 km/h).

See the paragraph on Freeing A Stuck Vehicle in Section
6 of this manual.

WARNING!

Fast spinning tires can be dangerous. Forces gener-
ated by excessive wheel speeds may cause tire dam-
age or failure. A tire could explode and injure
someone. Do not spin your vehicle’s wheels faster
than 35 mph (55 km/h) when you are stuck. And
don’t let anyone near a spinning wheel, no matter
what the speed.

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Tread Wear Indicators

Tread wear indicators are in the original equipment tires
to help you in determining when your tires should be
replaced.

These indicators are molded into the bottom of the tread
grooves and will appear as bands when the tread depth
becomes 1/16 inch (2 mm). When the indicators appear
in 2 or more adjacent grooves, the tire should be replaced.

Many states have laws requiring tire replacement at this
point.

Replacement Tires

The tires on your new vehicle provide a balance of many
characteristics. They should be inspected regularly for
wear and correct cold tire inflation pressure. The manu-
facturer strongly recommends that you use tires equiva-
lent to the originals in size, quality and performance
when replacement is needed (see the paragraph on tread
wear indicators). Refer to the Tire and Loading Informa-
tion placard for the size designation of your tire. The
service description and load identification will be found
on the original equipment tire. Failure to use equivalent
replacement tires may adversely affect the safety, han-
dling, and ride of your vehicle. We recommend that you
contact your original equipment or an authorized tire
dealer with any questions you may have on tire specifi-
cations or capability.

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WARNING!

• Do not use a tire, wheel size or rating other than

that specified for your vehicle. Some combina-
tions of unapproved tires and wheels may change
suspension dimensions and performance charac-
teristics, resulting in changes to steering, han-
dling, and braking of your vehicle. This can cause
unpredictable handling and stress to steering and
suspension components. You could lose control
and have an accident resulting in serious injury or
death. Use only the tire and wheel sizes with load
ratings approved for your vehicle.

• Never use a tire with a smaller load index or

capacity, other than what was originally equipped
on your vehicle. Using a tire with a smaller load
index could result in tire overloading and failure.
You could lose control and have an accident.

• Failure to equip your vehicle with tires having

adequate speed capability can result in sudden
tire failure and loss of vehicle control.

CAUTION!

Replacing original tires with tires of a different size
may result in false speedometer and odometer read-
ings.

Alignment And Balance

Poor suspension alignment may result in:

• Fast tire wear.
• Uneven tire wear, such as feathering and one-sided

wear.

• Vehicle pull to right or left.

Tires may also cause the vehicle to pull to the left or right.
Alignment will not correct this condition. See your dealer
for proper diagnosis.

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Improper alignment will not cause vehicle vibration.
Vibration may be a result of tire and wheel out-of-
balance. Proper balancing will reduce vibration and
avoid tire cupping and spotty wear.

SUPPLEMENTAL TIRE PRESSURE INFORMATION

A light load vehicle condition is defined as two passen-
gers {150 lbs (68 kg) each} plus 200 lbs (91kg) of cargo.
Cold tire inflation pressures for a lightly loaded vehicle
will be found on a “Supplemental Tire Pressure Inflation”
label located on the face of the driver’s door or in the Tire
Information Pressures pamphlet in the glove box.

TIRE CHAINS

Use “Class U” chains on 2500/3500 Ram Trucks, or other
traction aids that meet SAE Type “U” specifications.

NOTE:

Chains must be the proper size for the vehicle,

as recommended by the chain manufacturer.

CAUTION!

To avoid damage to your vehicle, tires or chains, observe
the following precautions:

•

Because of limited chain clearance between tires and other
suspension components, it is important that only chains
in good condition are used. Broken chains can cause
serious vehicle damage. Stop the vehicle immediately if
noise occurs that could suggest chain breakage. Remove
the damaged parts of the chain before further use.

•

Install chains as tightly as possible and then retighten
after driving about 1/2 mile (0.8 km).

•

Do not exceed 45 mph (72 km/h).

•

Drive cautiously and avoid severe turns and large
bumps, especially with a loaded vehicle.

•

Do not install tire chains on front wheels of 4x2 vehicles.

•

Do not drive for a prolonged period on dry pavement.

•

Observe the tire chain manufacturer’s instructions on
method of installation, operating speed, and conditions
for usage. Always use the lower suggested operating
speed of the chain manufacturer if different than the
speed recommended by the manufacturer.

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