RAM 3500 Chassis Cab (2021 year). Manual in english — page 26

410

SERVICING AND MAINTENANCE

Tire Terminology And Definitions

Term

Definition

B-pillar

The vehicle B-pillar is the structural member of the body located behind the front door.

Cold Tire Inflation Pressure

Cold tire inflation pressure is defined as the tire pressure after the vehicle has not been

driven for at least three hours, or driven less than 1 mile (1.6 km) after sitting for a

minimum of three hours. Inflation pressure is measured in units of PSI (pounds per

square inch) or kPa (kilopascals).

Maximum Inflation Pressure

The maximum inflation pressure is the maximum permissible cold tire inflation pressure

for this tire. The maximum inflation pressure is molded into the sidewall.

Recommended Cold Tire Inflation Pressure

Vehicle manufacturer's recommended cold tire inflation pressure as shown on the tire

placard.

Tire Placard

A label permanently attached to the vehicle describing the vehicle’s loading capacity, the

original equipment tire sizes and the recommended cold tire inflation pressures.

SERVICING AND MAINTENANCE

411

Tire Loading And Tire Pressure

NOTE:

The proper cold tire inflation pressure is listed

on the driver’s side B-pillar or the rear edge of

the driver's side door.

Check the inflation pressure of each tire,

including the spare tire (if equipped), at least

monthly and inflate to the recommended

pressure for your vehicle.

Example Tire Placard Location (Door)

Example Tire Placard Location (B-pillar)

Tire And Loading Information Placard

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. Total weight your vehicle can carry.

3. Tire size designed for your vehicle.

4. Cold tire inflation pressures for the front,

rear, and spare tires.

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

Ú

page 199.

NOTE:

Under a maximum loaded vehicle condition,

gross axle weight ratings (GAWRs) for the front

and rear axles must not be exceeded.

8

412

SERVICING AND MAINTENANCE

For further information on GAWRs, vehicle

loading, and trailer towing, refer to “Vehicle

Loading” in the “Starting And Operating”

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 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 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 lbs.

(1400-750 (5x150) = 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.

Metric Example For Load Limit
For example, if “XXX” amount equals 635 kg

and there will be five 68 kg passengers in your

vehicle, the amount of available cargo and

luggage load capacity is 295 kg (635-340

(5x68) = 295 kg) as shown in step 4.

NOTE:



If your vehicle will be towing a trailer, load from

your trailer will be transferred to your vehicle.

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 illustration

purposes only and may not be accurate for the

seating and load carry capacity of your vehicle.



For the following example, the combined

weight of occupants and cargo should never

exceed 865 lbs (392 kg).

SERVICING AND MAINTENANCE

413

8

414

SERVICING AND MAINTENANCE

T

IRES

— G

ENERAL

I

NFORMATION

Tire Pressure

Proper tire inflation pressure is essential to the

safe and satisfactory operation of your vehicle.

Four primary areas are affected by improper tire

pressure:



Safety



Fuel Economy



Tread Wear



Ride Comfort and Vehicle Stability

Safety

Both underinflation and overinflation affect the

stability of the vehicle and can produce a feeling

of sluggish response or over responsiveness in

the steering.

NOTE:



Unequal tire pressures from side to side may

cause erratic and unpredictable steering

response.



Unequal tire pressure from side to side may

cause the vehicle to drift left or right.

Fuel Economy
Underinflated tires will increase tire rolling

resistance resulting in higher fuel consumption.
Tread Wear
Improper cold tire inflation pressures can cause

abnormal wear patterns and reduced tread life,

resulting in the need for earlier tire

replacement.
Ride Comfort And Vehicle Stability
Proper tire inflation contributes to a

comfortable ride. Overinflation produces a

jarring and uncomfortable ride.

WARNING!

Overloading of your tires 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.

WARNING!



Improperly inflated tires are dangerous and

can cause collisions.



Underinflation increases tire flexing and

can result in overheating and tire failure.



Overinflation reduces a tire's ability to

cushion shock. Objects on the road and

chuckholes can cause damage that result

in tire failure.



Overinflated or underinflated tires can

affect vehicle handling and can fail

suddenly, resulting in loss of vehicle

control.



Unequal tire pressures can cause steering

problems. You could lose control of your

vehicle.



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

recommended cold tire inflation pressure.

SERVICING AND MAINTENANCE

415

Tire Inflation Pressures

The proper cold tire inflation pressure is listed

on the driver's side B-pillar or rear edge of the

driver's side door.
At least once a month:



Check and adjust tire pressure with a good

quality pocket-type pressure gauge. Do not

make a visual judgment when determining

proper inflation. Tires may look properly

inflated even when they are underinflated.



Inspect tires for signs of tire wear or visible

damage.

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

three hours, or driven less than 1 mile (1.6 km)

after sitting for a minimum of three hours. The

cold tire inflation pressure must not exceed the

maximum inflation pressure molded into the

tire sidewall.
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.

Tire Pressures For High Speed Operation

The manufacturer advocates driving at safe

speeds and within posted speed limits. Where

speed limits or conditions 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

operation. Refer to an authorized tire dealer

or original equipment vehicle dealer for

recommended safe operating speeds, loading

and cold tire inflation pressures.

CAUTION!

After inspecting or adjusting the tire pressure,

always reinstall the valve stem cap. This will

prevent moisture and dirt from entering the valve

stem, which could damage the valve stem.

WARNING!

High speed driving with your vehicle under

maximum load is dangerous. The added strain

on your tires could cause them to fail. You

could have a serious collision. Do not drive a

vehicle loaded to the maximum capacity at

continuous speeds above 75 mph (120 km/h).

8

416

SERVICING AND MAINTENANCE

Radial Ply Tires

Tire Repair
If your tire becomes damaged, it may be

repaired if it meets the following criteria:



The tire has not been driven on when flat.



The damage is only on the tread section of

your tire (sidewall damage is not repairable).



The puncture is no greater than a ¼ of an

inch (6 mm).

Consult an authorized tire dealer for tire repairs

and additional information.
Damaged Run Flat tires, or Run Flat tires that have

experienced a loss of pressure should be replaced

immediately with another Run Flat tire of identical

size and service description (Load Index and Speed

Symbol). Replace the tire pressure sensor as well as

it is not designed to be reused.

Run Flat Tires — If Equipped

Run Flat tires allow you the capability to drive

50 miles (80 km) at 50 mph (80 km/h) after a

rapid loss of inflation pressure. This rapid loss

of inflation is referred to as the Run Flat mode.

A Run Flat mode occurs when the tire inflation

pressure is of/or below 14 psi (96 kPa). Once a

Run Flat tire reaches the Run Flat mode it has

limited driving capabilities and needs to be

replaced immediately. A Run Flat tire is not

repairable. When a Run Flat tire is changed

after driving with underinflated tire condition,

please replace the TPM sensor as it is not

designed to be reused when driven under Run

Flat mode 14 psi (96 kPa) condition.

NOTE:

TPM Sensor must be replaced after driving the

vehicle on a flat tire condition.

It is not recommended driving a vehicle loaded

at full capacity or to tow a trailer while a tire is in

the Run Flat mode.
See the tire pressure monitoring section for

more information.

Tire Spinning

When stuck in mud, sand, snow, or ice

conditions, do not spin your vehicle's wheels

above 30 mph (48 km/h) or for longer than

30 seconds continuously without stopping.

WARNING!

Combining radial ply tires with other types of tires

on your vehicle will cause your vehicle to handle

poorly. The instability could cause a collision.

Always use radial ply tires in sets of four. Never

combine them with other types of tires.

WARNING!

Fast spinning tires can be dangerous. Forces

generated by excessive wheel speeds may

cause tire damage or failure. A tire could

explode and injure someone. Do not spin your

vehicle's wheels faster than 30 mph (48 km/h)

for more than 30 seconds continuously when

you are stuck, and do not let anyone near a

spinning wheel, no matter what the speed.

SERVICING AND MAINTENANCE

417

Tread Wear Indicators

Tread wear indicators are in the original

equipment tires to help you in determining

when your tires should be replaced.

Tire Tread

These indicators are molded into the bottom of

the tread grooves. They will appear as bands

when the tread depth becomes a 1/16 of an

inch (1.6 mm). When the tread is worn to the

tread wear indicators, the tire should be

replaced.

Life Of Tire

The service life of a tire is dependent upon

varying factors including, but not limited to:



Driving style.



Tire pressure - Improper cold tire inflation pres

-

sures can cause uneven wear patterns to

develop across the tire tread. These abnormal

wear patterns will reduce tread life, resulting in

the need for earlier tire replacement.



Distance driven.



Performance tires, tires with a speed rating of

V or higher, and Summer tires typically have

a reduced tread life. Rotation of these tires

per the vehicle scheduled maintenance is

highly recommended.

NOTE:

Wheel valve stem must be replaced as well

when installing new tires due to wear and tear

in existing tires.

Keep dismounted tires in a cool, dry place with

as little exposure to light as possible. Protect

tires from contact with oil, grease, and gasoline.

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

pressures. The manufacturer strongly recommends

that you use tires equivalent to the originals in size,

quality and performance when replacement is

needed

Ú

page 417. Refer to the Tire and Loading

Information placard or the Vehicle Certification

Label for the size designation of your tire. The Load

Index and Speed Symbol for your tire will be found

on the original equipment tire sidewall.
For more information relating to the Load Index

and Speed Symbol of a tire

Ú

page 406.

It is recommended to replace the two front tires

or two rear tires as a pair. Replacing just one tire

can seriously affect your vehicle’s handling.

1 — Worn Tire
2 — New Tire

WARNING!

Tires and the spare tire should be replaced

after six years, regardless of the remaining

tread. Failure to follow this warning can result

in sudden tire failure. You could lose control

and have a collision resulting in serious injury

or death.

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418

SERVICING AND MAINTENANCE

(Continued)

If you ever replace a wheel, make sure that the

wheel’s specifications match those of the

original wheels.
It is recommended you contact an authorized

tire dealer or original equipment dealer with any

questions you may have on tire specifications

or capability. Failure to use equivalent

replacement tires may adversely affect the

safety, handling, and ride of your vehicle.

T

IRE

T

YPES

All Season Tires — If Equipped

All Season tires provide traction for all seasons

(Spring, Summer, Autumn, and Winter). Traction

levels may vary between different all season

tires. All season tires can be identified by the

M+S, M&S, M/S or MS designation on the tire

sidewall. Use all season tires only in sets of four;

failure to do so may adversely affect the safety

and handling of your vehicle.

Summer Or Three Season Tires — If

Equipped

Summer tires provide traction in both wet and

dry conditions, and are not intended to be

driven in snow or on ice. If your vehicle is

equipped with Summer tires, be aware these

tires are not designed for Winter or cold driving

conditions. Install Winter tires on your vehicle

when ambient temperatures are less than 40°F

(5°C) or if roads are covered with ice or snow.

For more information, contact an authorized

dealer.

WARNING!



Do not use a tire, wheel size, load rating, or

speed rating other than that specified for

your vehicle. Some combinations of unap

-

proved tires and wheels may change

suspension dimensions and performance

characteristics, resulting in changes to

steering, handling, and braking of your

vehicle. This can cause unpredictable

handling and stress to steering and

suspension components. You could lose

control and have a collision 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 a collision.



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 readings.

WARNING!

(Continued)

SERVICING AND MAINTENANCE

419

Summer tires do not contain the all season

designation or mountain/snowflake symbol on

the tire sidewall. Use Summer tires only in sets

of four; failure to do so may adversely affect the

safety and handling of your vehicle.

Snow Tires

Some areas of the country require the use of

snow tires during the Winter. Snow tires can be

identified by a “mountain/snowflake” symbol

on the tire sidewall.

If you need snow tires, select tires

equivalent in size and type to the

original equipment tires. Use snow

tires only in sets of four; failure to do

so may adversely affect the safety and handling

of your vehicle.

Snow tires generally have lower speed ratings

than what was originally equipped with your

vehicle and should not be operated at

sustained speeds over 75 mph (120 km/h).

For speeds above 75 mph (120 km/h) refer to

original equipment or an authorized tire dealer

for recommended safe operating speeds,

loading and cold tire inflation pressures.
While studded tires improve performance

on ice, skid and traction capability on wet or

dry surfaces may be poorer than that of

non-studded tires. Some states prohibit

studded tires; therefore, local laws should

be checked before using these tire types.

S

PARE

T

IRES

— I

F

E

QUIPPED

For restrictions when towing with a spare tire

designated for temporary emergency use

Ú

page 206.

Spare Tire Matching Original Equipped Tire

And Wheel — If Equipped

Your vehicle may be equipped with a spare tire

and wheel equivalent in look and function to the

original equipment tire and wheel found on the

front or rear axle of your vehicle. This spare tire

may be used in the tire rotation for your vehicle.

If your vehicle has this option, refer to an

authorized tire dealer for the recommended tire

rotation pattern.

Compact Spare Tire — If Equipped

The compact spare is for temporary emergency

use only. You can identify if your vehicle is

equipped with a compact spare by looking at

the spare tire description on the Tire and

Loading Information Placard located on the

driver’s side door opening or on the sidewall of

the tire. Compact spare tire descriptions begin

with the letter “T” or “S” preceding the size

designation. Example: T145/80D18 103M.
T, S = Temporary Spare Tire
Since this tire has limited tread life, the original

equipment tire should be repaired (or replaced)

and reinstalled on your vehicle at the first

opportunity.

WARNING!

Do not use Summer tires in snow/ice

conditions. You could lose vehicle control,

resulting in severe injury or death. Driving too

fast for conditions also creates the possibility

of loss of vehicle control.

CAUTION!

Because of the reduced ground clearance, do

not take your vehicle through an automatic

car wash with a compact or limited use

temporary spare installed. Damage to the

vehicle may result.

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SERVICING AND MAINTENANCE

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 tire. Do not install more than

one compact spare tire and wheel on the

vehicle at any given time.

Collapsible Spare Tire — If Equipped

The collapsible spare is for temporary

emergency use only. You can identify if your

vehicle is equipped with a collapsible spare by

looking at the spare tire description on the Tire

and Loading Information Placard located on the

driver’s side door opening or on the sidewall of

the tire.
Collapsible spare tire description example:

165/80-17 101P.
Since this tire has limited tread life, the original

equipment tire should be repaired (or replaced)

and reinstalled on your vehicle at the first

opportunity.
Inflate collapsible tire only after the wheel is

properly installed to the vehicle. Inflate the

collapsible tire using the electric air pump

before lowering the vehicle.
Do not install a wheel cover or attempt to mount

a conventional tire on the collapsible spare

wheel, since the wheel is designed specifically

for the collapsible spare tire.

Full Size Spare — If Equipped

The full size spare is for temporary emergency

use only. This tire may look like the originally

equipped tire on the front or rear axle of your

vehicle, but it is not. This spare tire may have

limited tread life. When the tread is worn to the

tread wear indicators, the temporary use full

size spare tire needs to be replaced. Since it is

not the same as your original equipment tire,

replace (or repair) the original equipment tire

and reinstall on the vehicle at the first

opportunity.

WARNING!

Compact and collapsible spares are for

temporary emergency use only. With these

spares, do not drive more than 50 mph

(80 km/h). Temporary use spares have

limited tread life. When the tread is worn to

the tread wear indicators, 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.

WARNING!

Compact and Collapsible spares are for

temporary emergency use only. With these

spares, do not drive more than 50 mph

(80 km/h). Temporary use spares have

limited tread life. When the tread is worn to

the tread wear indicators, 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.

SERVICING AND MAINTENANCE

421

Limited Use Spare — If Equipped

The limited use spare tire is for temporary

emergency use only. This tire is identified by a

label located on the limited use spare wheel.

This label contains the driving limitations for

this spare. This tire may look like the original

equipped tire on the front or rear axle of your

vehicle, but it is not. Installation of this limited

use spare tire affects vehicle handling. Since it

is not the same as your original equipment tire,

replace (or repair) the original equipment tire

and reinstall on the vehicle at the first

opportunity.

W

HEEL

A

ND

W

HEEL

T

RIM

C

ARE

All wheels and wheel trim, especially aluminum

and chrome plated wheels, should be cleaned

regularly using mild (neutral Ph) soap and water

to maintain their luster and to prevent

corrosion. Wash wheels with the same soap

solution recommended for the body of the

vehicle and remember to always wash when the

surfaces are not hot to the touch.
Your wheels are susceptible to deterioration

caused by salt, sodium chloride, magnesium

chloride, calcium chloride, etc., and other road

chemicals used to melt ice or control dust on

dirt roads. Use a soft cloth or sponge and mild

soap to wipe away promptly. Do not use harsh

chemicals or a stiff brush. They can damage the

wheel’s protective coating that helps keep them

from corroding and tarnishing.

When cleaning extremely dirty wheels including

excessive brake dust, care must be taken in the

selection of tire and wheel cleaning chemicals

and equipment to prevent damage to the wheels.

Mopar Wheel Treatment or Mopar Chrome

Cleaner or their equivalent is recommended or

select a non-abrasive, non-acidic cleaner for

aluminum or chrome wheels.

WARNING!

Limited use spares are for emergency use

only. Installation of this limited use spare tire

affects vehicle handling. With this tire, do not

drive more than the speed listed on the

limited use spare wheel. Keep inflated to the

cold tire inflation pressures listed on your Tire

and Loading Information Placard located on

the driver’s side B-pillar or the rear edge of

the driver’s side door. Replace (or repair) the

original equipment tire at the first opportunity

and reinstall it on your vehicle. Failure to do

so could result in loss of vehicle control.

CAUTION!

Avoid products or automatic car washes that

use acidic solutions or strong alkaline additives

or harsh brushes. Many aftermarket wheel

cleaners and automatic car washes may

damage the wheel's protective finish. Such

damage is not covered by the New Vehicle

Limited Warranty. Only car wash soap, Mopar

Wheel Cleaner or equivalent is recommended.

8

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SERVICING AND MAINTENANCE

NOTE:

If you intend parking or storing your vehicle for

an extended period after cleaning the wheels

with wheel cleaner, drive your vehicle and apply

the brakes to remove the water droplets from

the brake components. This activity will remove

the red rust on the brake rotors and prevent

vehicle vibration when braking.

Dark Vapor Chrome, Black Satin Chrome, or

Low Gloss Clear Coat Wheels

S

NOW

T

RACTION

D

EVICES

Use of traction devices require sufficient

tire-to-body clearance. Due to limited clearance,

the following snow traction devices are

recommended. Follow these recommendations

to guard against damage:



Snow traction device must be of proper size

for the tire, as recommended by the snow

traction device manufacturer.



No other tire sizes are recommended for use

with the snow traction device.



Please follow the table below for the recom

-

mended tire size, axle and snow traction

device:

CAUTION!

Do not use scouring pads, steel wool, a bristle

brush, metal polishes or oven cleaner. These

products may damage the wheel's protective

finish. Such damage is not covered by the

New Vehicle Limited Warranty. Only car wash

soap, Mopar Wheel Cleaner or equivalent is

recommended.

CAUTION!

If your vehicle is equipped with these

specialty wheels, DO NOT USE wheel

cleaners, abrasives, or polishing compounds.

They will permanently damage this finish and

such damage is not covered by the New

Vehicle Limited Warranty. HAND WASH ONLY

USING MILD SOAP AND WATER WITH A SOFT

CLOTH. Used on a regular basis; this is all that

is required to maintain this finish.

3500 SRW CAB CHASSIS

Trim Level

Axle

Tire/Wheel Size

Snow Traction Device

(maximum projection beyond

tire profile or equivalent)

4x2
4x4

Rear

LT275/70R18E

U Class

SERVICING AND MAINTENANCE

423

3500 DRW CAB CHASSIS

Trim Level

Axle

Tire/Wheel Size

Snow Traction Device

(maximum projection beyond

tire profile or equivalent)

4x2

Rear

LT235/80R17E

U Class

4x4

Front/Rear

4500/5500 DRW CAB CHASSIS

Trim Level

Axle

Tire/Wheel Size

Snow Traction Device

(maximum projection beyond

tire profile or equivalent)

4x2

Rear

225/70R19.5G

U Class

4x4

WARNING!

Using tires of different size and type

(M+S, Snow) between front and rear axles

can cause unpredictable handling. You could

lose control and have a collision.

8

424

SERVICING AND MAINTENANCE

(Continued)

T

IRE

R

OTATION

R

ECOMMENDATIONS

Tires on the front and rear axles of vehicles

operate at different loads and perform different

steering, driving, and braking functions.

For these reasons, they wear at unequal rates.
These effects can be reduced by timely rotation

of tires. The benefits of rotation are especially

worthwhile with aggressive tread designs such

as those on On/Off Road type tires. Rotation will

increase tread life, help to maintain mud, snow,

and wet traction levels, and contribute to a

smooth, quiet ride.

For the proper maintenance intervals

Ú

page 354.

More frequent rotation is permissible if desired.

The reasons for any rapid or unusual wear should be

corrected prior to rotation being performed.

Tire Rotation (Rearward Cross)

NOTE:

On Canadian vehicles only, if your vehicle is

equipped with All-Season type tires on the front

and On/Off Road type tires mounted on the

rear, do not use a front to back rotation pattern.

Instead, rotate your tires side to side at the

recommended intervals.

CAUTION!

To avoid damage to your vehicle or tires,

observe the following precautions:



Because of restricted traction device clear

-

ance between tires and other suspension

components, it is important that only trac

-

tion devices in good condition are used.

Broken devices can cause serious damage.

Stop the vehicle immediately if noise

occurs that could indicate device breakage.

Remove the damaged parts of the device

before further use.



Install device as tightly as possible and

then retighten after driving about 0.5 mile

(0.8 km). Autosock devices do not require

retightening.



Do not exceed 30 mph (48 km/h).



Drive cautiously and avoid severe turns and

large bumps, especially with a loaded

vehicle.



Do not drive for a prolonged period on dry

pavement.



Observe the traction device manufacturer’s

instructions on the method of installation,

operating speed, and conditions for use.

Always use the suggested operating speed

of the device manufacturer’s if it is less

than 30 mph (48 km/h).



Do not use traction devices on a compact

spare tire.

CAUTION!

(Continued)

SERVICING AND MAINTENANCE

425

(Continued)

Dual Rear Wheels

Tire Rotation

The tires used on dual wheel assemblies should

be matched for wear to prevent overloading one

tire in a set. To check if tires are even, lay a

straight edge across all four tires. The straight

edge should touch all the tires.

NOTE:

If your vehicle is equipped with a Tire Pressure

Information System (TPIS):



The Tire Pressure Information System (TPIS)

uses unique sensors in the inner rear wheels

to help identify them from the outer rear

wheels, because of this, the inner and outer

wheel locations can’t be switched.



After a tire rotation is completed, as shown

below, the system can auto learn the locations

of each sensor ID. Auto learning/localization

occurs when the vehicle ignition status is

changed from Off to On and speeds of greater

than 5 mph (8 km/h) are obtained and remain

over 5 mph (8 km/h) for at about a 15 minute

period. You may need to drive for 20 minutes

to account slower speeds and stops.



If the tires are rotated incorrectly, the Auto

localization of the TPIS sensors will fail to

locate correctly resulting in incorrect loca

-

tions for the pressure values displayed in the

Instrument Cluster.

DEPARTMENT OF TRANSPORTATION

UNIFORM TIRE QUALITY GRADES

The following tire grading categories

were established by the National

Highway Traffic Safety Administration.

The specific grade rating assigned by the

tire's manufacturer in each category is

shown on the sidewall of the tires on

your vehicle.

CAUTION!



4500/5500 Dual Rear Tires may only have

one approved direction of rotation. This is

to accommodate the asymmetrical design

(tread pattern) of the On/Off road tire.



When replacing a flat, the spare tire may

have to be remounted on the rim or

installed at a different location to maintain

the correct placement of the tire on the

wheel relative to the tire/wheel position on

the vehicle. For example, if the spare is

used to replace an outer rear tire it will have

to be remounted on the rim so that the

wheel is dished inward. That way the tread

design of asymmetrical tires will maintain

proper position.

CAUTION!

(Continued)

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