tire size RAM CHASSIS CAB 2019 Owner's Manual

462 SERVICING AND MAINTENANCE
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.
Do not install a wheel cover or attempt to mount a conven -
tional 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 collaps -
ible 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. 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 463
Do not install a wheel cover or attempt to mount a conven -
tional 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 equip -
ment tire, replace (or repair) the original equipment tire and
reinstall on the vehicle at the first opportunity. 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 rein -
stall 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!
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. 7

SERVICING AND MAINTENANCE 465
Dark Vapor Chrome, Black Satin Chrome, or Low Gloss
Clear Coat Wheels
Tire Chains (Traction Devices)
Use of traction devices require sufficient tire-to-body clear -
ance. Follow these recommendations to guard against
damage.
• Traction device must be of proper size for the tire, as
recommended by the traction device manufacturer.
Please follow the table below for proper tire size, chain type,
and axle recommendations: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.
Vehicle Axle Recommendations Tire Sizes Chain Class
Chassis Cab 3500 (Single Rear
Wheel) Models Rear Only LT275/70R18E U Class
Chassis Cab 3500 (Dual Rear
Wheel) 4X2 Models Rear Only LT235/80R17E U Class
Chassis Cab 3500 (Dual Rear
Wheel) 4X4 Models Front/Rear LT235/80R17E U Class
Chassis Cab 4500/5500 Models Rear Only 225/70R19.5G U Class 7

466 SERVICING AND MAINTENANCE
(Continued)Tire Rotation Recommendations
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 aggres -
sive 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.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.
CAUTION!
To avoid damage to your vehicle or tires, observe the
following precautions:
• Because of restricted traction device clearance between
tires and other suspension components, it is important
that only traction 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 ½ mile (0.8 km).
• 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 instruc -
tions on the method of installation, operating speed,
and conditions for use. Always use the suggested oper -
ating 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)

TECHNICAL SPECIFICATIONS 477
Torque Specifications
**Use only your authorized dealer recommended lug nuts/
bolts and clean or remove any dirt or oil before tightening.
Inspect the wheel mounting surface prior to mounting the
tire and remove any corrosion or loose particles.
NOTE:
Dual wheels are flat mounted, center piloted. The lug nuts
are a two-piece assembly. When the tires are being rotated or
replaced, clean these lug nuts and add two drops of oil at the
interface between the hex and the washer. Ensure that the
socket is fully engaged on the lug nut/bolt (do not insert it
half way). Oil Interface Location
Do not oil wheel studs. For chrome wheels, do not substitute
with chrome plated wheel nuts.Lug Nut/Bolt
Torque Lug Nut/Bolt
Type **Lug Nut/
Bolt Size Lug Nut/Bolt
Socket Size
120-150 Ft-Lbs
(160-200 N·m) Cone
M14 x 1.50 22 mm
130-160 Ft-Lbs
(190-220 N·m) Flanged
8

602
Load Capacity .............................................................. 450, 451
Pressure Monitoring System (TPMS) ....................... 152, 177
Quality Grading .................................................................. 468
Radial .................................................................................... 456
Replacement......................................................................... 459
Rotation ................................................................................ 466
Safety............................................................................. 444, 454
Sizes....................................................................................... 446
Snow Tires ............................................................................ 461
Spare Tires .................................................................... 461, 463
Spinning................................................................................ 457
Trailer Towing ..................................................................... 347
Tread Wear Indicators ........................................................ 458
Wheel Nut Torque .............................................................. 476
To Open Hood ........................................................................... 95
Tongue Weight/Trailer Weight ............................................ 345
Torque Converter Clutch ....................................................... 263
Towing.............................................................................. 339, 406
Disabled Vehicle.................................................................. 406
Guide..................................................................................... 345
Recreational.......................................................................... 358
Weight................................................................................... 345
Towing Behind A Motorhome .............................................. 358
Traction..................................................................................... 363
Traction Control ...................................................................... 166
Traction Control Switch ......................................................... 166 Trailer Sway Control (TSC) ................................................... 170
Trailer Towing .........................................................................339
Cooling System Tips ........................................................... 354
Hitches ..................................................................................344
Minimum Requirements ....................................................346
Mirrors ....................................................................................61
Tips ........................................................................................353
Trailer And Tongue Weight...............................................345
Wiring ...................................................................................352
Trailer Towing Guide .............................................................345
Trailer Weight ..........................................................................345
Transfer Case ...........................................................................444
Electronically Shifted ..........................................................272
Fluid ...................................................................................... 486
Transmission ............................................................................265
Automatic .............................................................256, 265, 439
Fluid ...................................................................................... 486
Maintenance .........................................................................439
Shifting ..................................................................................254
Transporting Pets .................................................................... 240
Tread Wear Indicators ............................................................ 458
Turn Signals ...............................................................70, 157, 373
U
Uconnect
Uconnect Settings ................490, 497, 500, 519, 522, 539, 541