tire size JEEP WRANGLER 2012 JK / 3.G Owners Manual

SOFT TOP — TWO-DOOR MODELS
Please visit the owners section of Jeep.com for instruc-
tional videos.
CAUTION!
The soft top is not designed to carry any additional
loads such as roof racks, spare tires, building, hunt-
ing, or camping supplies, and/or luggage, etc. Also, it
was not designed as a structural member of the
vehicle and, thus, cannot properly carry any addi-
tional loads other than environmental (rain, snow,
etc.).
If the temperature is below 72°F (24°C) and/or the top
has been folded down for a period of time, the top will
appear to have shrunk when you raise it, making it
difficult to put up. This is caused by a natural contraction
of the vinyl coating on the fabric top. Place the vehicle in a warm area. Pull steadily on the top
fabric. The vinyl will stretch back to its original size and
the top can then be installed.
If the temperature is 41°F
(5°C) or below, do not attempt to put the top down or
roll the rear or side curtains.CAUTION!
•Do not run a fabric top through an automatic car
wash. Window scratches and wax build up may
result.
•Do not lower the top when the temperature is
below 41°F (5°C). Damage to the top may result.
•Do not move your vehicle until the top has been
either fully attached to the windshield frame, or
fully lowered.
•Do not lower the top with the windows installed.
Window and top damage may occur.
(Continued)
194 UNDERSTANDING THE FEATURES OF YOUR VEHICLE

SOFT TOP — FOUR-DOOR MODELS
Please visit the owner’s section of Jeep.com for instruc-
tional videos.
CAUTION!
The soft top is not designed to carry any additional
loads such as roof racks, spare tires, building, hunt-
ing, or camping supplies, and/or luggage, etc. Also, it
was not designed as a structural member of the
vehicle, and thus cannot properly carry any addi-
tional loads other than environmental (rain, snow,
etc.).
If the temperature is below 72°F (24°C) and/or the top
has been folded down for a period of time, the top will
appear to have shrunk when you raise it, making it
difficult to put up. This is caused by a natural contraction
of the vinyl coating on the fabric top. Place the vehicle in a warm area. Pull steadily on the top
fabric. The vinyl will stretch back to its original size and
the top can then be snapped into place.
If the tempera-
ture is 41°F (5°C) or below, do not attempt to put the top
down or roll the rear or side curtains.CAUTION!
•Do not run a fabric top through an automatic car
wash. Window scratches and wax buildup may
result.
•Do not lower the top when the temperature is
below 41°F (5°C). Damage to the top may result.
•Do not lower the top when the windows are dirty.
Grit may scratch the window.
•Do not move your vehicle until the top has been
either fully attached to the windshield frame, or
fully lowered.
(Continued)
3
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 219

tires of a different size than the size indicated on the
vehicle placard or tire inflation pressure label, you should
determine the proper tire inflation pressure for those tires.)
As an added safety feature, your vehicle has been
equipped with a Tire Pressure Monitoring System
(TPMS) that illuminates a low tire pressure telltale when
one or more of your tires is significantly under-inflated.
Accordingly, when the low tire pressure telltale illumi-
nates, you should stop and check your tires as soon as
possible, and inflate them to the proper pressure. Driving
on a significantly under-inflated tire causes the tire to
overheat and can lead to tire failure. Under-inflation also
reduces fuel efficiency and tire tread life, and may affect
the vehicle’s handling and stopping ability.
Please note that the TPMS is not a substitute for proper
tire maintenance, and it is the driver ’s responsibility to
maintain correct tire pressure, even if under-inflation has
not reached the level to trigger illumination of the TPMS
low tire pressure telltale.Your vehicle has also been equipped with a TPMS
malfunction indicator to indicate when the system is not
operating properly. The TPMS malfunction indicator is
combined with the low tire pressure telltale. When the
system detects a malfunction, the telltale will flash for
approximately one minute and then remain continuously
illuminated. This sequence will continue upon subse-
quent vehicle start-ups as long as the malfunction exists.
When the malfunction indicator is illuminated, the sys-
tem may not be able to detect or signal low tire pressure
as intended. TPMS malfunctions may occur for a variety
of reasons, including the installation of replacement or
alternate tires or wheels on the vehicle that prevent the
TPMS from functioning properly. Always check the
TPMS malfunction telltale after replacing one or more
tires or wheels on your vehicle, to ensure that the
replacement or alternate tires and wheels allow the TPMS
to continue to function properly.
276 UNDERSTANDING YOUR INSTRUMENT PANEL

CAUTION!
The TPMS has been optimized for the original
equipment tires and wheels. TPMS pressures and
warning have been established for the tire size
equipped on your vehicle. Undesirable system opera-
tion or sensor damage may result when using re-
placement equipment that is not of the same size,
type, and/or style. Aftermarket wheels can cause
sensor damage. Do not use tire sealant from a can or
balance beads if your vehicle is equipped with a
TPMS, as damage to the sensors may result.
24. Odometer / Trip Odometer Display Area
The odometer display shows the total distance the vehicle
has been driven. The trip odometer shows individual trip
mileage. Refer to “Odometer / Trip Odometer / ECO
(Fuel Saver Indicator) Button” for additional information.
U.S. Federal regulations require that upon transfer of
vehicle ownership, the seller certify to the purchaser the
correct mileage that the vehicle has been driven. If your
odometer needs to be repaired or serviced, the repair
technician should leave the odometer reading the same
as it was before the repair or service. If s/he cannot do so,
then the odometer must be set at zero, and a sticker must
be placed in the door jamb stating what the mileage was
before the repair or service. It is a good idea for you to
make a record of the odometer reading before the repair/
service, so that you can be sure that it is properly reset, or
that the door jamb sticker is accurate if the odometer
must be reset at zero.
4
UNDERSTANDING YOUR INSTRUMENT PANEL 277

▫Brake Assist System (BAS) .............. 420
▫ Hill Start Assist (HSA) ................ 420
▫ Electronic Roll Mitigation (ERM) ......... 424
▫ Electronic Stability Control (ESC) ......... 425
▫ ESC Activation/Malfunction Indicator Light
And ESC Off Indicator Light ............ 429
▫ Trailer Sway Control (TSC) ............. 430
▫ Hill Descent Control (HDC) – If Equipped . . 431
 Tire Safety Information ................. 432
▫ Tire Markings ....................... 432
▫ Tire Identification Number (TIN) ......... 436
▫ Tire Terminology And Definitions ......... 437
▫ Tire Loading And Tire Pressure .......... 438
Tires — General Information ............. 443
▫ Tire Pressure ....................... 443
▫ Tire Inflation Pressures ................ 444
▫ Tire Pressures For High-Speed Operation . . . 445
▫ Radial-Ply Tires ..................... 446
▫ Spare Tire Matching Original Equipped Tire
And Wheel – If Equipped .............. 446
▫ Compact Spare Tire – If Equipped ........ 447
▫ Full Size Spare – If Equipped ............ 447
▫ Limited-Use Spare – If Equipped ......... 448
▫ Tire Spinning ....................... 448
▫ Tread Wear Indicators ................. 449
▫ Life Of Tire ........................ 450
5
STARTING AND OPERATING 369

When operating your vehicle in 4L, the engine speed will
be approximately three times (four times for Rubicon
models) that of the 2H or 4H positions at a given road
speed. Take care not to overspeed the engine.
Proper operation of four-wheel drive vehicles depends
on tires of equal size, type, and circumference on each
wheel. Any difference will adversely affect shifting and
cause damage to the transfer case.
Because four-wheel drive provides improved traction,
there is a tendency to exceed safe turning and stopping
speeds. Do not go faster than road conditions permit.WARNING!
You or others could be injured if you leave the
vehicle unattended with the transfer case in the N
(Neutral) position without first fully engaging the
parking brake. The transfer case N (Neutral) position
disengages both the front and rear driveshaft from
the powertrain, and will allow the vehicle to move
regardless of the transmission position. The parking
brake should always be applied when the driver is
not in the vehicle.
Shift Positions
For additional information on the appropriate use of each
transfer case mode position, see the information below:
2H Position
This range is used for normal street and highway driving
on hard-surfaced roads.
392 STARTING AND OPERATING

CAUTION!
If the “Brake Warning Light” remains on with the
parking brake released, a brake system malfunction
is indicated. Have the brake system serviced by an
authorized dealer immediately.
ANTI-LOCK BRAKE SYSTEM
The Anti-Lock Brake System (ABS) is designed to aid the
driver in maintaining vehicle control under adverse
braking conditions. The system operates with a separate
computer to modulate hydraulic pressure to prevent
wheel lock-up and help avoid skidding on slippery
surfaces.
All vehicle wheels and tires must be the same size and
type, and tires must be properly inflated to produce
accurate signals for the computer.
WARNING!
Significant over or under-inflation of tires, or mixing
sizes of tires or wheels on the vehicle can lead to loss
of braking effectiveness.
The Anti-Lock Brake System conducts a low speed self-
test at about 12 mph (20 km/h). If for any reason your
foot is on the brake when the vehicle reaches 12 mph
(20 km/h), this check will be delayed until 25 mph
(40 km/h).
The Anti-Lock Brake System pump motor runs during
the self-test, and during an ABS stop, to provide the
regulated hydraulic pressure. The motor pump makes a
low humming noise during operation; this is normal.
5
STARTING AND OPERATING 417

Enabling HDC
1. Shift the transfer case into 4WD LOW range. Refer to
“Four-Wheel Drive Operation” in “Starting and Operat-
ing” for further information.
2. Press the “Hill Descent” button. The “Hill Descent
Control Indicator Light” in the instrument cluster will
turn on solid.
NOTE:If the transfer case is not in 4WD LOW range,
the “Hill Descent Control Indicator Light” will flash for
five seconds and HDC will not be enabled.
Disabling HDC
1. Press the “Hill Descent” button or shift the transfer
case out of 4WD LOW range. The “Hill Descent Control
Indicator” light in the instrument cluster will turn off.TIRE SAFETY INFORMATION
Tire Markings
1 — U.S. DOT Safety
Standards Code (TIN) 4 — Maximum Load
2 — Size Designation 5 — Maximum Pressure
3 — Service Description 6 — Treadwear, Traction and Temperature Grades
432 STARTING AND OPERATING

NOTE:
•P (Passenger) - Metric tire sizing is based on U.S.
design standards. P-Metric tires have the letter “P”
molded into the sidewall preceding the size designa-
tion. Example: P215/65R15 95H.
•European-Metric tire sizing is based on European
design standards. Tires designed to this standard have
the tire size molded into the sidewall beginning with
the section width. The letterPis absent from this tire
size designation. Example: 215/65R15 96H.
•LT (Light Truck) - Metric tire sizing is based on U.S.
design standards. The size designation for LT-Metric tires is the same as for P-Metric tires except for the
letters “LT” that are molded into the sidewall preced-
ing the size designation. Example: LT235/85R16.
•Temporary spare tires are spares designed for tempo-
rary emergency use only. Temporary high pressure
compact spare tires have the letter “T” or “S” molded
into the sidewall preceding the size designation. Ex-
ample: T145/80D18 103M.
•High flotation tire sizing is based on U.S. design
standards, and it begins with the tire diameter molded
into the sidewall. Example: 31x10.5 R15 LT.5
STARTING AND OPERATING 433

Tire Sizing Chart
EXAMPLE:
Size Designation:
P= 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
TorS= Temporary compact spare tire
31 = Overall diameter in inches (in)
215 = Section width in millimeters (mm)
65 = Aspect ratio in percent (%)
— Ratio of section height to section width of tire
10.5 = Section width in inches (in)
R = Construction code
—R means radial construction
— D means diagonal or bias construction
15 = Rim diameter in inches (in)
434 STARTING AND OPERATING