Page 279 of 388
WHEEL AND TIRE TORQUE
SPECIFICATIONS
Proper lug nut/bolt torque is very important to ensure
that the wheel is properly mounted to the vehicle. Any
time a wheel has been removed and reinstalled on the
vehicle the lug nuts/bolts should be torqued using a
properly calibrated torque wrench.
Torque Specifications
Lug Nut/BoltTorque **Lug Nut/
Bolt Size Lug Nut/
Bolt
Socket Size
135N·m M12x1.25 19mm
**Use only FIAT 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.
(fig. 164)
Tighten the lug nuts/bolts in a star pattern until each
nut/bolt has been tightened twice.
(fig. 165)
(fig. 164) Wheel Mounting Surface
(fig. 165) Torque Patterns
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Page 287 of 388

WARNING!
To avoid possible personal injury, handle
the w
heel covers with care to avoid con-
tact with any sharp edges.
6. Install the spare tire.
Be sure to mount the spare tire with the
valve stem facing outward. The vehicle
could be damaged if the spare tire is
mounted incorrectly.
(fig. 175) NOTE:
• For vehicles so equipped, do not attempt to install a
center cap or wheel cover on the compact spare.
• Refer to “Compact Spare Tire” and to “Limited-Use Spare” under “Tires — General Information” in
“Technical Specifications” for additional warnings,
cautions, and information about the spare tire, its
use, and operation.
7.
Install the wheel nuts with the cone-shaped end of the
nut toward the wheel. Lightly tighten the wheel nuts.
WARNING!
To avoid the risk of forcing the vehicle off
the jack, do not tighten the wheel nuts
fully until the vehicle has been lowered. Failure to
follow this warning may result in personal injury.
8. Lower the vehicle by turning the jack screw coun- terclockwise with the jack handle.
9. Finish tightening the lug nuts. Push down on the wrench while at the end of the handle for increased
leverage. Tighten the lug nuts in a star pattern until
each nut has been tightened twice. Refer to “Torque
Specifications” in this section for proper lug nut
torque. If in doubt about the correct tightness, have
them checked with a torque wrench by your autho-
rized dealer or service station.
(fig. 175)
Mounting Spare Tire
281
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Page 289 of 388

4. Install the remaining lug nuts with the cone shapedend of the nut toward the wheel. Lightly tighten the
lug nuts.
WARNING!
To avoid the risk of forcing the vehicle
off t h
e jack, do not tighten the lug nuts
fully until the vehicle has been lowered. Failure to
follow this warning may result in personal injury.
5. Lower the vehicle to the ground by turning the jack handle counterclockwise.
6. Finish tightening the lug nuts. Push down on the wrench while at the end of the handle for increased
leverage. Tighten the lug nuts in a star pattern until
each nut has been tightened twice. For the correct
lug nut torque refer to Torque Specifications in this
section. If in doubt about the correct tightness, have
them checked with a torque wrench by your autho-
rized dealer or service station.
7. After 40 km check the lug nut torque with a torque wrench to ensure that all lug nuts are properly
seated against the wheel. Vehicles Without Wheel Covers
1. Mount the road tire on the axle.
2. Install the remaining lug nuts with the cone shaped
end of the nut toward the wheel. Lightly tighten the
lug nuts.
WARNING!
To avoid the risk of forcing the vehicle
off t h
e jack, do not tighten the lug nuts
fully until the vehicle has been lowered. Failure to
follow this warning may result in personal injury.
3. Lower the vehicle to the ground by turning the jack handle counterclockwise.
4. Finish tightening the lug nuts. Push down on the wrench while at the end of the handle for increased
leverage. Tighten the lug nuts in a star pattern until
each nut has been tightened twice. For proper lug
nut torque refer to Torque Specifications in this
secton. If in doubt about the correct tightness, have
them checked with a torque wrench by your autho-
rized dealer or service station.
5. After 40 km check the lug nut torque with a torque wrench to ensure that all lug nuts are properly
seated against the wheel.
283
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Page 355 of 388

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:
Safety
WARNING!
• Improperly inflated tires are danger-
ous an d
can cause collisions.
• Under-inflation increases tire flexing and can
result in over-heating and tire failure.
• Over-inflation reduces a tire's ability to cush-
ion shock. Objects on the road and chuckholes
can cause damage that result in tire failure.
• Over-inflated or under-inflated 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
totherightorleft.
• Always drive with each tire inflated to the
recommended cold tire inflation pressure. Economy
Improper inflation pressures can cause uneven wear
patterns to develop across the tire tread. These abnor-
mal wear patterns will reduce tread life resulting in a
need for earlier tire replacement. Under-inflation also
increases tire rolling resistance resulting in higher fuel
consumption.
Ride Comfort And Vehicle Stability
Proper tire inflation contributes to a comfortable ride.
Over-inflation produces a jarring and uncomfortable
ride. Both under-inflation and over-inflation affect the
stability of the vehicle and can produce a feeling of
sluggish response or over responsiveness in the steer-
ing.
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.
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.
349
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