wheel bolt torque SMART FORTWO COUPE ELECTRIC DRIVE 2015 Owners Manual

The traction grades, from highest to low-
est, are AA, A, B, and C. Those grades rep-
resent the tire’s ability to stop on wet
pavement as measured under controlled
conditions on specified government test
surfaces of asphalt and concrete. A tire
marked C may have poor traction perform-
ance.
Temperature G
WARNING
The temperature grade for this tire is
established for a tire that is properly
inflated and not overloaded. Excessive
speed, underinflation, or excessive load-
ing, either separately or in combination,
can cause excessive heat build-up and pos- sible tire failure.
The temperature grades are A (the highest),
B, and C, representing the tire’s resistance to the generation of heat and its ability todissipate heat when tested under control-
led conditions on a specified indoor lab-
oratory test wheel. Sustained high temper- ature can cause the material of the tire to
degenerate and reduce tire life, and
excessive temperature can lead to sudden
tire failure. The grade C corresponds to a
level of performance which all passenger
car tires must meet under the Federal Motor
Vehicle Safety Standard No. 109. Grades B
and A represent higher levels of perform-
ance on the laboratory test wheel than the
minimum required by law. Rotating tires
G
WARNING
Do not rotate front and rear wheels as they
have different dimensions, e.g. rim size,
wheel offset etc. Otherwise, the handling
can be affected and you could endanger
yourself and others. Thoroughly clean the mounting face of the
wheels and brake discs, i.e. the inner side of the wheels/tires each time the wheels/
tires are changed. Check for and ensure
proper tire inflation pressure. G
WARNING
Have the tightening torque checked after
changing a wheel. Wheels could become
loose if not tightened with a torque of
81 lb‑ft (110 Nm).
Only use genuine smart wheel bolts speci-
fied for your vehicle’s rims.
For information on wheel change, see “Flat
tire” (Y page 187). Tire labeling
Besides tire name (sales designation) and
manufacturer name, a number of markings
can be found on a tire.
Following are some explanations for the
markings on your vehicle’s tires: :
Uniform Quality Grading Standards
(Ypage 138)
; DOT, Tire Identification Number (TIN)
(Ypage 142)
= Maximum tire load (Y page 136)
? Maximum tire inflation pressure
(Ypage 133) Tires and wheels
139>> Operation. Z

X
Drive to the nearest authorized electric
drive smart center, to have the damaged
tire replaced.
X Contact an authorized electric drive
smart center as soon as possible to
obtain a new filler hose and a new tire
sealant container.
X Bring used tire sealant materials to an
authorized electric drive smart center
for proper disposal.
X Replace your tire sealant container
every 4 years. Replacement containers
are available at any authorized electric
drive smart center. G
WARNING
After changing a tire, contact an author-
ized electric drive smart center to make
sure the bolts holding the wheel to the car
are tight enough. Otherwise, the wheels
could come off. Each bolt should be tight-
ened to a torque of 81 lb‑ft (110 Nm). Sealing a tire (Version 2)
X Take the tire repair kit from the
passenger footwell (Y page 160).X
Take electrical plug =and filler hose
B from the bottom of the electric air
pump housing.
X Engage the yellow plug of filler hose B
in the opening in yellow closure cap A.X
With the O-ring seals towards the elec-
tric air pump housing, insert yellow clo-
sure cap Ainto fixture ;.
X Push tire sealant container :into fix-
ture ;until both hooks of yellow closure
cap Aengage. X
Unscrew the valve cap from tire valve C
of the damaged tire.
X Screw the end of filler hose Bonto tire
valve C.
X Insert electrical plug =into the aux-
iliary power outlet (Y page 110).
X Insert the key in the starter switch and
turn it to position 1.
i The vehicle’s 12‑volt battery is drained
by use of the electric air pump. You
should therefore keep the drive system
running while inflating the tire.
X Press ONon electric air pump switch ?.
The electric air pump is switched on and
inflates the tire.
i First, the sealant is pumped into the
tire. The pressure may briefly increase
to a high value. This is normal and not an
indication of a malfunction. Do not
switch off the electric air pump.
X Let the electric air pump inflate the tire
for a maximum of ten minutes.
The pressure gauge must display at least200 kpa (2.0 bar, 29 psi).
! Do not operate the electric air pump
longer than ten minutes without inter-
ruption. Otherwise it may overheat. 192
Flat tire>> Practical hints.

placard located on the driver’s door
B‑pillar).
R To increase the tire inflation pres-
sure: Switch on the electric air pump.
R To decrease the tire inflation pres-
sure: Press deflate button D. Recheck
the tire inflation pressure with the
electric air pump’s pressure gauge E.
X When the tire inflation pressure is cor-
rect, unscrew the end of filler hose ?
from tire valve C.
X Screw the valve cap onto the tire valve. X
To detach tire sealant container :from
the electric air pump, press both
latches.
X Pull tire sealant container :out of fix-
ture ;.
Filler hose ?remains on tire sealant
container :.
X Place the tire repair kit securely in the
vehicle.
! The manufacturer is unable to guaran-
tee that all tire punctures can be
repaired with the tire repair kit, in par-
ticular cuts or perforations larger than
approximately 0.16 in (4 mm) or away from
the tire’s tread. The manufacturer is not liable for damage sustained through
improper use of the tire repair kit. G
WARNING
Follow recommended tire inflation pres-
sures. Do not underinflate tires. Underinflated
tires wear excessively and/or unevenly,
adversely affect handling and energy con-
sumption of the vehicle, and are more
likely to fail from being overheated.
Do not overinflate tires. Overinflated
tires can adversely affect handling and
ride comfort, wear unevenly, increase
stopping distance, and result in sudden
deflation (blowout) because they are more
likely to become punctured or damaged by
road debris, potholes etc.
Do not overload the tires by exceeding the
specified load limit as indicated on the
Tire and Loading Information placard on
the driver’s door B‑pillar. Overloading the tires can overheat them, possibly causing a
blowout. Overloading the tires can also
result in handling or steering problems, or brake failure.
X Drive to the nearest authorized electric
drive smart center, to have the damaged
tire replaced.
X Contact an authorized electric drive
smart center as soon as possible to
obtain a new filler hose and a new tire
sealant container.
X Bring used tire sealant materials to an
authorized electric drive smart center
for proper disposal.
X Replace your tire sealant container
every 4 years. Replacement containers
are available at any authorized electric
drive smart center. G
WARNING
After changing a tire, contact an author-
ized electric drive smart center to make
sure the bolts holding the wheel to the car
are tight enough. Otherwise, the wheels
could come off. Each bolt should be tight-
ened to a torque of 81 lb‑ft (110 Nm). 194
Flat tire>> Practical hints.

Warning label
The take-up brackets are identified by the
embossed recesses in the area of the door
sills. X
Position jack ;under take-up
bracket :so that it is always vertical as
seen from the side, even if the vehicle is
parked on an incline.
X Jack up the vehicle until the wheel is a
maximum of 1.2 in (3 cm) from the ground.
X Unscrew and remove the wheel bolts.
! Do not place wheel bolts in sand or dirt.
This could result in damage to the wheel
bolts and wheel hub threads.
X Remove the wheel. Mounting the wheel
G
WARNING
Always replace wheel bolts that are dam-
aged or rusted.
Never apply oil or grease to wheel bolts. Damaged wheel hub threads should be
repaired immediately. Do not continue to
drive under these circumstances! Contact
an authorized electric drive smart center
or call Roadside Assistance.
Incorrect wheel bolts or improperly tight-
ened wheel bolts can cause the wheel to
come off. This could cause an accident. Be
sure to use the correct wheel bolts. G
WARNING
Only use genuine smart wheel bolts. Other
wheel bolts may come loose.
Do not tighten the wheel bolts when the
vehicle is raised. Otherwise the vehicle
could fall off the jack.
X Clean contact surfaces of wheel and wheel
hub.
! To avoid paint damage, place wheel flat
against hub and hold it there while
installing first wheel bolt. X
Guide the wheel onto the wheel hub and
push it on.
X Insert two wheel bolts and tighten them
slightly.
X Install last wheel bolt and tighten it
slightly.
X Lower the vehicle until the vehicle is
resting fully on its own weight.
X Remove the jack.
X Tighten the wheel bolts. Observe a tight-
ening torque of 80 lb-ft (110 Nm). 196
Wheel change>> Practical hints.