2005 MERCEDES-BENZ C CLASS COUPE spare tire

376 Practical hintsWhere will I find ...?Storing the spare wheel
If you wish to store the spare wheel after
use, carry out the following steps. Other-
wise the spare wheel will not fit the wheel
well.
Unscrew the valve cap from the valve
of the spare wheel.

Carefully push the tip of the valve cap
into the spare wheel valve and allow
the air to escape.

Screw the valve cap back on the valve.

Place spare wheel1 in wheel well.

Turn retaining screw 3 clockwise to
its stop to secure the spare wheel.

Install the trunk floor. Spare wheel bolts
1 Wheel bolt for light alloy rims
2 Wheel bolt for light alloy spare wheel
rim size 4
1/2B x15 H2 For more information on model and spare
wheel rim size, see “Technical data”
section (
page 422).
iIt may take a few minutes for the col-
lapsible tire to deflate completely.
!Wheel bolts
2 must be used when
mounting spare wheel rim
size 4
1/2Bx15 H2 (
page 422).
The use of any wheel bolts other than
wheel bolts 2 for spare wheel rim
size 4
1/2B x15 H2 can cause physical
damage to the vehicle.
Warning!
G
Make sure to use the original length wheel
bolts when remounting the original wheel af-
ter it has been repaired.

394 Practical hintsFlat tire
Preparing the vehicle
Park the vehicle as far as possible from
moving traffic on a hard surface.

Turn on the hazard warning flashers.

Turn the steering wheel so that the
front wheels are in a straight ahead
position.

Move the gear selector lever toP
(manual transmission to first or reverse
gear).

Turn off the engine (
page 58).

Remove the SmartKey from the starter
switch.

Have any passenger exit the vehicle at
a safe distance from the roadway.
Mounting the spare wheel
Preparing the vehicle
Prepare the vehicle as described
(page 394).

Take the wheel wrench and the jack
out of wheel well below the trunk floor
(page 373).

Take the spare wheel out of the trunk
(page 375).
Warning!
G
The dimensions of the spare wheel are dif-
ferent from those of the road wheels. As a
result, the vehicle handling characteristics
change when driving with a spare wheel
mounted. Adapt your driving style accord-
ingly.
The spare wheel is for temporary use only.
When driving with spare wheel mounted, en-
sure proper tire pressure and do not exceed
vehicle speed of 50 mph (80 km/h).
Drive to the nearest Mercedes-Benz Center
as soon as possible to have the spare wheel
replaced with a regular road wheel.
Never operate the vehicle with more than
one spare wheel mounted.

397
Practical hints
Flat tire
Mounting the spare wheel
1 Wheel bolt for light alloy rims
2 Wheel bolt for light alloy spare wheel
rim size 4
1/2B x15 H2

Clean contact surfaces of wheel and
wheel hub.

Guide the spare wheel onto the align-
ment bolt and push it on.

Insert wheel bolts and tighten them
slightly.

Inflate the spare tire using the electric
air pump (
page 398).
!Wheel bolts 2 must be used when
mounting spare wheel rim
size 4
1/2Bx15 H2 (
page 422).
The use of any wheel bolts other than
wheel bolts 2 for spare wheel rim
size 4
1/2B x15 H2 can cause physical
damage to the vehicle.
!To avoid paint damage, place wheel flat
against hub and hold it there while
installing first wheel bolt.Warning!
G
Always replace wheel bolts that are dam-
aged or rusted.
Never apply oil or grease to wheel bolts.
Damaged wheel hub threads should be re-
paired immediately. Do not continue to drive
under these circumstances! Contact an
authorized Mercedes-Benz 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.
Make sure to use the correct mounting
bolts.
Warning!
G
Inflate spare wheel with collapsible tire only
after the wheel is properly mounted.
Inflate the spare wheel tire using the electric
air pump before lowering the vehicle.


398 Practical hintsFlat tire
Unscrew the alignment bolt, install last
wheel bolt and tighten slightly.Inflating the spare tire

Take the electric air pump out of the
trunk.
1 Flap
2 On/off switch
3 Electrical plug
4 Air hose with pressure gauge and vent
screw
5 Union nut
Warning!
G
Use only genuine equipment
Mercedes-Benz wheel bolts. Other wheel
bolts may come loose.
Do not tighten the wheel bolts when the ve-
hicle is raised. Otherwise the vehicle could
fall off the jack.
Warning!
G
Inflate spare wheel with collapsible tire only
after the wheel is properly mounted.
Inflate the spare wheel tire using the electric
air pump before lowering the vehicle.Warning!
G
Observe instructions on air pump label.!Do not lower the vehicle before inflat-
ing the collapsible tire. Otherwise the
rim may be damaged.


399
Practical hints
Flat tire

Open flap
1 on electric air pump.

Pull out electrical plug 3 and air hose
with pressure gauge 4.

Remove the valve cap from valve.

Screw air hose 4 onto the tire valve.

Insert electrical plug 3 into vehicle
cigarette lighter socket.

Turn the SmartKey in the starter switch
to position 1.

Press I on electric air pump switch 2.
The electric air pump should now
switch on and inflate the spare tire.

Inflate the spare tire to approximately
36 psi (2.5 bar).
This takes about five minutes for the
spare tire. Air hose 4 and union
nut 5 can become hot during infla-
tion. Exercise proper caution to avoid
burning yourself when using the equip-
ment.

Press 0on electric air pump switch 2.

Turn the SmartKey in the starter switch
to position 0.

If the tire pressure is above 36 psi
(2.5 bar), release excess tire pressure
using the vent screw.

Detach the electric air pump.

Store the electrical plug and the air
hose behind the flap and place the air
pump back in the trunk.
!Do not operate the electric air pump
longer than six minutes without
interruption. Otherwise it may over-
heat.
You may operate the electric air pump
again after it has cooled off.
Warning!
G
Follow recommended inflation pressures.
Do not overinflate tires. Overinflated tires
can result in sudden deflation (blowout) be-
cause they are more likely to become punc-
tured or damaged by road debris, potholes,
etc.
Do not underinflate tires. Underinflated tires
wear unevenly, adversely affect handling
and fuel economy, and are more likely to fail
from being overheated.

400 Practical hintsFlat tireLowering the vehicle
Lower vehicle by turning crank coun-
terclockwise until vehicle is resting ful-
ly on its own weight.

Remove the jack.1
-5 Wheel bolts

Tighten the five wheel bolts evenly, fol-
lowing the diagonal sequence
illustrated ( 1 to 5 ), until all bolts are
tight. Observe a tightening torque of
80 lb-ft (110 Nm). Before storing the jack, it should be fully
collapsed, with handle folded in (storage
position) (
page 374).

Store the jack, the damaged wheel and
the other vehicle tools in the wheel well
below the trunk floor (
page 375).
Warning!
G
Inflate spare wheel with collapsible tire only
after the wheel is properly mounted.
Inflate the spare wheel tire using the electric
air pump before lowering the vehicle.
Warning!
G
Have the tightening torque checked after
changing a wheel. The wheels could come
loose if they are not tightened to a torque of
80 lb-ft (110 Nm).

422 Technical dataRims and TiresSpare wheel
C 230 Kompressor
C320
Rim (light alloy)
4.5Bx15H2
4.5Bx16H2
Wheel offset
0.47 in (12 mm)
0.47 in (12 mm)
Collapsible Tire
165 - 15 89P
1
165/70 - 16 92P
1
1Must not be used with snow chains.

437
Technical terms
ABS
(A
ntilock B
rake S
ystem)
Prevents the wheels from locking up
during braking so that the vehicle can
continue to be steered.
Accessory weight (
page 323)
Air pressure (page 323)
Alignment bolt Metal pin with thread. The centering
pin is an aid used when changing a tire
to align the wheel with the wheel hub.
Aspect ratio (page 323)
Bar (page 323)
BAS (Brake A
ssist S
ystem)
System for potentially reducing braking
distances in emergency braking situa-
tions. The system is activated when it
senses an emergency based on how
fast the brake is applied. Bead
(
page 323)
Bi-Xenon headlamps* Headlamps which use an electric arc as
the light source and produce a more in-
tense light than filament headlamps.
Bi-Xenon headlamps produce low
beam and high beam.
CAC (Customer A
ssistance C
enter)
Mercedes-Benz customer service cen-
ter, which can help you with any ques-
tions about your vehicle and provide
assistance in the event of a break-
down.
CAN system (C
ontroller A
rea N
etwork)
Data bus network serving to control ve-
hicle functions such as door locking or
windshield wiping. Cockpit
All instruments, switches, buttons and
indicator/warning lamps in the passen-
ger compartment needed for vehicle
operation and monitoring.
Cold tire inflation pressure (
page 323)
Collapsible tire An especially compact spare tire that
must be inflated with a provided air
pump before using. It should only be
used to bring the vehicle to the nearest
service station.
COMAND* (Cockpit M
anagement and D
ata Sys-
tem)
Information and operating center for
vehicle sound and communications
systems, including the radio and navi-
gation system, as well as other optional
equipment (CD changer, telephone,
etc.).