MERCEDES-BENZ CLA 2023 Owners Manual

brake system and in the wheel suspension
may be damaged.Always replace wheels and tires with
ones that fulNll the speciNcations of the
original part.
For wheels, pay attention to the following:
= Designation
= Type
For tires, pay attention to the following: = Designation
= Manufacturer
= Type
&WARNING Risk of injury through exceed-
ing the speciNed tire load-bearing capa-
city or the permissible speed rating
Exceeding the speciNed tire load rating or the
permissible speed rating may lead to tire dam-
age and to the tires bursting.
Therefore, only use tire types and sizes
approved for your vehicle model.Observe the tire load rating and speed
rating required for your vehicle.*NOTE Vehicle and tire damage caused by
non-approved tire types and sizes
For safety reasons, only use tires, wheels and
accessories which have been specially
approved by Mercedes-Benz for your vehicle.
These tires are specially adapted to the active safety systems, such as ABS, ESP n
and
4MATIC, and marked as follows:
= MO = Mercedes-Benz Original
= MOE = Mercedes-Benz Original Extended
(run-Oat tires only for certain wheels)
= MO1 = Mercedes-Benz Original (only cer-
tain AMG tires)
Otherwise, certain properties, such as han-
dling characteristics, vehicle noise emissions,
consumption, etc. could be adversely aMec-
ted. Furthermore, other tire sizes could result
in the tires rubbing against the body and axle
components when loaded. This could result in
damage to the tire or the vehicle.
Only use tires, wheels and accessories that have been checked and recommended by
Mercedes-Benz.*NOTE Risk to driving safety from retrea-
ded tires
Retreaded tires are neither tested nor recom- mended by Mercedes-Benz, since previous
damage cannot always be detected on retrea-
ded tires.
For this reason driving safety cannot be guar-
anteed.
Do not use used tires if you have no information about their previous usage.*NOTE Possible wheel and tire damage
when driving over obstacles
Large wheels have a smaller section width. As
the section width decreases, the risk of
Wheels and tires319

wheels and tires being damaged when driving
over obstacles increases.Avoid obstacles or drive especially care-
fully.Reduce your speed when driving over
curbs, speed bumps, manhole covers and potholes.Avoid particularly high curbs.*NOTE Possible wheel and tire damage
when parking on curbs or in potholes
Parking on curbs or in potholes can damage
the wheels and tires.
Only park on as level a surface as possi-
ble.Avoid curbs and potholes when parking.*NOTE Damage to electronic component
parts due to the use of tire-installing tools
Vehicles with tire pressure monitoring sys-
tem: There are electronic component parts in
the wheel.
If tire-installing tools are positioned in the area
of the valve, the electronic components could be damaged.Tire-installing tools should not be applied
in the area of the valve.Always have tires change at a qualiNed
specialist workshop.*NOTE Damage to summer tires at low
ambient temperatures
At low ambient temperatures, tears could form
when driving with summer tires, causing per-
manent damage to the tires.
At temperatures below 45 °F (7 °C) use M M\fS tires.
Accessory parts which are not approved for your
vehicle by Mercedes-Benz, or which are not used
correctly, can impair the operating safety.
Before purchasing and using non-approved acces-
sories, visit a qualiNed specialist workshop and
inquire about:
= Suitability
=Legal stipulations
= Factory recommendations&WARNING Risk of accident with high per-
formance tires
The special tire tread in combination with the
optimized tire compound means that the risk of skidding and hydroplaning on wet roads is
increased.
In addition, the tire grip is greatly reduced at a
low outside temperature and tire running tem-
perature.
Switch on the ESP n
and adapt your driv-
ing style accordingly.Use M M\fS tires at outside tempera-
tures of less than 50 °F (10 °C).Only use the tires for their intended pur-
pose.320Wheels and tires

Observe the following when selecting, installing
and replacing tires:
= Furthermore, the use of certain tire types in
certain regions and areas of operation can be
highly beneNcial.
= Only use tires and wheels of the same type
(summer tires, winter tires, MOExtended tires)
and the same make.
= Only install wheels of the same size (les and
right) on each axle.
It is only permissible to install a diMerent
wheel size in the event of a Oat tire in order to
drive to the specialist workshop.
= Vehicles with a tire pressure monitoring sys-
tem: all installed wheels must be equipped
with functioning sensors for the tire pressure
monitoring system.
= At temperatures below 45°F (7°C) use winter
tires or all-season tires marked M M\fS for
all wheels.
Winter tires provide the best possible grip in
wintry road conditions.= For M\fS tires, only use tires with the same
tread.
= Observe the maximum permissible speed for
the M\fS tire which is installed.
If the tire\bs maximum speed is below that of
the vehicle, this must be indicated by an
appropriate label in the driver\bs Neld of vision.
= Break in new tires at moderate speeds for the
Nrst 60 miles (100 km).
= Replace the tires aser six years at the latest,
regardless of wear.
= When replacing with tires that do not feature
run-Oat characteristics: vehicles with
MOExtended tires are not equipped with a
TIREFIT kit at the factory. Equip the vehicle with a TIREFIT kit aser replacing with tires that
do not feature run-Oat characteristics, e.g.
winter tires.
For more information on wheels and tires, contact
a qualiNed specialist workshop.
Be sure to also observe the following further rela-
ted subjects:
= Notes on tire pressure (  page 300)=
Tire and loading information placard
(  page 307)
= Tire size designation, load-bearing capacity,
speed rating and load index (  page 314)
= Tire pressure table (  page 302)
= Notes on the emergency spare wheel
(  page 328)
Notes on rotating wheels
&WARNING Risk of injury through diMerent
wheel sizes
Rotating the front and rear wheels can
severely impair the driving characteristics.
The wheel brakes or suspension components
may also be damaged.
Rotate front and rear wheels only if the
wheels and tires are of the same dimen-
sions.
Observe the instructions and safety notes on
"Changing a wheel" (  page 318)
Wheels and tires321

The wear patterns on the front and rear wheels
diMer:
= Front wheels wear more on the tire shoulder
= Rear wheels wear more in the center of the
tire
Do not drive with tires that have too little tread
depth. This signiNcantly reduces traction on wet
roads (hydroplaning).
On vehicles that have the same size front and rear
wheels, rotate the wheels according to the inter- vals in the tire manufacturer\bs warranty book in
your vehicle documents. If this is not available, rotate the tires every 3,000 to 6,000 miles(5,000 to 10,000 km), depending on the wear.Ensure that the direction of rotation is main-
tained.
Notes on storing wheels
When storing wheels, observe the following notes:
= Aser removing wheels, store them in a cool,
dry and preferably dark place.
= Protect the tires from contact with oil, grease
or fuel.
Overview of the tire-change tool kit*NOTE Mercedes-AMG vehiclesObserve the notes in the Supplement.
You could otherwise fail to recognize
dangers.
Apart from some country-speciNc variants, vehi-
cles are not equipped with a tire-change tool kit. Consult a qualiNed specialist workshop to Nnd out
which wheel change tools are necessary and
approved for changing the wheel on your vehicle.
You will require the following tools, for example, to
change a wheel:
= Jack
= Chock
= Lug wrench
= Alignment bolt
The tire-change tool kit is located in tool bag 1
in the trunk.
\bDepending on the vehicle equipment, the tool
bag may be located in other positions in the
trunk.\bWhen stowing the tool bag, make sure that it is adequately secured.
The tool bag contains:
= Jack
= Gloves
= Lug wrench
= Alignment bolt
= Folding chock
= Ratchet for jack
322Wheels and tires

Preparing the vehicle for a wheel change
Requirements
= The vehicle is not on a slope.
= The vehicle is on solid, non-slippery and level
ground.
= The required tire-change tool kit is available.
\bIf your vehicle is not equipped with the tire-
change tool kit, consult a qualiNed specialist
workshop to Nnd out about suitable tools.Apply the electric parking brake manually.Move the front wheels to the straight-ahead
position.Vehicles with automatic transmission: shis to
position ].Switch oM the vehicle.Make sure that the vehicle cannot be started.Place chocks or other suitable items under the
front and rear of the wheel that is diagonally
opposite the wheel you wish to change.If necessary, remove the wheel trim/hub caps
(  page 323).Raise the vehicle (  page 324).
Removing and installing the wheel trim/hub caps
Requirements
= The vehicle is prepared for a wheel change
(  page 323).
Wheel trim
The wheel trim covers the wheel bolts on vehicles
with steel wheels. Before unscrewing the wheel
bolts, remove the wheel trim.
To remove: using both hands, carefully reach
into two wheel trim openings and remove the wheel trim.To install: place the wheel trim in position and
press Nrmly until it engages.
Plastic hub cap
To remove:
Turn the center cover of the hub cap counter-
clockwise and remove the hub cap.
To install:
Make sure that the center cover of the hub cap is turned counter-clockwise.Position the hub cap and turn the center coverclockwise until the hub cap engages physically and audibly.Wheels and tires323

Aluminum hub cap
To remove:
Position socket 2 from the tire-change tool
kit on hub cap 1.Position wheel wrench 3 on socket 2.Using wheel wrench 3, turn hub cap 1
counter-clockwise and remove it.
To install:
Follow the instructions above in reverse order.\bSpeciNed tightening torque: 18 lb-s (25 Nm).Raising the vehicle when changing a wheel
Requirements
= There are no persons in the vehicle.
= The vehicle has been prepared for a wheel
change (  page 323).
Important notes on using the jack: = Use only a vehicle-speciNc jack that has been
approved by Mercedes-Benz to raise the vehi-
cle.
= The jack is only designed for raising and hold-
ing the vehicle for a short time while a wheel is being changed and not for maintenance
work under the vehicle.
= The jack must be placed on a Nrm, Oat and
non-slip surface. If necessary, use a large, Oat,
load-bearing, non-slip underlay.
= The foot of the jack must be positioned verti-
cally under the jack support point.
Rules of conduct when the vehicle is raised:
= Never place your hands or feet under the vehi-
cle.
= Never lie under the vehicle.
= Do not start the vehicle and do not release the
electric parking brake.
= Do not open or close any doors or the trunk
lid.
324Wheels and tires

Using the lug wrench, loosen the wheel bolts
on the wheel you wish to change by about one full turn. Do not unscrew the screws com-
pletely.
Position of the jack support points
*NOTE Mercedes-AMG vehiclesObserve the notes in the Supplement.
You could otherwise fail to recognize
dangers.&WARNING Risk of injury from incorrect
positioning of the jack
If you do not position the jack correctly at the
appropriate jacking point of the vehicle, the jack could tip with the vehicle raised.
Only position the jack at the appropriate
jacking point of the vehicle. The base ofthe jack must be positioned vertically
under the jacking point of the vehicle.*NOTE Damage to the vehicle due to the
jack
If you do not position the jack at the jack sup-
port points provided for this purpose, you
could damage your vehicle.
Only position the jack at the jack sup-
port points provided for this purpose.Take the ratchet out of the tire-change tool kit and place it on the hexagon nut of the jack so that the letters "AUF" are visible.Wheels and tires325

Position support 2 of jack 4 on jack sup-
port point 1.\bIf there is a total loss of pressure in a tire, it
may be possible that the jack cannot be posi- tioned at jack support point 1. In this case,
unload the vehicle.Turn ratchet 3 clockwise until support 2
sits completely on jack support point 1 and
the base of the jack lies evenly on the ground.Turn ratchet 3 until the tire is raised a maxi-
mum of 1.2 in (3 cm) from the ground.Loosen and remove the wheel (  page 326).
Removing a wheel
Requirements:
= The vehicle is raised (  page 324).
*NOTE Mercedes-AMG vehiclesObserve the notes in the Supplement.
You could otherwise fail to recognize
dangers.
When changing a wheel, avoid applying any force
to the brake discs, as this could impair the level of
comfort when braking.
*NOTE Damage to threading from dirt on
wheel boltsDo not place wheel bolts in sand or on a
dirty surface.Unscrew the uppermost wheel bolt com-
pletely.Screw alignment bolt 1 into the thread
instead of the wheel bolt.Unscrew the remaining wheel bolts com-
pletely.Remove the wheel.326Wheels and tires

Installing a new wheel
Requirements
= The wheel to be changed is removed and the
alignment bolt is screwed in (  page 326).
*NOTE Mercedes-AMG vehiclesObserve the notes in the Supplement.
You could otherwise fail to recognize
dangers.&WARNING Risk of accident from losing a
wheel
Oiled, greased or damaged wheel bolt/wheel
nut threads or wheel hub/wheel mounting
bolt threads can cause the wheel bolts/wheel nuts to come loose.
Never oil or grease the threads.In the event of damage to the threads,
contact a qualiNed specialist workshop
immediately.Have the damaged wheel bolts or dam-
aged hub threads replaced.Do not continue driving.Observe the information on the choice of tires
(  page 318).
For tires with a speciNed direction of rotation, an
arrow on the side wall of the tire indicates the cor-
rect direction of rotation. Observe the direction of rotation when installing.
Slide the wheel to be mounted onto the align-ment bolt and push it on.&WARNING Risk of injury from tightening
wheel bolts and nuts
If you tighten the wheel bolts or wheel nuts
when the vehicle is raised, the jack could tip.
Only tighten wheel bolts or wheel nuts
when the vehicle is on the ground.Be sure to observe the instructions and safety
notes on "Changing a wheel" (  page 318).For safety reasons, only use wheel bolts which
have been approved by Mercedes-Benz and
for the wheel in question.*NOTE Damage to paintwork of the wheel
rim when screwing in the Nrst wheel bolt
If the wheel has too much play when screwing
in the Nrst wheel bolt, the wheel rim paint can
be damaged.
Press the wheel Nrmly against the wheel
hub when screwing in the Nrst wheel
bolt.Tighten the wheel bolts evenly in a diagonal pattern in the order indicated until they are Nnger-tight.Unscrew and remove the alignment bolt.Tighten the last wheel bolt until it is Nnger-
tight.Lower the vehicle (  page 327).
Lowering the vehicle aser a wheel change
Requirements
= The new wheel has been installed
(  page 327).
Wheels and tires327

To lower the vehicle: place the ratchet onto
the hexagon nut of the jack so that the letters "AB" are visible and turn counter-clockwise.Tighten the wheel bolts evenly in a diagonalpattern in the order indicated 1 to 5 with
an initial maximum force of 59 lb-s (80 Nm).Tighten the wheel bolts evenly in a diagonal
pattern in the order indicated 1 to 5 with
the speciNed tightening torque of 96 lb-s
(130 Nm).&WARNING Risk of accident due to incor-
rect tightening torque
The wheels could come loose if the wheel
bolts or wheel nuts are not tightened to the
prescribed torque.
Ensure that the wheel bolts or wheel
nuts are tightened to the prescribed
tightening torque.If you are not sure, do not move the vehi-
cle. Contact a qualiNed specialist work-
shop and have the tightening torque checked immediately.Check the tire pressure of the newly installed
wheel and adjust it if necessary.\bThe following does not apply if the new wheel is an emergency spare wheel.Vehicles with a tire pressure loss warning sys-tem: restart the tire pressure loss warning sys-
tem (  page 306).Vehicles with a tire pressure monitoring sys-
tem: restart the tire pressure monitoring sys-
tem (  page 305).Emergency spare wheel
Notes on the emergency spare wheel
&WARNING Risk of accident caused by
incorrect wheel and tire dimensions
The wheel or tire sizes and the tire type of the
emergency spare wheel or spare wheel and
the wheel to be replaced may diMer. The emer-
gency spare wheel or spare wheel can signiN-
cantly impair driving characteristics of the
vehicle.
To prevent hazardous situations:
Drive carefully.Never install more than one emergency
spare wheel or spare wheel that diMers
in size.Only use an emergency spare wheel or spare wheel brieOy.Do not deactivate ESP n
.Have the emergency spare wheel or
spare wheel of a diMerent size replaced
at the nearest qualiNed specialist work-328Wheels and tires