RBSM Viper User manual

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Dear Customer
In purchasing this bicycle you have chosen a product of high quality and technology. Each com-
ponent of your new bicycle has been designed, manufactured and assembled with great care
and expertise.
These operating instructions contain a wealth of information on the proper use of your bicycle,
its maintenance and operation as well as interesting information on bicycle design and engineer-
ing. Please read these instructions thoroughly. We are sure that even if you have been cycling
all your life you will nd useful and detailed information.
Bicycle and E-bike technology has developed at a very rapid pace during recent years. There-
fore, before setting off on your new bicycle, be sure to read at least the chapter “Quick start”
rst.
The individual steps are subsequently explained in detail, supplemented by illustrations and
diagrams.For more detailed information on your E-bike, refer to “Technical data”.
Even a manual as big as an encyclopedia could not describe every possible combination of
bicycle models and components or parts on the market. These operating instructions therefore
focus on your newly purchased bicycle and standard components and provide useful informa-
tion and warnings.
When doing any adjusting or servicing, be aware that the detailed instructions and information
provided in these operating instructions only refer to this city/road/mountain bicycle or E-bike.
The information included here is not applicable to any other bicycle type. As bicycles and E-bike
come in a wide variety of designs with frequent model changes, the routines described may re-
quire complementary information. Comply also with the instructions of the parts manufacturers,
which you can nd on the enclosed information.
Be aware that these instructions may require further explanation, depending on the experience
and/or skills of the person doing the work. For some jobs you may require additional (special)
tools or supplementary instructions. This manual cannot teach you the skills of a bicycle me-
chanic.
This manual cannot teach you howto ride. Please be aware that cycling is a hazardous activity
that requires the rider to stay in control of his or her bicycle at all times.
Like any sport, cycling involves the risk of injury and damage. Keep this in mind. When you
decide to ride a bicycle or E-bike you need to accept the risk inherent to cycling.
WARNING:
This symbol indicates an imminent risk to your life or health, unless you comply with the
corresponding handling instructions, given or take preventive measures.
CAUTION:
This symbol warns you of incorrect actions that could result in damage to property and
the environment.
NOTE:
This symbol provides you with information about how to handle the product or refers to
a passage in the operating instructions that deserves your special attention.

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Content
The bike and its components....................................................................................5
I. SAFETY WARNINGS....................................................................................7
I-1. Basic safety information.................................................................................7
I-2. For your own safety .......................................................................................7
I-3. Jnformation for parents and legal guardians .................................................7
I-4. Safety in road trafc.......................................................................................7
I-5. Bike safety .....................................................................................................8
II. Quick Start Guide: .......................................................................................9
III. Setting up the bike for the rider ...............................................................10
III-1. Fitting the pedals .........................................................................................10
III-2. Adjusting the seat position...........................................................................10
III-3. Adjusting the handlebar position..................................................................12
IV. Frame ..........................................................................................................13
V. Headset.......................................................................................................13
VI. Fork .............................................................................................................14
VII. Chain rings .................................................................................................14
VIII. Bottom bracket and cranks ......................................................................14
IX. Wheels ........................................................................................................14
IX-1. Checking the wheels....................................................................................14
IX-2. Checking the hubs .......................................................................................15
IX-3. Checking the rims ........................................................................................15
IX-4. Tyres............................................................................................................15
X. Brake, brake levers and brake systems ..................................................16
X-1. Important information and precautionary measures ....................................17
X-2. Brake lever...................................................................................................17
X-3. Disc brakes ..................................................................................................18
XI. Bike gears...................................................................................................20
XI-1. Derailleur gears ...........................................................................................20
XI-2. Shifting lever ................................................................................................21
XI-3. Rear derailleur .............................................................................................22
XII. Bike chain...................................................................................................23
XIII. Electric system ..........................................................................................24
XIII-1. E-bike fundamental legal principles .............................................................24
XIII-2. These statutory requirements apply for a E-bike .........................................24
XIV. Control panel (display)..............................................................................25
XIV-1. Product model..............................................................................................25
XIV-2. Specications...............................................................................................25
XIV-3. Appearance and Size ..................................................................................25
XIV-4. Function Summary.......................................................................................26

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XIV-5. Features.......................................................................................................26
XIV-6. General Operation .......................................................................................27
XIV-7. Settings........................................................................................................31
XIV-8. Quality Assurance and Warranty Scope......................................................34
XIV-9. Operation Cautions......................................................................................35
XV. Assistance by the electric motor .............................................................36
XV-1. Operating principle of assistance.................................................................36
XV-2. Distance.......................................................................................................36
XVI. Battery ........................................................................................................36
XVI-1. Straightforward charging..............................................................................37
XVI-2. High degree of safety due to battery management......................................37
XVI-3. Straightforward storage ...............................................................................37
XVI-4. Battery information system ..........................................................................38
XVI-5. Service life and warranty .............................................................................38
XVI-6. Battery Holder..............................................................................................38
XVII. Charger .......................................................................................................39
XVII-1. Structure Diagram of Charger......................................................................39
XVII-2. Charge Curve Graph ...................................................................................39
XVIII. Care and maintenance of the bike ...........................................................40
XVIII-1. Care .............................................................................................................40
XVIII-2. Wear parts ...................................................................................................40
XVIII-3. Tires.............................................................................................................41
XVIII-4. Rims in conjunction with rim brakes ............................................................41
XVIII-5. Brake pads...................................................................................................41
XVIII-6. Brake discs ..................................................................................................41
XVIII-7. Bike chains or toothed belts.........................................................................41
XVIII-8. Chain rings, sprocket wheels and jockey wheels ........................................41
XVIII-9. Lamps of lighting set....................................................................................41
XVIII-10. Handlebar tapes and handle grips...............................................................42
XVIII-11. Hydraulic oils and lubricants ........................................................................42
XVIII-12. Gear-shift and brake cables.........................................................................42
XVIII-13. Paint nishes ...............................................................................................42
XVIII-14. Bearings.......................................................................................................42
XIX. Regular inspections ..................................................................................42
XX. Technical data............................................................................................43
XX-1. Maximum permitted gross weight of bike ....................................................43
XX-2. Tightening torques for screw connections ...................................................43
XX-3. Tires and tire pressure.................................................................................44
XXI. Warranty conditions ..................................................................................44
XXI-1. Prerequisites for the validity of warranty claims...........................................45
XXI-2. Warranty exclusions ....................................................................................45

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The bike and its components
Mud Adder
Whole Vehicle Mark
1. Tire 2. Rim 3. Spoke 4. Front fork 5. Stem
6. Saddle post clamp 7. Saddle post 8. Saddle 9. Battery
10. Flywheel 11. Derailleur 12. Chain 13. Crank 14. Pedal
15. Disc Brake 16. Handle bar 17. Hand grip 18. Derailleur shifter
19. Displayer 20. Brake lever

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Whole Vehicle Mark
1. Tire 2. Rim 3. Spoke 4. Front fork 5. Stem
6. Saddle post clamp 7. Saddle post 8. Saddle 9. Battery
10. Flywheel 11. Derailleur 12. Chain 13. Crank 14. Pedal
15. Disc Brake 16. Handle bar 17. Hand grip 18. Derailleur shifter
19. Displayer 20. Brake lever
Viper

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Preface
Keep in mind that every bicycle type is built for a specic intended use. Be sure to use your bi-
cycle only according to its intended use, as it may otherwise not withstand the stress and would
fail and cause an accident with unforeseeable consequences!
1. City/Road E-BIKE are intended for hard-surface roads, i.e. for tarred roads and bicycle
lanes or gravel eld tracks. Observe the trafc rules when cycling on public roads. City/road
bicycle are not suitable for off-road use. Using bicycle off-road can result in crashes with
unforeseeable consequences.
2. Mountain bike are suitable for off-road use; they are, however, not designed for dual, dirt,
downhill and free-ride cycling etc.
All regulations that apply to bicycles, also apply to E-bike, i.e. they are allowed to or must use
cycle paths without any restrictions. Wearing a helmet is recommended, but not compulsory.
I. SAFETY WARNINGS
I-1. Basic safety information
Please read all the warnings and information in this User Manual carefully before using the bicy-
cle. Keep this User Manual near your bicycle for ready reference. If you lend this bicycle over to
someone else, don’t forget to give them the User Manual as well.
I-2. For your own safety
WARNING:
• Wearbrightclothingorreectiveelementssothatotherroaduserscanseeyouin
good time.
• Wear shoes with a stiff, and whenever possible, non-slip sole.
• Wearclose-ttingclothingonyourlegs,orweartrouserclips.
• Wearprotectiveclolingsuchasrobustshoesandgloves.
I-3. Jnformation for parents and legal guardians
NOTE:
• Make sure ttiat your child has been taught, and also understands, how to handle the
bike safely and responsibly in the environment in which it is going to be used.
• Explain to your child how to operate all the brakes, and also how they work and any
special features.
• As the legal guardian, you are responsible for the safety of your child and any dam-
age he/she may cause when cycling. You should therefore make absolutely sure that
the bike is in technically sound condition and adjust it regularly to Itie size of the
child.
I-4. Safetyinroadtrafc
NOTE:
• Observetheapplicabletrafcregulations.
• Never ride with no hands!
• In some countries children below a certain age must ride on the pavement and must
also dismount when crossing the road. Please familiarize yourself with the applicable

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regulations.
• Adjust your handling on wet or slippery roads; ride more slowly and brake carefully
and in good time as you will require a much greater braking distance.
• Adoptaspeedthatreectstheterrainaswellasyourridingability.
• Do not listen to music through headphones when cycling.
• Do not cycle when using a mobile phone.
• Use designated cycle paltis when not using public roads.
• Be ready to brake, especially if you are not sure what lies ahead or are riding downhill
I-5. Bike safety
NOTE:
• Only bikes that have been approved for use in public places, as per the applicable
regulations (e.g. StVZO in Germany), may be used.
• Observe the maximum permitted gross weight of the various bike types, as this could
otherwise lead to breakage or failure of safety-relevant components. The brake sys-
tem is also only designed for ttie maximum permitted gross weight of the bike. For a
list of the maximum permitted gross weights, refer to bike “Technical data’.
The gross weight is the sum of the weight of the bike + weight of the rider + weight of
the luggage. The gross weight also includes towed weights such as trailers.
• If you notice that a part is damaged or warped, do not use the bike until you have had
the part replaced as otherwise parts that are important to operation of the bike may
fail.
• Observe the maximum load-carrying capacity of the rack. This is marked on tine rack
directly.
• Ifyoumaketechnicalchangestoyourbike,takethenationaltrafcregulationsand
applicable standards into account. Bear in mind that this could render your warranty
invalid.
• Only replace electrical components on your bike with type-tested parts. Disassemble
the battery pack and modify the unit or your warranty will be void and you will be
responsibleforthemodication.
• Only ride with suitable lighting in unfavorable lighting conditions such as fog, rain,
dawn light or in the dark.
• Perform care and maintenance on your bike regularly. In doing so, check important
components, particularly the frame, fork, wheel suspension, handlebar, handlebar
stem, seat post and brakes for warping and damage. If you notice changes such as
cracks, bulges or warping, have your bike checked by a specialist cycle shop before
using again.

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II. Quick Start Guide:
8stepstogettingontheroad(Beforetherstride)
CAUTION: E-BIKE OWNERS:
Donotusethebatteryforthersttimeuntilithasbeenfullychargedatleastonceoryou
may decrease its perform¬ance (see instructions below).
1. Unpack the bike and check the contents
Carefully remove your bicycle and all other items from the box. You may nd it easier to open
the side of the box and roll the bike out. Ask for assistance if required.
Please check that ttie following contents, as well as any accessories you may have ordered, are
present:
- Correct model, size and style of bicycle
- Pair of pedals (marked L and Ron the end of the spindle) (Except Foldable Bike)
- Bike manuals
- Battery Charger (E-bike Only)
2. Charge the battery (E-bike Only)
Once the bike is out of the box, put the kickstand down. You can charge the battery pack on
or off the bike. To remove the battery, insert key into the keyhole near the battery and turn to
unlock, pick out battery.
NOTE: Connect the charger to the bicycle when it is not used. This will lengthen the life of the
battery pack.
1. Connect the charger to the mains voltage. The charge indicator of charger will show green.
2. Connect itie plug of 1he charger to the contact point of battery pack, the charge indicator of
charger will shew red.
3. When the charge indicator of charger show from red to green. The battery pack is full.
4. Remove the charger before you start cycling.
NOTE: The battery does not have to be completely discharged before it is recharged. The Lith-
ium battery has no ‘ memory’ and therefore can be charged at any time. It is perfectly
acceptable to recharge the battery after a short ride so that the battery is fully charged
before the next ride.
3. Attach the pedals (If need)
Screwing the right pedal into the left crank arm and/or vice versa will seriously damage pedal
and/or crank arm Itireads and void the warranly.
Apply grease to the threaded end of each pedal. Take care to put ttie correct pedal on each
crank arm (Land R are marked on the ends of the pedal spindle) and carefully tighten using the
supplied pedal wrench. Both pedals (each side L and R) thread toward the front of the bike to
tighten, and toward tine back of the bike to loosen.
4. Acljust the handlebars
Holding the tire in place, straighten the handlebars by loosening the nut(s) on top of the han-
dlebar stem or the two nuts on either side of handlebar stem witti an Allen key. Then align the
handlebars witti the frame and front tire. Tighten the single nut at top of the handlebar stem or
tighten the two nuts on either side of handlebar stem depending on your model. To adjust the
handlebar tilt or height, loosen the nut(s) on the side or front of the handlebar joint and adjust
the handlebars to a comfortable position before tightening. Consult the manual to determine the

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correct handlebar height. Check to make sure the brake levers, gear shifts, displayer, bar ends
and other parts attached to the handlebars are positioned comfortably. These can all be adjust-
ed using one of the included Allen keys.
5. Adjust the seat
Using an Allen key, loosen the nut on the side of the seat post clamp. Straighten and set the
saddle to the correct height and tighten the seat post clamp. If you are not sure what the ideal
height is, refer to the manual for guidance. Do not set the seat so high that the max guide line
on the seat post is visible.
6. Check and adjust the tire pressure
Check the tire pressure and inate to proper pressure marked on the tire sidewall.
7. Power on the bike (E-bike only)
Before you ride, insert the battery in the battery holder until it locks in place, and remove the
key. Turn on the bike’ s pedal assist system the handlebar control unit. You should not be pedal-
ing when turning on the power. If the battery is fully charged, all lights next to the power button
will be lit. See manual for more information on modes. As you pedal, the motor will provide
assistance at the selected power level
8. Check the lights
Check light function. See manual for more information on how to turn on/off.
After its initial break-in period, you might notice that frie shifting and braking need adjustment.
This is typical of all new bicycles and simply reects that cables have stretched or their housings
have seated themselves into nal position. To keep running at peak performance, we recom-
mend that you take your bicycle to your local bike shop as soon as you notice inconsistencies in
your gears or brakes or experiencing any other difculties.
III. Setting up the bike for the rider
III-1. Fitting the pedals
• Coat both pedal threads with lubricant (grease).
NOTE: The left pedal has a left-handed thread which is normally indicated by an “L” embossed
on the axle. The right pedal has a right-handed thread which is normally indicated by an
embossed “R”.
• Screw the left pedal anticlockwise into the left crank.
• Screw the right pedal clockwise into the right crank (on the side of the bike chain).
III-2. Adjusting the seat position
III-2.1: Adjusting the bike saddle
The seat position is decisive for your well-being and cycling performance

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III-2.2: Operating the quick-release device
WARNING:
• All quick-release devices must be tightened securely before
you set off. Check this before every journey.
• If you leave your bike unattended, check that all quick-release
devices are correctly secured before setting off again.
• When closing the quick-release lever to lock it, it must be
necessarytoapplyaforcethatcausesyoutomakearst
with your hand as otherwise the quick- release device could
come loose.
To open the quick-release device, proceed as follows:
• Throw back the quick-release lever so that its inner face or the
lettering •Open the quick-release device as far as possible.
• Turn the adjusting nut anticlockwise to further slacken the
quick-release device.
To close the quick-release device, proceed as follows:
• Adjust the clamping strength by turning the adjusting nut.
• If the quick-release device closes too easily, open it again and
turn the adjusting nut clockwise.
• If the quick-release device still closes too easily repeat the previous step.
• If the quick-release device is too difcult to close, turn the adjusting nut anticlockwise.
• Turn back the quick-release lever from the OPEN position so you can see the outer side of
the lever or the lettering CLOSE.PEN is visible.
WARNING:
Whenclosed,quick-releaseleversmustlieatagainsttheframe,forkandsaddleclamp.
Make sure friat quick-release devices for frie hubs point backwards when closed as of-
rierwise they could snag on obstructions when the bike is moving and open. This could
lead to serious accidents.
III-2.3: Determining the correct saddle height
• Sit on the bike saddle.
• Try to reach the pedal with your heel when It is in the bottom
position. Your knee should be more or less fully straightened
out.
• Place the balls of your feet on the centre of the pedal.If your
knee is now slightly bent, the saddle height is correct.
WARNING:
Never tighten the seat post rf the maximum mark or stop mark
is above the top of the | seat tube as otherwise you could injure
yourselfordamagetheseatpost.Alwaysobservethespecied
tightening torques.
CAUTION:
The minimum insertion depth is marked on the seat post. If this is not the case, the mini-
mum insertion depth must be 7.5 cm. In frames with long seat tubes that project beyond
the top tube, the minimum insertion depth is 10cm.

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III-2.4: Adjusting the saddle angle
• Your bike saddle should be as close as possible to horizontal.
• You can make use of longer bike rides to nd out what your most
comfortable seat position is. If you want to tilt the saddle, try tilting
it very slightly forwards. If you tilt the saddle back, this can quickly
lead to pain or physical injury.
Adjust the saddle angle as follows:
• Turn the clamping screw anticlockwise to loosen it.
• Titt the bike saddle to the required angle.
• Turn the clamping screw clockwise to tighten it.
With a suspension seat post
Suspension seat posts reduce vibrations caused by uneven roads thereby reducing stress on
the spinal column.
If you need to adjust the suspension elements in the seat post, consult your specialist cycle
shop.
III-3. Adjusting the handlebar position
WARNING:
Tighten all screws to the prescribed torque as otherwise screws could shear off and
components could come loose or detach altogether.
You can also inuence your riding position by changing the handlebar height.
The lower you set the handlebar, the further you will have to lean forwards. This increases the
strain on your wrists, arms and upper body and you will need tobend your back further.
The higher the handlebar is, the more upright your riding position will be. This increases the
stress on your spinal column due to jolting.
You can determine a handlebar height that best suits your body size as follows:
III-3.1: Adjusting the handlebar position by turning the handlebar
Loosen the hexagon socket screws on the front of the stem. Turn the hand
lebar until you nd the position that is comfortable for you. Make sure that
the handlebar is always exactly in the centre of the stem. Now retighten
the hexagon socket screws by turning them clockwise. If the tightening
torque is stamped on the stem, use this value, and If not, use the tighten-
ing torques in Technical data”.
Once you have adjusted the handlebar, you will also need to adjust the
brake levers and gear-shift handles. Loosen the hexagon socket screws
on the handle grips. Sit on the saddle and put your nger on the lever.
Turn the lever until your hand and lower arm are in a straight line. Retighten the screws in the
handle grips by turning them clockwise.
III-3.2: Adjusting the handlebar height with an adjustable handlebar stem (If the
E-BIKE is equipped with the adjustable handlebar)
With some types of handlebar stems, you can vary the handlebar tilt. The stem angle can be ad-
justed via the clamping screws which are on the side of the articulation or the top/bottom of the
stem. Models equipped with additional stop notches or adjusting screws are available.

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Adjust the handlebar tilt as follows:
• Undo the clamping screw by turning it anticlockwise through two or
three revolutions using an Allen key.
• If you own a model that is also equipped with detents, continue turning
the c lamping screw anticlockwise to disengage the detents.
• If you own a model with integrated stop notch, loosen the screw of the
stop notch. In many stem types this is located on the underside of the
stem.
• Tift the handlebar stem to the required angle.
• To fasten the handlebar stem, tighten the clamping screw clockwise using an Allen key. If
tightening torques are specied on the stem, use exactly these torques, and if not, refer to
the table of tightening torques in.
• In models with an integrated stop notch, tighten the screw of the stop notch carefully clock-
wise. In doing so, the stop notch must engage with the teeth.
IV. Frame
The form of the frame depends on the bike type and function. Frames are manufactured from
different materials- steel or aluminum alloys or carbon (carbon ber), for example.
NOTE:
The frame number of the bike is stamped on the seat tube,the
head tube or the bottom bracket housing.It may also be found
onthemotorsuspensioninE-bike.Thebikecanbeidentied
the frame number if it is stolen. To identify the bike properly,it
is important to note down ttie whole number in the right order.
WARNING:
Never ride your bike if tine frame is warped or cracked. On no account should you at-
tempt to repair damaged parts. This can lead to accidents. Replace defective parts before
you ride the bike again. After an accident or crash, have your bike checked by a profes-
sional bike workshop before riding it again. If defects on the frame or components go un-
noticed this can lead to accidents. If your bike does not roll forwards easily in a straight
line, this could mean that the frame is warped. In this case, have the steering stability
checked by a professional bike workshop.
V. Headset
The headset is the bearing for the bike fork in the frame. If the headset has
been properly adjusted, it will turn easily. In doing so, no play should be
evident.
The headset is subject to a large amount of stress due to impacts with the
road surface.
This can cause it to come loose or affect Its setting. Have the play and
ease of movement of the headset checked regularly by your specialist
cycle shop.

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WARNING:
Checking the headset
If you do not adjust the headset properly or tighten it too tightly, this could cause bre-ak-
ages.
This should therefore always be carried out by a professional bike workshop.
If you ride with the headset loose, Unis could damage the bearing shells or fork.
VI. Fork
The front wheel is held in place by the bike fork. The bike fork consists of two fork blades, the
fork crown and steering tube.
The suspension fork is a feature of most mountain bikes, trekking bikes and city bikes. They can
be adjusted in different ways and provide a greater degree of riding comfort.Speclc information
on your suspension fork is provided in the manufacturer’s operating instructions which you can
nd on the CD or the manufacturer’s website.
WARNING:
Never ride with a damaged bike fork. Do not attempt to repair
a defective bike fork. This can lead to serious accidents.
If you notice that the bike fork is warped or otherwise dam-
aged, replace it before using the bike again.
Avoid sudden changes in ground level and riding off high
kerb stones. This can damage the fork and lead to serious
accidents.
Check regularly that the screws on the bike fork are securely fastened. If screws are
allowed to come loose, this can cause serious accidents.
VII. Chain rings
Chain rings are wear parts. Their service life depends on various factors, e.g.
• Maintenance and care,
• Type of use and distance travelled.
VIII.Bottom bracket and cranks
WARNING:
The cranks must be securely fastened as this could otherwise damage the crank set.
• The cranks can come loose which is why you should regularly check whether they
are securely fastened by attempting to rock
• If there is play in the cranks, have the bike checked and the cranks fastened securely
by a professional bike workshop.
IX. Wheels
IX-1. Checking the wheels
The wheels connect the bike with the surface you are riding on. The wheels are subject to a par-

15
ticularly high level of stress due to unevenness of the riding surface and the weight of the rider.
The wheels are carefully checked and trued prior to delivery. However, the spokes may settle
when you ride the rst kilometer on your bike.
• Have the wheels checked again and trued if necessary after the rst 100 kilometer by a
specialist cycle shop.
• You should subsequently regularly check the tension in the spokes and have loose or dam-
aged spokes replaced, and/or have the wheel trued, by a specialist cycle shop.
• The wheel can be attached to the frame and fork in a number of different ways. In addition
to the standard systems in which the wheel is held on by axle nuts or quick-release devices,
different types of oating axles exist. These can be held in place by a screw connection or
different types of quick-release devices. If your bike has a oating axle, please also refer to
the enclosed manufacturer’s user manual or visit the web pages of the relevant manufactur-
er in the Internet.
WARNING:
Tighten all screws to the prescribed torque as otherwise screws could shear o’ and com-
ponents could come loose or detach altogether.
IX-2. Checking the hubs
To check the hub bearings, proceed as follows:
• Lift the wheel and spin it.
• Check whether the wheel continues to turn through several revolutions before it stops mov-
ing. If it stops suddenly, the bearing is damaged. This does not apply for front wheels with
hub dynamos.
• To determine whether there is play in the hub bearing, try rocking the wheel in the bike fork
or rear triangle backwards and forwards perpendicular to the direction of travel.
• If you notice friat there is play between the bearings or rf you encounter resistance when
turning the wheel, have the hub bearing adjusted by a specialist cycle shop.
IX-3. Checking the rims
If you are using a rim brake, the rim is subject to a higher degree of wear.
WARNING:
If a rim is worn it loses stability which makes it more susceptible to damage. If the rim is
deformed, cracked or broken this can lead to serious accidents. If you notice changes
in a rim on your bike, do not ride on it. Have the problem checked by a professional bike
workshop.
IX-4. Tyres
A large number of different tyre types exist. The bike’s off—road capability and rolling resistance
depend on tread prole.
WARNING:
Only inate the tyre to the maximum permissible tyre pressure as otherwise it may burst. Inate
the tyre at least to the specied minimum air pressure. If the tyre pressure is too low, the tyre
may detach from the rim.
The maximum permissible tyre pressure, and normally also the minimum permissible pressure,
can be found on the tyre sidewall.

16
Always replace the tyre with a tyre of the same type, dimension and prole as otherwise the ride
characteristics may be adversely affected. This can lead to accidents.
CAUTION:
Tyres are wear parts. Check the tread depth, tyre pressure and condition of the tyre side-
walls regularly. Replace worn tyres before using the bike.
Note:
Note the dimension of the tted tyre. Standard designations are used when stating the tyre
dimension.
• Example 1: “46-622” means the tyre is 46)mm wide and the rim diameter is 622)mm.
• Example 2: “28 x 1.60 inches” means that the tyre diameter is 28 inches and the tyre width
is 1.60 inches.
• The tyre pressure is frequently stated in PSI. Technical data” contains a table which you can
use to convert tyre pressures from PSI into bar.
IX-4.1: Inner tubes
The inner tube is necessary to maintain the pressure inside the tyre. It is inated via a valve.
Three valve types exist:
All three have a cap to protect them from
ingress of dirt.
To inate an inner tube with a Sclaverand or
road valve, proceed as follows:
• Unscrew the valve cap anticlockwise
with your ngers.
• Unscrew the knurled nut anticlockwise.
• Push the knurled nut with your nger briey into the valve until air escapes.
• Inate the inner tube using a suitable tyre pump.
• Screw the knurled nut back down.
• Screw the cap clockwise back onto the valve.
NOTE:
Ask a specialist cycle shop for advice on which tyre pump is suit-
ableforyourvalveToinateaninnertubewithaDunlop/Woods
valve or Schrader/car valve proceed i follows:
• Unscrew the valve cap anticlockwise.
• Inatetheinnertubeusingasuitabletyrepump.
• Screw the cap clockwise back onto the valve.
X. Brake, brake levers and brake systems
This User Manual describes the maintenance and handling of typical, commercially available
brake components for MTB, ATB, cross and road bikes. For other components, refer to the
separate information or enclosed instructions. If you have questions on installation, adjustment,
maintenance and operation, please consutt a specialist cycle shop.

17
X-1. Important information and precautionary measures
WARNING:
Have maintenance work on t\e brakes carried out by a professional bike workshop.
Donotallowuidscontainingoilstocomeintocontactwiththebrakepads,brakecon-
tact surfaces on the rim, brake blocks or brake disc as this could otherwise impair the
effectiveness of the brake.
Brake blocks and brake pads are wear parts. Check the wear condition of these parts reg-
ularly.Thiscanbeidentiedbyamarking.OnthebrakeblocKforexample,thegrooves
will no longer be visible. Always replace both brake blocks at the same time.
Use genuine spare parts only as otherwise you could impair the functions of the bike or
damage it.
To obtain correct friction pairing, only use brake pads that are suitable for the rim as oth-
erwise the braking distance would be extended and wear increased. With carbon rims in
particular, only brake pads that are expressly intended for this purpose should be used.
Rubber brake blocks and brake pads must not come into contact with oil or grease. If the
rubber brake blocks and brake pads come into contact with oil or grease, this drastically
reduces their braking performance and they must be replaced.
WARNING:
Tighten all screws to the prescribed torque as otherwise screws could shear o’ and com-
ponents could come loose or detach altogether (see Technical data”).
NOTE:
Brake cables are wear parts. You should check the wear condrtion of the brake cables
regularly and replace these rf necessary. Check the brake cable for rust and fraying and
replace the cable If It is faulty. If you do not, the brakes could matfunction.
There are different types of brakes, the type of brake depends on what rt is used for:
• Hub brakes
• Disc brakes and
• Rim brakes
The brakes can be operated mechanically or hydraulically.
WARNING:
With hub gears, the brake lever that operates the front wheel brake is normally on the
right-hand side, and with derailleur gears It is on the left. Remind yourself of the position
of the brake lever before you ride off.
If you wish to attach the brake lever on the opposite side of the handlebar, follow the
manufacturer’s user manual or ask your specialist cycle shop to do this.
X-2. Brake lever
Standard brake lever
The bike is equipped as standard with a suitable brake lever.
Check regularly that when you operate the brake lever it does not
reach the handlebar and make contact with rt. With the brake lever
pulled, push the bike forward and check whether the braking perfor-
mance is sufcient. If the bike rolls slightly forwards, you will need
to have the brake cable readjusted or the brake pads replaced.

18
X-3. Disc brakes
With this brake type, the brake discs are on the hub and the brake caliper is on the frame or
fork.
WARNING:
Have your disc brakes adjusted by a specialist cycle shop. If
this is done incorrectly, an accident may occur.
Once the brakes have been adjusted, always perform a brake
test by pushing the bike quickly forwards and operating the
brake lever. You should only use your bike if you can safely
stop it using the brakes.
Disc brakes require a brake lead time during which the braking
force increases. Bear this oi in mind throughout the entire brake
lead time. The same effect also occurs after replacing the brake
block or disc.
If you hear unusual noises when braking, the brake blocks may have reached their wear
limit. Allow the brakes to cool down then check the brake block depth. Have the brake
blocks replaced if necessary.
WARNING:
When installing, removing and carrying out maintenance on the
wheel,donottouchthebrakediscwithyourngerswhenrtis
turning.Youcouldbeseriouslyinjuredrfyoucatchyourngers
in the cutouts of the brake disc.TTie brake caliper and the disc
can become - extremely hot when braking. You should therefore
not touch these parts when riding the bike or immediately after
dismounting as you could burn yoursetf. Before adjusting the
brakes,checkthatthepartshavecooleddownsufciently.
NOTE: You must only t a disc brake on your bike providing suitable mounting devices are
installed on the frame and the bike fork. If in doubt, consult a specialist cycle shop.
If the brake blocks come into contact with oil or grease, they must be replaced. If the
brake disc comes into contact with oil or grease, it must be cleaned as otherwise its
braking performance will be drastically reduced.
Check whether the quick-release lever for the wheel is on the side opposite the brake
disc. If the quick-release lever is on the same side as the brake disc, there is a danger
you could bum yourself when operating the lever. Ihe heat in the brake disc could also
reduce the clamping force of the quick-release device.
If the brake disc is worn, cracked or bent it must be replaced. Have this work carried out
by a professional bike workshop. If the depth of the brake blocks is less than 0.5mm,
they must be replaced.
X-3.1:Hydraulic disc brake
The hand brake lever of the hydraulic disc brake is equipped with a master cylinder. The hy-
draulic uid is fed through a tube to the brake cylinders. This actuates the brake pistons which
push the brake blocks against the brake disc. This type of brake requires little maintenance and
can be very powerful.

19
WARNING:
Once the brakes have been adjusted, always perform a brake test by pushing the bike
quickly fbrwards and operating the brake lever. You should only use your bike if you can
safely stop it using the brakes.
Check regularly, also before each journey, that the lines and connections are tight. If
linesandconnectionsarenottight,brakeuidmayescapefromthebrakesystem.The
brake may not work properly as a result.
Ifuidescapesfromthebrakingsystem,donotusethebikeandhavethenecessary
repair work carried out immediately by a professional bike workshop.
If you continue riding the bike in this condition, the risk of brake failure is extremely like-
ly.
If the brake blocks come into contact with oil or grease, they must be replaced. If the
brake disc comes into contact with oil or grease, it must be cleaned as otherwise its
braking performance will be drastically reduced.
X-3.2:Vapor bubble formation
• Vapor bubble formation can occur if the brakes are operated continuously for some time, e. g.
during a long steep descent.
Instead of applying gentle pressure continuously with the brakes, operate them for shorter
periods, with more force rf necessary, releasing the brake lever intermittently.
• Vapor bubbles form if water in the brake uid heats up, evaporates and forms bubbles in the
brake system.
As these are easily compressed, the brake lever travel distance increases.
WARNING:
When transporting or storing the bike upside down, air bubbles can form in the brake
systemuidreservoir.
If you then use the bike, the brakes could fail and cause a serious accident.
Once the bike is in the correct riding position, pull the brake lever several times to check
whether the brakes respond normally.
NOTE:
Brake pads and brake blocks are wear parts. Have the brake pads of hydraulic disc
brakes checked regularly, and replaced if necessary, by a professional bike workshop.
If not, adjust them as follows:
• Adjust the brake lever sort is parallel to the ground and operate it slowly several times so
the bubbles return to the reservoir.
• If the response is still poor, the brake system must be vented. Have this work carried out by
a specialist cycle shop.
X-3.3:Cleaning the brake system
If the brake blocks come into contact with oil or grease, they must be replaced. If the brake disc
comes into contact with oil or grease, rt must be cleaned as otherwise its braking performance
will be drastically reduced.
• Clean and maintain the brake system using isopropyl alcohol, soapy water or a dry cloth. Do
not use commercially available brake cleaning agents or agents to prevent braking noises
as these can damage components such as the seals.

20
X-3.4:Fitting/removing the wheel
• When removing the wheel, we recommend you use a brake block spacer. This prevents the
piston from being pushed out if the brake lever is operated once the wheel has been re-
moved. This also prevents air bubbles in the expansion vessel from entering the system.
• If the brake lever is operated and the brake block spacer is not inserted, the pistons may ex-
tend further than normal. Put the bike in an upright position to push back the brake blocks.
Use a clean at screw driver or tyre lever and be careful not to scratch the brake blocks.
If the brake blocks are not tted, push the piston back carefully without damaging it. If you
have trouble pushing back the brake blocks or piston, remove the reservoir cap and try
again. Note that some oil may ow out the reservoir.
• After tting the wheel, check that the quick-release lever is on the side opposite the brake
disc. If it is on the same side as the brake disc, there is a danger of the lever and brake disc
obstructing one another and this could also reduce the clamping force of the quick-release
device.
XI. Bike gears
XI-1. Derailleur gears
This User Manual describes the handling of typical, commercially available gear-shift compo-
nents for MTB, ATB, cross. Separate instructions are provided for other components on the CD
or on the web pages of the relevant manufacturer in the Internet. If you have questions on instal-
lation, adjustment, maintenance and operation, please consult a specialist cycle shop.
WARNING
If gear-shift components are loose, worn, damaged or adjusted incorrectly, this poses a
risk of injury to the rider. Have the derailleur gears adjusted at a professional bike work-
shop.
NOTE: Always contact your specialist cycle shop if the chain jumps o’ the chain rings or sprock-
ets when riding or you hear unusual noises or you cannot change gears easily or the
rear derailleur, front derailleur or other gear-shift components are loose, damaged or
distorted or • chain links are defective or worn.
WARNING:
The bike chain must not be on the smallest chain ring at the front and the small outer
rear sprocket wheel simultaneously. The bike chain must not be on the largest chain ring
at the front and large inner sprocket wheel at the rear simultaneously. Otherwise the bike
chain could jump off.
Never pedal backwards when changing gears as you could damage the gear-shift mecha-
nism.
Only make changes to the gear-shift system carefully and in small increments. If settings
are made incorrectly, the bike chain could jump off the sprocket wheel and cause you to
fall o’ the bike. If you are unsure about what to do, have this work carried out by a profes-
sional bike workshop.
NOTE: Even if the gear system is perfectly adjusted, rt can produce noise if the chain is running
at an extremely sharp angle. This does not mean it is defective and does not damage
the drive. As soon as the chain is at a more shallow angle, the noise will disappear.