MASTIFF CARGO BIKE User manual

USER MANUAL
Issued on: 2022.

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Table of contents
INTRODUCTION..................................................................................................3
GENERAL WARNINGS .......................................................................................4
I. PRIMARY INFORMATION ................................................................................6
I.1 Appropriate cargo bike size ..........................................................................6
I.2 Safety first.....................................................................................................6
I.3 Technical security inspection........................................................................6
I.3.1 Screws, nuts and other fasteners ...........................................................7
I.3.2 Wheels and tyres....................................................................................7
I.3.3 Brakes ....................................................................................................8
I.3.4 Wheel fastening system..........................................................................8
I.3.5 Saddle bar ..............................................................................................8
I.3.6 Handlebar stem and saddle position.......................................................8
I.3.7 Handlebar tube ends ..............................................................................8
I.4 First use........................................................................................................9
II. SAFETY..........................................................................................................10
II.1 The basics ……………………………………………………………………….10
II.2 Safety ....................................................................................................... 11
II.3 Riding the cargo bike in wet weather......................................................... 12
II.4 Riding the cargo bike at night ....................................................................13
II.5 Replacement of parts and installation of accessories................................ 14
III. DIMENSIONS.................................................................................................16
III.1 Saddle position..........................................................................................16
III.2 Handlebar height and angle...................................................................... 18
III.3 Adjusting the position of controls...............................................................19
IV. TECHNICAL INFORMATION.........................................................................20
IV.1 Wheels …………………………………………………………………………..20
IV.1.1 Installation and removal of wheels......................................................21
IV.2 Brakes.......................................................................................................23
IV.2.1 Brake handling and their properties....................................................23
IV.2.2 How the brakes work ..........................................................................23
IV.3 Shifting gears............................................................................................24
IV.3.1 How the derailleur works.....................................................................24
IV.3.2 How the internal hub gear (IHG) works...............................................26
IV.4 Tyres and inner tubes............................................................................... 28
IV.4.1 Tyres................................................................................................... 28
IV.5 Valves ………………………………………………………………………….29

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IV.6 Electric assistance (display, sensor, motor)...............................................29
IV.6.1 Factors affecting range........................................................................30
IV.6.2 Safety requirements.............................................................................30
IV.6.3 Charging the battery............................................................................31
IV.6.4 Technical specifications.......................................................................32
IV.6.5 Display control buttons (DS20) ............................................................33
IV.6.6 On/Off..................................................................................................33
IV.6.7 Assistance levels.................................................................................33
IV.6.8 Meaning of ODO, AVG, MAX, CAD, TRIP information displayed on
screen..................................................................................................34
IV.6.9 Walk mode...........................................................................................34
IV.6.10 Switching lights on/off ........................................................................34
IV.6.11 Settings..............................................................................................34
V. REPAIR AND MAINTENANCE........................................................................35
V.1 Service ……………………………………………………………………………36
V.1.1 Run-in period........................................................................................36
V.1.2 Before each use ...................................................................................36
V.1.3 After long or heavy use.........................................................................36
V.1.4 After every long ride or heavy use, or after every 10 or 20 hours of riding
the cargo bike……………………………………………………………………..36
V.1.5 If necessary..........................................................................................38
V.1.6 For every 25 hours of cycling (off-road terrain) or 50 hours of cycling
(on road) …………………………………………………………………………. 38
V.1.7 If the cargo bike is exposed to a bump or collision ...............................38
A) ANNEX: PROPER USE OF THE CARGO BIKE .............................................39
B) ANNEX: TIGHTENING TORQUES .................................................................46
C) ANNEX: INSTRUCTIONS ON THE PUTTING INTO OPERATION AND
MAINTENANCE OF ELECTRIC CARGO BIKES …………………………............48

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INTRODUCTION
Thank you for purchasing a MASTIFF Cargo Bike! On the following pages you will
find detailed information on the use, setting, maintenance and repair of your bike.
IMPORTANT!
The user manual contains important safety, performance and maintenance
information. Read it carefully before using your cargo bike and keep it for future
reference! You can find more safety and maintenance information on specific
parts, such as the fork, pedals or accessories (helmet, headlights). Make sure that
the person from whom you bought the cargo bike has provided you with all the
instructions that came with it and its accessories.
Please follow the safety tips described here, as they will help you avoid serious
accidents and injuries.
If, after reading this manual, you have any questions about your cargo bike that
are not answered, please contact the dealer from whom you purchased your cargo
bike or, if you ordered directly from us, the nearest authorised dealer. You can find
a list of our reseller partners on our website:
https://www.mastiffcargobike.com/uzletek/. Our reseller partners will help answer
your questions, perform the necessary maintenance and warranty repairs, and
provide you with the best possible parts and accessories.
NOTE:
This manual is not intended for detailed use, maintenance or repair
purposes. Contact our reseller partners for all maintenance or repair
operations. Information on maintenance and repair manuals and training
courses is also available from our reseller partners.

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GENERAL WARNINGS
Like all sports, cycling can be associated with the risk of injury. If you decide to
ride a cargo bike, you are taking risks, so you should be aware of the basic rules
for safe and responsible cycling and the proper use and maintenance of your cargo
bike, as this will significantly reduce the risks.
In this manual, the section beginning with the words "WARNING" and "CAUTION"
draw your attention to the consequences of improper maintenance and failure to
observe the safety regulations.
The word WARNING indicates a potentially hazardous situation which could result
in serious injury or death. If such a situation is not avoided, it can lead to serious
damage to the cargo bike or loss of warranty.
The word CAUTION indicates a potentially hazardous situation which, if not
avoided, could result in minor or moderate injury and warns of unsafe use.
The manual contains several sections of WARNING and CAUTION warning you
that you could lose control of the cargo bike and fall. Since every fall can result in
serious injury or even death, we do not always draw attention to the consequences
of a fall.
As it would be impossible to summarise all situations and conditions that may
occur when riding a cargo bike, this user manual does not include safety
information for all situations. Cycling, like all sports activities, involves risks that
cannot be foreseen or avoided and for which the user alone can be held
responsible.
Special warnings for parents
The use of cargo bikes is generally recommended for adults. If your child is going
to use it, it is important that he or she has a good knowledge of cargo cycling, is
over 14 years old and is 155 cm tall.
As a parent or guardian, it is your responsibility to judge whether your child can
use a cargo bike and, if you decide to do so, you take responsibility for your child's
safety. As a parent, it is your responsibility to read this user manual and to discuss
the warnings and information about the use and functions of the cargo bike with
your child before your child uses the cargo bike.

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WARNING! Make sure that your child always wears a suitable cycling helmet,
headgear (hereafter: helmet) when cycling; but also make sure that your
child understands that a helmet is for cycling only and must be taken off
after cycling. Your child should not wear the helmet when playing, in
playgrounds, when climbing trees or at any time other than when riding a
bicycle. Failure to comply with this warning may result in serious injury or
death.

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I. FIRST THINGS TO KNOW
NOTE: We strongly recommend that you read this manual in its entirety
before using your cargo bike. If, after reading this manual, you have any
further questions about the use of your cargo bike, you should first contact
our reseller partner and then, if necessary, contact us, the manufacturer.
I.1 Appropriate cargo bike size
➢Is your cargo bike the right size? If the cargo bike is too big or too small for
you, you could lose control and fall off. To select the correct saddle height
and adjust the saddle height, see section III.1 Saddle position. When
adjusting the saddle height, follow the instructions for setting the maximum
height described in section III.1 Saddle position.
➢Can you fasten the front and rear wheels securely? For more information,
please, read section IV.1.1 Installing and removing wheels. Improperly
secured wheels can loosen, which can lead to serious injury or death.
I.2 Safety first
➢Always wear appropriate headprotection when riding acargo bike and follow
the manufacturer's instructions for helmet size, use and maintenance.
➢Do you have the necessary protective equipment? Read more about in
section II. Safety. It is your responsibility to learn and comply with the laws in
your country.
I.3 Technical safety inspection
Check the condition of the cargo bike before each use!
I.3.1 Screws, nuts and other fasteners
Since manufacturers use a wide range of fasteners of different sizes and
characteristics, it is not possible to determine the correct clamping torque in
general. Read Annex B) of this manual or refer to the relevant component's
manual for the appropriate clamping torque values to use.
A calibrated torque wrench is needed to correctly tighten each fastening element.
Please have this operation performed by a professional! If you want to carry out

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repair or maintenance work yourself, use a torque wrench and observe the torque
values specified by the manufacturer of the cargo bike or component. If you need
to tighten the fasteners at home or during use, please be vigilant and check the
tightening of the fasteners as soon as possible with our reseller partner.
CAUTION! Tightening the cargo bike's fasteners (bolts, nuts) to the correct
torque is a priority. When tightening at too low a torque, the fastener will not
hold the part securely. Excessive torque can cause failure, breakage or
deformation of the fastener. In either case, insufficient torque can lead to
failure and cause an accident.
Make sure that none of the parts are loose. Raise the front wheel 5 to 10
centimetres off the ground, then lower it back down and let it bounce, so you can
spot any loose parts. Inspect the cargo bike by moving the different parts. If you
experience any loose fastening, tighten it. If you are unsure, contact a professional
for help.
I.3.2 Wheels and tyres
Make sure your tyres are properly inflated. Check by placing one hand on the
saddle and the other on the handlebar and stem connection, then put your full
body weight on the bike, while watching the tyres. Do the same for properly inflated
tyres and compare the results. Inflate the tyres if necessary.
➢Are the tyres in good condition? Turn the wheels slowly and check that the
tyres are in good condition by looking for small cuts on the sidewall of the
tyres.
➢Are the wheels properly centred? Turn the wheels and check the distance
between the brake shoes and the brake disc, and check for any movement
sideways. If the wheel moves sideways even the slightest bit, or if the brake
disc comes into contact with the brake shoes, take the cargo bike to a
specialist workshop and have the wheel centred.
➢Are the rims clean and undamaged? Make sure that the rims are clean and
in good condition, and that the rim edges are in good condition.
I.3.3 Brakes
Check that the brakes are working properly (see section IV.2 Brakes). Tighten the
brake levers. Are all cables properly routed and connected? Do the brakes start
to apply when the brake lever is moved 2.5 cm? Can you apply the full braking
force without the brake levers touching the handlebars? If not, the brakes need
adjusting. Do not use the cargo bike until the brakes have been professionally
adjusted.

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I.3.4 Wheel fastening system
Make sure that the front and rear wheels of the cargo bike are properly secured.
Read more about this in section IV.1 Wheels.
I.3.5 Saddle bar
Check that the saddle height is correctly adjusted and securely fastened.
I.3.6 Handlebar stem and saddle position
Make sure that the handlebars and saddle are parallel to the centre line of the
cargo bike and properly secured, so that you cannot move them out of their set
position.
I.3.7 Handlebar tube ends
Make sure that the handlebar grips are properly secured and in good condition.
Otherwise, have them replaced by our reseller partner.
Make sure that the end caps on the handlebar tube are in place. Otherwise please
contact our reseller partner.
WARNING! Loose or damaged handlebar grips can lead to loss of control and a
fall. A handlebar tube without a cap can cause a cut or serious injury in an
otherwise minor accident.
EXTREMELY IMPORTANT SAFETY INFORMATION:
Be sure to read Annex A and note the information on the service life of the
cargo bike and its parts.
I.4 First use
When you first get on a cargo bike, choose a familiar, safe environment, away
from traffic, other cyclists, obstacles and hazards. Get to know the handling,
features and performance of your new bike.
Try the vehicle and familiarise yourself with the brakes on your cargo bike (see
section IV.2 Brakes). Test the brakes at low speed, put your weight on the back of
the bike and apply the levers lightly (rear brakes first).
Sudden or heavy application of the front brake may cause you to fall over the
handlebar.
Applying the brakes too hard can lock the wheel, causing you to lose control and
fall off. Locking of the wheels can also lead to skidding or sliding.

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Practise changing gears (see section IV.3 Changing gears). Remember never to
change gears while pedalling backwards, and never pedal immediately after
changing gears. This can cause the chain to get stuck and result in a serious
failure.
Test the handling and behaviour of the cargo bike; check the comfort features.
If you have any questions or if you feel that something is wrong with your cargo
bike, please contact our reseller partner before you use it again.