Bulls 21-10-1005 User manual

IMPORTANT
READ CAREFULLY BEFORE USE
KEEP SAFE TO CONSULT AT A LATER DATE
MY21B03 - 32_1.0_23.12.2020
Bicycle Operating Instructions

MY21B03 - 32_1.0_23.12.2020 1
Contents
Contents
1 About these instructions 5
1.1 Manufacturer 5
1.2 Language 5
1.3 Laws, standards and directives 5
1.4 For your information 5
1.4.1 Warnings 5
1.4.2 Markups 6
1.5 Model plate 7
1.6 Identifying instructions 7
2 Safety 8
2.1 Residual risks 8
2.1.1 Fire hazard 8
2.1.1.1 Overheated brakes 8
2.1.2 Risk of a crash 8
2.1.2.1 Incorrect quick release setting 8
2.1.2.2 Incorrect tightening torque 8
2.1.3 Risk of amputation 8
2.2 Toxic substances 8
2.2.1 Brake fluid 8
2.2.2 Suspension oil 8
2.3 Requirements for the rider 8
2.4 Vulnerable groups 8
2.5 Personal protective equipment 8
2.6 Safety markings and safety instructions 9
2.7 What to do in an emergency 9
2.7.1 Dangerous situation in road traffic 9
2.7.2 Leaked brake fluid 9
2.7.3 Oil and lubricant leaks from the fork 9
2.7.4 Oil and lubricant leaks from the rear
frame damper 9
3Overview 10
3.1 Description 11
3.1.1 Wheel 11
3.1.1.1 Valve 11
3.1.2 Suspension 11
3.1.2.1 Rigid fork 11
3.1.2.2 Suspension fork 11
3.1.2.3 Rear frame damper 14
3.1.2.4 Suntour rear frame damper 15
3.1.2.5 RockShox rear frame damper 15
3.1.3 Brake system 16
3.1.3.1 Rim brake 16
3.1.3.2 Disc brake 16
3.1.3.3 Back-pedal brake 17
3.1.4 Drive system 17
3.2 Proper use 18
3.3 Improper use 19
3.4 Technical data 20
3.4.1 Bicycle 20
3.4.2 Tightening torque 20
3.5 Description of controls and screens 20
3.5.1 Handlebars 20
3.6 Environmental requirements 21
4 Transporting and storing 23
4.1 Shipment 23
4.2 Transportation 23
4.2.1 Using the brake transport securing
system 23
4.3 Storing 23
5 Assembly 24
5.1 Required tools 24
5.2 Unpacking 24
5.2.1 Scope of delivery 24
5.3 Commissioning 24
5.3.1 Installing the wheel in the Suntour fork 25
5.3.1.1 Screw-on axle (15 mm) 25
5.3.1.2 Screw-on axle (20 mm) 25
5.3.1.3 Quick release axle 26
5.3.1.4 Quick release 27
5.3.2 Installing the wheel in the FOX fork 28
5.3.2.1 Quick release (15 mm) 28
5.3.2.2 Kabolt axle 29
5.3.3 Checking the stem and handlebars 29
5.3.3.1 Checking the connections 29
5.3.3.2 Firm hold 30
5.3.3.3 Checking the headset backlash 30
5.4 Selling the bicycle 30
6 Operation 31
6.1 Risks and hazards 31
6.2 Personal protective equipment 32
6.3 Instruction and customer service 33
6.4 Adjusting the bicycle 33
6.4.1 Adjusting the saddle 33
6.4.1.1 Adjusting the saddle tilt 33
6.4.1.2 Determining the seat height 33
6.4.1.3 Adjusting the seat height with quick
release 34
6.4.1.4 Adjusting the seat position 34
6.4.2 Adjusting the handlebars 35
6.4.3 Adjusting the stem 35
6.4.3.1 Adjusting the height of the handlebars 35
6.4.3.2 Adjusting the quick release clamping
force 35
6.4.4 Adjusting the brake 35
6.4.5 Retracting the brake linings 36
6.4.5.1 Setting the grip distance on a
Magura HS33 brake lever 36
6.4.5.2 Setting the grip distance on a
Magura HS22 brake lever 36

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Contents
6.4.5.3 Setting the grip distance on a
Magura disc brake lever 37
6.4.5.4 Setting the pressure point on a
Magura brake lever 37
6.4.6 Adjusting the damping sag 38
6.4.6.1 Adjusting the Suntour fork steel
suspension 39
6.4.6.2 Adjusting the Suntour fork air
suspension 39
6.4.6.3 Adjusting the Suntour rear frame
damper 40
6.4.6.4 Adjusting the RockShox fork steel
suspension 41
6.4.6.5 Adjusting the RockShox air
suspension 41
6.4.6.6 Adjusting the RockShox rear frame
damper 42
6.4.7 Adjusting the rebound damping 44
6.4.7.1 Adjusting the Suntour air suspension
fork 45
6.4.7.2 Adjusting the Suntour rear frame
damper 45
6.4.7.3 Adjusting the RockShox suspension
fork 46
6.4.7.4 Adjusting the RockShox rear frame
damper 46
6.4.8 Rear frame damper compression
adjuster 47
6.4.8.1 Adjusting the Suntour rear frame
damper 48
6.4.8.2 Adjusting the RockShox compression
adjuster 48
6.5 Accessories 49
6.5.1 Child seat 49
6.5.2 Trailer 50
6.5.2.1 Trailer approval for ENVIOLO hub gear 50
6.5.3 Pannier rack 51
6.5.4 Suspension fork coil spring 51
6.5.5 Tubeless and airless 51
6.6 Before each ride 52
6.7 Raising the kickstand 53
6.8 Using the pannier rack 53
6.9 Using the saddle 53
6.10 Brake 54
6.10.1 Using the brake lever 54
6.10.2 Using the back-pedal brake 54
6.11 Suspension and damping 55
6.11.1 Suspension fork compression adjuster 55
6.11.1.1 Adjusting the Suntour compression
adjuster 56
6.11.1.2 Adjusting the RockShox compression
adjuster 57
6.11.1.3 Adjusting the RockShox rear frame
damper threshold 57
6.12 Gear shift 58
6.12.1 Using the derailleur gears 58
6.12.2 Using a hub gear 58
6.13 Parking the bicycle 60
7 Cleaning and servicing 61
7.1 Cleaning after each ride 62
7.1.1 Cleaning the suspension fork 62
7.1.2 Cleaning the rear frame damper 62
7.1.3 Cleaning the pedals 62
7.2 Basic cleaning 62
7.2.1 Cleaning the frame 62
7.2.2 Cleaning the stem 62
7.2.3 Cleaning the wheel 62
7.2.4 Cleaning the drive elements 63
7.2.5 Cleaning the rear frame damper 63
7.2.6 Cleaning the chain 63
7.2.7 Cleaning the brake 63
7.2.8 Cleaning the saddle 63
7.3 Servicing 64
7.3.1 Servicing the frame 64
7.3.2 Servicing the stem 64
7.3.3 Servicing the fork 64
7.3.4 Servicing the drive elements 64
7.3.5 Servicing the pedals 64
7.3.6 Servicing the chain 64
7.4 Maintenance 64
7.4.1 Wheel 64
7.4.1.1 Checking the tyres 64
7.4.1.2 Checking the rims 64
7.4.1.3 Checking and adjusting the tyre
pressure 65
7.4.2 Brake system 66
7.4.3 Checking the brake linings for wear 66
7.4.4 Checking the pressure point 66
7.4.5 Checking the brake discs for wear 66
7.4.6 Checking the electrical cables and
brake cables 66
7.4.7 Checking the gear shift 66
7.4.8 Checking the stem 66
7.4.9 Checking the belt and chain tension 67
8 Maintenance 68
8.1 Suspension system 69
8.1.1 Rear frame damper 69
8.1.2 Suspension fork 70
8.1.3 Suspension seat post 71
8.2 Axle with quick release 71
8.2.1 Checking the quick release 72
8.3 Maintaining the stem 72
8.4 Adjusting the gear shift 72
8.4.1 Cable-operated gear shift,
single-cable 72
8.4.2 Cable-operated gear shift, dual-cable 73
8.4.3 Cable-operated twist grip, dual-cable 73

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Contents
9 Troubleshooting, fault clearance
and repair 74
9.1 Lighting 74
9.2 Gear shift 74
9.3 Suspension fork 75
9.3.1 Rebound too fast 75
9.3.2 Rebounding too slowly 76
9.3.3 Suspension too soft on inclines 77
9.3.4 Excessively hard damping on bumps 78
9.4 Rear frame damper 79
9.4.1 Rebound too fast 79
9.4.2 Rebounding too slowly 80
9.4.3 Suspension too soft on inclines 81
9.4.4 Excessively hard damping on bumps 82
9.5 Repair 83
9.5.1 Original parts and lubricants 83
9.5.2 Replacing the lighting 83
9.5.3 Adjusting the headlight 83
9.5.4 Tyre clearance check 83
10 Recycling and disposal 84
11 Documents 85
11.1 Assembly report 85
11.2 Maintenance instructions 87
12 Glossary 89
13 Keyword index 92

MY21B03 - 32_1.0_23.12.2020 4
About these operating instructions
Thank you for your trust!
ZEG bicycles are premium quality bicycles. You
have made an excellent choice. Your specialist
dealer will provide you with guidance and
instruction and assemble your product. Your
specialist dealer will also be happy to assist you in
the future, whether you require maintenance,
conversion or repair.
You are receiving these instructions with your new
bicycle. Please take time to become familiar with
your new bicycle. Use the tips and suggestions in
the instructions. They will help you to enjoy your
bicycle for a long time to come. We hope you have
fun and wish you well on all of your rides!
The instructions are mainly designed for the rider
and the operator. They aim to ensure that non-
professionals can use the bicycle safely.
Download the operating
instructions onto your
phone at the following link,
so that you can use them
when you are out riding:
https://manuals.zeg.com.
Copyright
© ZEG Zweirad-Einkaufs-Genossenschaft eG
Distribution or reproduction of these operating
instructions and utilisation or communication of
their content is prohibited unless expressly
approved. Any infringement will render the
offender liable for compensation. All rights
reserved in the event that a patent, utility model or
industrial design is registered.
Editing
Text and images:
ZEG Zweirad-Einkaufs-Genossenschaft eG
Longericher Strasse 2
50739 Köln, Germany
Translation
RKT Übersetzungs- und Dokumentations-GmbH
Markenstrasse 7
40227 Düsseldorf, Germany
If you have any questions or problems
regarding these instructions, please contact:
[email protected]
Notice
These instructions are not a substitute for
personal instruction by the supplying specialist
dealer.
These instructions form an integral part of the
bicycle. Therefore, if it is re-sold at a later time,
they must be handed over to the subsequent
owner.
Sections are also designed especially for the
specialist dealer. These sections aim to ensure
that specialist dealers complete initial assembly
and maintenance safely and reliably. The
sections for specialist dealers are highlighted in
grey and marked with a spanner symbol.

MY21B03 - 32_1.0_23.12.2020 5
About these operating instructions
1 About these instructions
1.1 Manufacturer
The manufacturer of the bicycle is:
ZEG Zweirad-Einkaufs-Genossenschaft eG
Longericher Strasse 2
50739 Köln, Germany
Tel.: [phone]
Fax: [phone]
E-mail: [email protected]
Subject to internal changes.
The information contained in these instructions
are the approved technical specifications at the
time of printing. Any significant changes are
included in a new published version of the
instructions. You will find any modifications to
these instructions at:
https://manuals.zeg.com.
1.2 Language
The original instructions are written in German. A
translation is invalid without the original
instructions.
1.3 Laws, standards and directives
The instructions comply with the main
requirements specified in:
• ISO 4210-1: 2015-01 – Cycles – Safety
requirements for bicycles
• EN 11243:2016, Cycles – Pannier racks for
bicycles – Requirements and test methods
• IEC/IEEE 82079-1:2019-05 – International
Standard for Preparation of information for use
(instructions for use) of products
• ISO 17100:2016-05 Translation Services –
Requirements for translation services.
1.4 For your information
Different markings are used in the instructions to
make them easier to read.
1.4.1 Warnings
Warnings indicate hazardous situations and
actions. You will find warnings in the instructions:
Will lead to serious or even fatal injuries if
ignored. High-risk hazard.
May lead to serious or even fatal injuries if
ignored. Medium-risk hazard.
May lead to minor or moderate injuries if ignored.
Low-risk hazard.
Notice
May lead to material damage if ignored.
DANGER
!
WARNING
!
CAUTION
!

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About these operating instructions
1.4.2 Markups
You will find stylised forms of typeface in the
instructions:
Instructions for specialist dealers are highlighted
in grey. They are indicated by a screwdriver
symbol. Information for specialist dealers does
not require non-professionals to take any action.
Stylised form Use
Italics Glossary term
Underlined in blue Link
Underlined in grey Cross references
Check marks Requirements
Triangle Instruction for action with
a specific sequence
1Instruction for
action
Several instructions for
action in specified order
Result of the action
SPACED Indicators on the display
screen
• Bulleted lists
Only applies to bicycles
with this equipment Each type has a different
kind of equipment. A
note beneath the
heading indicates
components which can
be used as an
alternative.
Table 1: Markups

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About these operating instructions
1.5 Model plate
The model plate is situated on the frame. You can
see the exact position of the model plate in Figure 2.
There are seven pieces of information on the
model plate.
Figure 1: Example Nameplate
1.6 Identifying instructions
The Identification number position is located on
bottom left-hand side on each page. The
identification number is composed of the
document number, the version number and the
release date.
No. Designation Description
1 Manufacturer's contact details You can contact the manufacturer at the address. You can find more information in
Section 1.
2 Type number All bicycle models have an eight-digit type number, which is used to specify the design
model year, the type of bicycle and the version. You can find more information in
Section 1.
3 Bicycle type You can find more information in Section 3.2.
4 Safety markings You can find more information in Section 1.4.
5 Safety markings You can find more information in Section 1.4.
6 Area of use You can find more information in Section 3.2.
7 Maximum total weight The maximum total weight is the maximum weight of the fully assembled bicycle with the
rider and baggage.
Table 2: Model plate information
ZEG Zweirad-Einkaufs-
Genossenschaft eG
Longericher Str. 2
50739 Köln, Germany
Typ:
21-10-1005
ISO 4210-2
125 kg
1
3
4
7
6
5
2
Identification number MY21B03 - 32_1.0_23.12.2020

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Safety
2 Safety
2.1 Residual risks
2.1.1 Fire hazard
2.1.1.1 Overheated brakes
The brakes may become very hot during
operation. There is a risk of burns or fire in case
of contact.
Never touch the brakes or the motor directly
after a ride.
Never place the bicycle on a flammable
surface, such as grass or wood, directly after
use.
2.1.2 Risk of a crash
2.1.2.1 Incorrect quick release setting
Excessively high clamping force will damage the
quick release and cause it to lose its function.
Insufficient clamping force will result in
unfavourable transmission of force. This can
cause components to break. This will cause a
crash with injuries.
Never fasten a quick release using a tool (e.g.
hammer or pliers).
Only use the clamping lever with the specified
set clamping force.
2.1.2.2 Incorrect tightening torque
If a screw is fastened too tightly, it may break. If a
screw is not fastened enough, it may loosen. This
will cause a crash with injuries.
Always observe the indicated torque on the
screw or in the instructions.
2.1.3 Risk of amputation
The brake disc in disc brakes is so sharp that it
can cause serious injuries to fingers if they are
inserted into the brake disc openings.
Always keep fingers well away from the
rotating brake discs.
2.2 Toxic substances
2.2.1 Brake fluid
Brake fluid may leak out after an accident or due
to material fatigue. Brake fluid can be fatal if
swallowed or inhaled.
Never dismantle the brake system.
Avoid contact with skin.
Do not inhale vapours.
2.2.2 Suspension oil
Suspension oil in the fork and the rear frame
damper is toxic to the touch, irritates respiratory
tracts and causes cancer, sterility and mutation in
germ cells.
Never dismantle the rear frame damper or the
suspension fork.
Avoid contact with skin.
2.3 Requirements for the rider
The rider must demonstrate adequate physical,
motor and mental abilities to ride on public roads.
2.4 Vulnerable groups
If minors use the bicycle, a legal guardian must
give children comprehensive instruction on its
use.
2.5 Personal protective equipment
Wear a suitable cycling helmet, sturdy footwear
and typical close-fitting clothing to provide
protection.

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Safety
2.6 Safety markings and safety
instructions
The bicycle nameplate contains these safety
markings and safety instructions:
2.7 What to do in an emergency
2.7.1 Dangerous situation in road traffic
In the event of any hazards or dangers in road
traffic, apply the brakes on the bicycle until it
comes to a halt.
2.7.2 Leaked brake fluid
The brake system must be repaired immediately if
brake fluid leaks out. Dispose of leaking brake
fluid in an environmentally responsible way in
accordance with statutory regulations.
Remove those affected from the danger area to
fresh air.
Never leave those affected unattended.
Immediately remove any clothing items
contaminated with brake fluid.
Never inhale vapours. Ensure sufficient
ventilation.
Wear gloves and safety gloves as protective
equipment.
Keep unprotected persons away.
Take care with leaked brake fluid as it poses a
slip hazard.
Keep leaked brake fluid away from naked
flames, hot surfaces and sources of ignition.
Avoid contact with skin and eyes.
After inhalation
Take in fresh air. Immediately consult a doctor
in case of any discomfort.
After skin contact
Wash affected skin with soap and water and
rinse well. Remove contaminated clothing.
Consult doctor in the event of pain or
discomfort.
After contact with eyes
Rinse eyes under flowing water for at least ten
minutes with the lids open; also rinse under
lids. Immediately consult a doctor in case of
any pain or discomfort.
After swallowing
Rinse out mouth with water. Never induce
vomiting. Risk of aspiration!
If a person is lying on their back and vomiting,
place them in the recovery position. Seek
medical advice immediately.
Environmental protection measures
Never allow brake fluid to flow into the sewage
system, water courses or groundwater.
Notify the relevant authorities if fluid
penetrates the ground, water courses or the
sewage system.
Consult a doctor immediately in the event of any
pain or discomfort caused by combustion gas or
leaking fluids.
2.7.3 Oil and lubricant leaks from the fork
Dispose of oils and lubricants which have leaked
from the rear frame damper in an environmentally
responsible way in compliance with statutory
regulations.
Contact your specialist dealer.
2.7.4 Oil and lubricant leaks from the rear
frame damper
Dispose of oils and lubricants which have leaked
from the rear frame damper in an environmentally
responsible way in accordance with statutory
regulations.
Contact your specialist dealer.
Symbol Explanation
General warning
Adhere to the instructions for use
Table 3: Meaning of safety markings
Symbol Explanation
Read the instructions
Recyclable material
Table 4: Safety instructions