The FAQ includes topics that are either included in the Stromer FAQ do not occur or require a supplement.
There are more on the YouTube channel Stromerbike' Various videos about Stromer in general, but also How to Videos on various topics.
3D printer accessories...
Mudguard extensions, battery bases, SP-Connect bases, etc. See here.
Modifications to the Stromer - homologation/conformity or type approval (CoC)...
Stromer bikes are speed pedelecs, i.e. fast "e-bikes" up to 45 km/h, which belong to vehicle class L1e-B (USA: Class 3) or two-wheeled mopeds.
For road approval, the Stromer must have an operating permit, type approval, the so-called CoC (Certificate of Conformity), or in Switzerland a type approval. It is issued by the respective authority (DE= Kraftfahrt-Bundensamt, KBA | CH= Motorfahrzeugkontrolle, MFK). It confirms that the vehicle meets the legal requirements when it is first registered and also means that parts may not be modified or conversions made unless they undergo the type approval procedure again (expert opinion in DE= TÜV, Dekra | CH= Motorfahrzeugkontrolle, MFK).
Worn parts must be replaced with identical, equivalent parts. The CoC contains the dimensions of the rim and the tires but no explicit information on the manufacturer. The approved tires are also specified in the respective Operating instructions to be taken from the website. On the website in the Warranty provisions and limitations of liability all legally relevant information is noted.
If, for example, the frame is not repainted properly, the 10-year warranty claim expires. If improper modifications are made or parts are installed that are not approved, the 24-month Stromer warranty expires.
> See List of type certificates Switzerland > See as an example the CoC of the ST3 / ST5
ABS - Which profile of the Blubrake ABS does Stromer use?
Stromer grants a capacity guarantee of two years on the batteries. If a battery reaches the SoH threshold (SoH = State of Health) of 75 % within two years, the battery will be replaced under warranty.
On average, mileages of 20,000 - 25,000 km in two years are required to reach the 75% SoH of the battery. According to an article in the NL Forum From June 2024, fewer than 25 batteries per year across Europe will reach the threshold based on this performance and be replaced.
In principle, all batteries of the respective design can be exchanged with each other - i.e. the 8-sided batteries of the BO series or the square batteries of the BQ series can be exchanged with each other. The ST7 battery currently stands alone. The BO/BQ series batteries cannot be used in the ST7.
Battery - Cannot be "ejected" as the Stromer does not start
See AKKU - 'Battery cannot be ejected because the Stromer does not start'
Battery - Limit charging capacity (SoC) when charging?
See AKKU - 'Fast charging? ...a calculation example'
Battery - Which one do I need?
Sometimes the question arises as to which battery size or capacity to buy. I always recommend the largest, the BQ983. I have explained why this is the case in the chapter 'Increase reach' described.
Controller (MCU) defective! Can I have this repaired?
Like many components of a Stromer, the controller (MCU = Motor Control Unit) is a specific Stromer component. Stomer has two models in use: an IPS controller (Information Processing Standard) from ASI (Accelerated Systems Inc.) with preset values and a programmable controller from EDS (Eloquent Design Services), which can be individually customized.
Controller faults are quite common and usually paralyze the Stromer. Sometimes there are only partial failures. One of these is, for example, that the battery in the Stromer can no longer be charged, but the Stromer otherwise works.
ASI controller with defective MOSFETs
ASI Controller ST5 after almost 50,000 km
ASI controller with defective charging section
To date, there is no known repair service that repairs controllers, and Stromer does not do this either. One reason will be that the ASI controllers are all encapsulated from around 2018 onwards, making repairs virtually impossible. In the event of a defect, you have to buy a new one.
See also: ELECTRICS / ELECTRONICS - MEASUREMENTS - 'Testing MOSFETs'
Turn signals - Can the Stromer do that?
Stromer never came with indicators. Models with an ESD MD3 controller, as shown here with an ST3 Pinion, have a correspondingly prepared cable: HG & Ind = Heated Grip (heated handle) / Indicator (blinker) which may indicate a future possibility.
ST3-Pinion wiring harness > EDS-MCS Controller
However, there are various Stromer drivers who have had indicators retrofitted by various suppliers.
The XTR SC-M9051 display unit was installed in the ST2s for the Di2 circuit. This contains a charge level indicator in the form of a battery symbol for the Di2 battery. On the ST5, the display was replaced by the EW-RS910 junction box. In the early models, this was installed at the very bottom of the seat tube at the level of the bottom bracket. It was later moved to the right-hand end of the handlebars.
The EW-RS910 does not have a classic charge level indicator. By pressing and holding the shift lever for at least 0.5 seconds, the left LED lights up and indicates the charge status as shown in the illustration below. The current switching mode is then displayed. To the Instructions from Shimano.
Shimano junction box EW-RS910
The USB port by the daytime running light can be used to charge the Di2 battery (ST2S & ST5).
Bluetooth - pairing does not work - what to do?
See PROBLEMS - SMARTLOCK, EHEMLAS SEAMLESS RIDE - 'Bluetooth or the pairing does not work'
Di2 Shimano battery - How long does it last / charging
Depending on the route profile, a few 1,000 gear changes can be made.
I have charged my Di2 battery 6 times over a distance of 28,200 km. That results in a Average range between the individual charging points of 4'713 km. I mostly drive rural routes. In an urban environment with more gear changes, it will be a little less.
If the battery is very low, the charge indicator flashes on the XTR SC-M9051 (ST2S) display.
The USB port by the daytime running light can be used to charge the Di2 battery (ST2S & ST5).
Bluetooth - Smart Helmet & Smartlock - Why neither works
In the summer of 2022, Stromer took its first Smart Helmet to the range of accessories. The helmet is manufactured by Unit 1 and is called Faro.
The helmet can be connected to the Stromer via Bluetooth. This enables the brake light in the helmet to be synchronized with the Stromer brake levers (from Omni FW 4.4.0.8 / 17.11.2022). > Practice video
The Faro's flashing function only works with the separate Faro remote control, but also works when the helmet is paired with the Stromer. See also the video here (EN).
> Further information is also available at stromerforum.ch in this thread.
Anyone buying a Faro must know that the Stromer Smartlock and the helmet cannot be used at the same time.
Update: At the Eurobike in June 2023 in Frankfurt, the model 'Stromer Smart Helmet AURA by Unit 1' presented. In future, it will also offer the flashing function in conjunction with the Stromer. Support for the AURA in the Omni was added with FW update 4.4.3.5 in April 2024. Turn signal support has not yet been implemented (as of July 2025).
Di2 Shimano battery - Where is it mounted?
The Shimano Di2 battery for the Shimano XTR Di2 11 Speed 11-42 drivetrain is mounted in the top tube of the ST2S / ST5 / ST7, underneath the Omni.
BMS - What is it?
The BMS (Battery Management System) is an electronic system that manages the battery. It monitors the status and can, for example, calculate secondary data such as the state of charge (SoC) or the state of health (SoH). It protects the battery by preventing operation outside the safe operating range, communicating with the charger and charging the cells and also balancing them at the end of the CV charging window.
Di2 Shimano rear derailleur - adjustment / reset etc.
See SHIFTING - Shimano (including Di2) - ,Di2 .....
Boost Mode - Where has it gone?
Boost mode until the end of 2017
The Stromer ST1x, ST2 and ST2S models built before 2018 provide full support at the touch of a button: the so-called boost mode accelerates up to 20 km/h without pedaling.
Boost mode from 2018
Since a change in the legal regulations in 2018, boost mode has not disappeared but has been moved from the first operating level to the service menu and is therefore no longer available for quick access.
In the Service menu select the BOOST menu. By pressing and holding the [+] button on the button ring, you can accelerate the Stromer without pedaling. The maximum speed on level ground is between 11 - 18 km/h.
Boost mode should not be confused with the 'MOVE' starting or pushing aid (up to 6 km/h).
Theft protection - hardening with tracker and bike lock
See PIMP mySTROMER - 'Theft protection - hardening with tracker and bike lock'
Brakes - adjust brake lever distance (reach) to handlebars?
See BREMSEN - 'Brake lever: Adjust distance (reach) to the handlebars'
Theft protection - activate (retrospectively)?
The anti-theft protection is activated automatically when your Stromer is switched on and is moved when locked.
At the same time, the motor brake is activated, making it much more difficult to push the Stromer away.
The position of the stolen vehicle is recorded if there is a mobile network connection.
The headlights flash.
You will receive an SMS to the mobile phone number registered during activation or a message by e-mail.
The theft mode continuously consumes power. It is effective as long as the battery is in the bike and has a minimum remaining charge. If the battery is fully charged, it will be empty after around 10 days with anti-theft protection activated.
The theft mode was developed to switch off the Stromer for a short period of time, for example while shopping. It is not suitable for monitoring it over a longer period of time. If the Stromer is parked for longer periods, it should be switched off and locked with a Castle be secured.
The anti-theft protection is not activated if the Stromer is pushed back, moved only over the front wheel, carried away or transported away.
It can be activated manually in the Omni app in two ways:
On the start page of the Omni app, scroll to the map at the bottom and tap on the bicycle symbol. In the new window, tap the bicycle icon again. At the top right you will now see the symbol (2) 'Red hand with lock'. Tap it and activate the theft protection in the following window.
The second option can be found in the 'Configuration' menu. See pictures below.
Question: Can I also activate the theft mode when the battery is not inserted?
Answer: Yes, activate the theft mode in the Omni app in the configuration menu. As soon as a battery is inserted in the stolen Stromer, the position should be visible in the map view.
Brakes - spare parts?
> See BREMSEN - 'Spare parts: Pads, disks, levers etc.‚
Like all bikes, Stromer S-Pedelecs are equipped with various mechanical screw connections. From the seat post to the headset bearing to the mudguard mountings, specific torque specifications apply for fastening them.
The new Operating instructions only contain the torque specifications for elements on which the customer can work himself. Here another version that includes almost all torques. However, the specifications for the rear thru axle are usually missing here too. These and the sensor plate are essential for the Stromer drive to function correctly. If something is wrong here, this is immediately noticeable in the support.
See ELECTRICS / ELECTRONICS - 'Measuring - CAN bus - Brief theory'
Spare parts / repair - What can be repaired on a Stromer?
myStromer AG does not manufacture its S-Pedelecs itself, but has the individual components manufactured by suppliers, usually in a manner specified for Stromer. Spare parts can therefore - with a few exceptions - not be purchased externally on the market. Exceptions are individual wearing parts such as the chain, the belt, the brake pads or parts where there are alternatives, such as the brake disks or the rear-view mirror.
Stromer does not repair any components or parts. Only new components or parts are sold. On the myStromer website in the section retailer/flagship store there are second-hand offers of bikes and sometimes also batteries.
The Table here is an overview of which parts / components can be repaired as DIY or are available as wear or spare parts.
Code table - Display ST1 / V1 / V1.1
See OMNI / DISPLAY V1, V1.1 Display V1 / V1.1 - under 'Display codes'
Spare parts - Where can I get the originals?
Situation
myStromer AG does not sell spare parts.The respective Stromer dealer is responsible for repairs, service and also 'the spare parts warehouse'. Individual dealers sell spare parts 'over the road'.
Stromer dealers can obtain all original spare parts from myStromer AG, provided they are in stock. Stromer also offers the following in the service portal for dealers Fault flow diagrams which help with troubleshooting.On the myStromer website haendler0/flagship-store sometimes bikes and batteries are available at reduced prices under 'second-hand sale'.
Online stores
A well-stocked Online store for Stromer spare parts is carried by the German Stromer dealer stromer-bike.de.
The 'Cruise Control' function introduced with firmware 4.4.3.3. (20.11.2023) supplements the previous recuperation mode as a departure assistant.
The Cruise Control function automatically adjusts the motor resistance (recuperation) in order to maintain the speed that is being ridden downhill at the moment Cruise Control is activated (long press on the minus button on the control ring).
In OMNI > MENU > BIKE > Recup Mod... settings can be made to the recuperation mode. Here you can choose between Cruise Control (standard function) or the previous Recup mode. In Cruise Control mode, you can also set the speed increments (default: 5 km/h) and the pedal force for automatic deactivation of the motor brake.
The 'Cruise Control' and 'Recup' mode cannot be activated if the battery is charged to 100%.
It is not possible to change mode while driving!
It may not be possible to maintain the speed on steep terrain because the maximum recuperation current for the battery is reached.
Driving dynamics cause problems
See TMM-SENSOR - 'Problems with support and possible solutions'
Test routines for parts and components of the Stromer are available in the Omni. For example, the motor, controller, battery, brake function, etc. can be tested. They are accessible via the Service menu reachable.
See ERROR AND WARNING MESSAGES - '* Status, warning and error messages (analyze)'
Rims / hubs / wheel bearings - What does Stromer use?
Stromer uses different manufacturers for rims and hubs.
Older models, such as the ST1 V1, 36 V / ST1x, 6 & 12 V / ST2, 6 & 12 V, are fitted with a Formula DC71 hub with a 100 mm x 15 mm thru axle.
Many models are fitted with rims and hubs from the Taiwanese manufacturer Alex Rims to the application.
High-end models, such as the ST2S or ST5 of the time and today's ST7, feature rims and hubs from DT Swiss. On the first two models, the lettering +STROMER- can be seen on older batches with DT Swiss rims.
On the ST3 Pinion and other models delivered from around mid-2023, in addition to AlexRims, you can now also see rims from Rodi with a hub from Blackjack. Blackjack belongs to the Portuguese company RODI, based in Aveiro. Hubs from Blackjack are compatible with those from AlexRims. (Source)
Bearings for the following hubs are: (without guarantee)
ST1 year 2016 Thru axle: Formula DC71 (100mm x 15mm) Bearing: DT 6903 hub bearing (18mm x 30mm x 7mm)
ST1x / ST2 On the ST1x and ST2, Stromer uses bearings that are permanently installed in the front wheel and cannot be replaced.
ST2 / Year 2016 XERO 18307 LBLU 6903-18 2RS = 18307-2RS | Ø18 x Ø30 x 7 mm alternatively DT Swiss 6903 LBT / DT Swiss 1830
ST2S / ST5 / ST7 DT Swiss 6902 2RS = 15287-2RS | Ø15 x Ø28 x 7 mm
Stromer distributes firmware updates for the electronic components (OMNI-C, controller, batteries and power supply units, ABS) via OTA (Over the Air). The updates are distributed in waves, presumably according to the ABC of customer names. It can take up to two months for a new update listed on the website to arrive on your Stromer.
> See also OMNI / DISPLAY V1, V1.1 - Firmware update
Guarantee
The guarantee is as follows Warranty conditions of myStromer AG for at least the statutory 2 years.
It covers all Stromer-specific components that are available from authorized Stromer dealers. It extends exclusively to Stromer products that are new and subject to a material or production defect. All other parts and components are excluded from this warranty.
Parts replaced under warranty are again covered by the full warranty period.
Warranty exclusion: See point 5 in the regulations.
Supernova lighting
The ST2S / ST5 / ST7 uses front lighting from Supernova, among others. Supernova offers an extended warranty on its models and writes on the Website:
"Our service promise: 5-year guarantee and at least 10 years of repairability for all lighting systems!"
It may therefore be worth contacting Supernova directly in the event of a defect if Stromer's warranty no longer applies.
Pedelec stands for Pedal Electric Cycle. The electric motor only provides assistance when pedaling. When a speed of 25 km/h is reached, the motor switches off. Pedelecs are legally classified as bicycles. However, the term 'e-bike' is usually used instead.
S-pedelecs (speed pedelecs) provide assistance when pedaling up to a speed of 45 km/h. S-pedelecs are classed as mopeds (class L1e-B).
E-bikes (the spelling according to road traffic regulations) are single-seater mopeds with a switchable electric drive. You don't have to pedal to move forward. Bosch eBike Systems uses the term 'e-bike' almost exclusively in the sense of a 'pedelec', i.e. bikes with up to 25 km/h assistance.
Regulations / Laws
The industry association ZIV (Zweirad-Industrie-Verband) has published the first comparative Study (Nov. 2023) on the speed pedelec category in Europe. For the study Mobycona Dutch consultancy firm for sustainable mobility, investigated the regulations and experiences with these vehicles in Germany, Belgium, Denmark, the Netherlands and Switzerland.
Pro Velo Switzerlandhas made a comparison of the regulations (CH / FL / DE / FR / Ö / I). The table can be here can be viewed here (as of Nov. 2020).
You can also register with veloplus.ch including a clear comparison of the regulations for pedelecs and S-pedelecs in Switzerland.
What the laws are like in the border triangle CH / DE / FR blog.primeo-energie.ch here.
> See also PIMP mySTROMER - 'Blinker' > See also here in the FAQ - 'Helmet - Which regulations apply?
Weight - How much does a Stromer weigh?
In the course of fashion evolution, the Stromer became heavier and heavier. Here is a small compilation. It is based on data from information available online, but in practice may vary by +/- 1 kg depending on the frame.
The maximum system weight of the models is 140 kg for the 26″ models and 150 kg for the 27.5″ models. The permissible luggage carrier load is between 18.5 and 22.5 kg.
Handles - Can they be heated?
Stromer was never available with heated grips as standard. Some controllers, such as here an ST3 Pinion, have a correspondingly prepared cable (HG & Ind = Heated Grip / Indicator) which may indicate a future possibility.
Change owner / Register used Stromer / Remove Stromer from the app
Stromer writes
Stromer Speed Pedelecs offer motor assistance up to 45 km/h (28 mph) and are therefore legally light motorcycles in the L1e-B class as defined by Directive 2002/2004/EC (USA: Class 3)
Vehicles in this category must be registered and insured in most European countries.
Before driving your Stromer for the first time, be sure to find out about the applicable national regulations for this vehicle category from your registration authority.
> See also here in the FAQ - 'Laws and regulations for S-Pedelecs'
The seller must delete the Stromer from his OMNI app profile. **
Registration with the Stromer dealer It needs the old vehicle registration document, the license plate registered in your name and the VIN number.
It is advisable to install the OMNI app on your smartphone before visiting the retailer. The required PIN will be sent by email after registration and can then be changed.
Registration via QR code From FW 4.3.3.2 (March 11, 2021) there is now the menu item 'Registration' in OMNI under MENU > BIKE > OMNI which allows you to register a purchased Stromer using a QR code.
How does it work? Display the QR code on your Stromer display under MENU > BIKE > OMNI > REGISTRATION > NEW CODE. In the Omni app under Profile (bottom right), go to the menu item "Add another Stromer" and scan the QR code. > How to Video
** Update FW 4.3.4.5 (6-10-2021) If a new QR code is requested in the Omni under Menu > Bike > OMNI to connect a 'Stromer OMNI user account', the system checks whether a user account is already connected to this Stromer. If a user account is already connected, a message is displayed instead of a QR code.
Stromer cannot be removed If the Stromer cannot be removed from the Omni app, please contact your dealer.
Helmet - Which regulations apply?
Switzerland
Riders of a so-called fast e-bike (maximum design speed of up to 30 km/h and any pedal assistance up to a maximum of 45 km/h; Art. 18 let. a no. 2 VTS) must wear an approved bicycle helmet in accordance with the EN 1078 standard (Art. 3b para. 3 VRV).
Netherlands
In this case, the method used by the NTA (NTA= NThe Netherlands Technical Afspraak), the e NTA 8776 helmet standard for fast e-bikes was introduced on January 1, 2017. In Switzerland, a conventional bicycle helmet is theoretically sufficient for riding an S-pedelec. The test criteria of the NTA 8776 helmet standard are adapted to the faster speeds of electric bikes and are around 20 percent higher than the conventional EN 1078 standard.
Belgium
NTA 8776 is not a requirement in Belgium.
Overview: If you want to pursue your passion for riding an e-bike abroad, you must be aware that different regulations often apply there. There are differences, especially when it comes to mandatory helmets or equipment (e.g. lighting, rear-view mirrors).
Stromer helmets: The UNIT 1 helmets offered by Stromer do not yet (as of April 2024) have an NTA 8776 test mark.
> See also here in the FAQ: 'Laws and regulations for S-Pedelecs'
Helmet - On the Faro (Unit 1), does the indicator function & brake light work together via the OMNI?
See here in the FAQ the topic: 'Bluetooth - Smart Helmet & Smartlock - why both don't work'
Homologation (CoC)...
See here in the FAQ: 'Modifications to the Stromer - homologation/conformity or type approval (CoC)...'
Import/export of a Stromer (Switzerland)
Does this make sense and if so, what do I need to bear in mind?
The stromerforum.ch user 'beamster' answers this question here: When importing into Switzerland, the form Test report 13.20 A (CHF 90.-) can be obtained. This can be used to present the electric vehicle at the relevant motor vehicle inspection (MFK). The numbers will be compared (CHF 80.-) and after a few days you will receive the vehicle registration document (subject to a further CHF 70.-)
The stromerforum.ch user 'frugalist' answers this question here: I also bought my Stromer ST7 in Germany. Properly exported and cleared through customs (QuickZoll app). At the STVA (Road Traffic Office), they wanted the original COC document and the customs receipt to register for the vehicle inspection (because it was imported). The MFK creates the form Test report 13.20 A at the "presentation", where everything is looked at and compared. It doesn't take much effort and after the vehicle inspection I immediately received the vehicle registration document and a license plate.
Summary
Import into CH: The CH needs the Test report, the individual form 13.20 A so that the Stromer can be registered. This is issued by the STVA (Road Traffic Office) when the vehicle is presented. The original CoC (Certificate of Conformity) of the imported Stromer and a customs receipt are also required.
Export from CH: The CoC itself would not be a problem, as it is supplied for all bikes sold in the EU. However, Stromer does not offer this for Stromer bikes sold in Switzerland, or does not issue it. And no export to the EU without a CoC. In Switzerland, the vehicle registration document is issued instead of the CoC.
Chain - number of links / brand?
The number of chain links depends on various factors. You need the length of the chainstay, the number of teeth on the (largest) chainring and the smallest sprocket as well as the number of teeth on the chain rollers. Once you have all the information, you can calculate the number of links with a Chain calculator be calculated.
The following table is calculated for the Stromer model range.
Tip: Before replacing, count the links of the old chain and then order.
What does Stromer use?
KMC chains are usually used. Since a Shimano changer and a cassette are often used, Shimano chains are also suitable.
KMC e11 EPT / Shimano CN-8000 (11-speed)
Alternative: Shimano CN-HG701-11
Alternative method
Shimano describes a pragmatic solution (old. Link) for determining the chain length. The method depends on how the chain ends are connected: "quick link" or "rivet pin".
To measure, the chain is placed on the largest chainring and the largest sprocket and brought together at the rear part of the cassette sprocket.
Chain - measure wear
If the rear derailleur is correctly adjusted, a worn chain can be recognized by the fact that it slips when pedalling. The problem occurs gradually, initially only when pedaling hard, then more and more also when accelerating on the straight.
The wear can be measured, the easiest way is with a Chain gauge.
Another option is the measuring gauge or caliper gauge. To do this, set the gauge to a length of 118 mm. Then insert the gauge at any point on the chain between 10 chain links. Now open the caliper until it rests against the rollers of the chain links.
Display:
119.50 mm = chain is new
120.25 mm with aluminum sprocket and chainring = worn
120.50 mm with steel sprocket and chainring = worn
Keyless - What does that mean?
Perhaps you have already come across the term 'KEYLESS' while reading through 'Stromerlektüre'. Translated, this means 'key-free' or 'keyless'. In Stromer wording, this describes the fact that the battery can be removed from the battery compartment without a key. The battery compartment is unlocked (EJECT) via the Omni display.
Komoot - Can Stromer really Komoot?
Anyone who plans their routes with Komoot may have come across the following entries. It seems that Komoot can send navigation instructions to the Stromer Omni.
What technology does Stromer use for the OTA (Over the Air) functions of the Stromer?
Which mobile phone providers does Stromer use?
Is connectivity free?
Does it work worldwide?
Chargers & alternatives; status displays & charging times...
See AKKU - 'Chargers: alternatives; fast charging; status displays; charging times; replacement plugs'
Light - Switch off main lighting
The question repeatedly arises as to whether the main lighting (low beam / headlights) on the Stromer can be switched off. Until around 2018, this was possible and could be set in the Omni service menu. Although the newer Stromer models (from ST2, 2014) are largely equipped with the distinctive Stromer U daytime running lights, the main lighting can NO longer be switched off on these. Only the daytime running lights can be deactivated in the Omni's service menu.
Light - How to adjust?
Adjusting the headlights
Step 1: Position the bike five meters in front of a wall in the dark. Mount the headlight on the handlebars or head tube and measure the height from the ground.
Step 2: Measure the same height on the wall and mark with tape or chalk. Add a second mark halfway up.
Step 3: Switch on the spotlight and aim the brightest point at the lower mark. If no light falls over the upper mark, fix it. Otherwise, tilt the lamp a little further down.
Adjusting the rear light
The rear light is primarily for your own visibility - the risk of glare is low. Mount the light at a height of 25 centimetres to 1.20 meters and make sure that panniers or blowing coats do not cover it.
Legal background
DE: The Road Traffic Licensing Regulations (StVZO § 67, paragraph 3, sentence 2) says: "The headlamp must be adjusted so that it does not dazzle other road users". The legal text was adapted to modern LED lights in 2017.
CH: The Ordinance on the Technical Requirements for Road Vehicles (Art. 179a para. 1 VTS) for motorcycle lighting: "The lights must not dazzle and must be visible at 100 m at night in good weather conditions."
There is no precise definition of how this requirement is to be achieved in the law.
MCU - What is it?
The motor control unit, also known as the controller, is referred to as the MCU. It houses the motor's control and power electronics. The installation location varies depending on the model. Old models such as the V1 / V1.1 had the controller installed in the motor. Then, depending on the model, it was installed in the battery compartment (e.g. ST1 / ST2-Belt / ST7) or under the down tube, where it is located under a PVC cover. It is controlled by control signals generated by the Omni on the basis of the 'voltage' from the TMM pedal sensor.
Stomer has two models in use: an IPS controller (Information Processing Standard) from ASI (Accelerated Systems Inc.) with preset values and a programmable controller from EDS (Eloquent Design Services), which can be individually customized.
You can look up which model is installed in the Stromer in the Omni: OMNI > MENU > SYSTEM > ABOUT > 'Peripherals > MCU'
EDS MC3 - Controller 12 V
Model range - Which electric cars are available?
In addition, there were and are various special and limited editions. The development of the model range can be here or also here can be read here.
Engine - repair, paint peeling off, spokes torn out...
The older Stromer models ST1 / V1 / V1.1 (without Omni) could not be updated with Bluetooth or Over the Air (OTA). The power and motor electronics were housed in the motor. The so-called 'short-circuit plug' was used for this purpose:
restart the engine (reboot)
install new firmware
Omni App - Engine tuning/speed levels
See OMNI / DISPLAY V1, V1.1 - 'Sensors / speed levels / engine tuning'
Omni App - pair new or used (change of ownership) Stromer
Stromer OMNI C
Carry out the following steps when you first take your Stromer to the OMNI App would like to add:
Make sure that your Stromer bike has reception.
Open the OMNI app on your smartphone and click on "Add Stromer".
Call up the menu on the bike display, select "BIKE" and then "OMNI".
Click on "NEW CODE".
Now use the OMNI app to scan the QR code shown on the bike display. If the QR code is not recognized by your smartphone, you can enter the displayed numerical code manually instead.
If you already have a Stromer in your OMNI app and want to add another bike, proceed as follows:
If you have purchased a Stromer with the OMNI BT app, your dealer will need the e-mail address of your Stromer account, the VIN number of the bike and your personal details.
If you do not yet have a Stromer account, you can register with a Stromer dealer create an account or download the Stromer OMNI app and create an account yourself.
Electronic components can be exchanged 1:1 within the respective model without the involvement of the dealer or myStromer AG.
The OMNI is an exception. It is registered in the Stromer database with a unique VIN (chassis number). If the Omni is replaced, it must be re-registered in the portal. This can only be done by a Stromer dealer or myStromer AG.
Maintenance - chain and belt - what does Stromer say?
Stromer recommendations
Stromer describes how the chain or belt should be maintained in the Operating instructions. The supposedly low-maintenance belt drive has a considerable number of do's and don'ts.
Personal practice, oiling the ST3 chain
Oiling: Every 500 - 1,000 km, depending on the degree of soiling. How: First, I pull the chain 2-3 times through a cloth sprayed with chain cleaner. Then I apply a small drop of oil to each chain link, let it work in briefly and then pull the chain through a clean cloth twice. This keeps the drivetrain smooth, almost noiseless and there is no 'anointing' on the frame, chain, cassette and pants.
Every few thousand kilometers I dismantle the chain for a thorough cleaning in an ultrasonic bath. You can also use a large glass or a bowl of petroleum or white spirit.
I also clean the chainring, the chain rollers and the cassette.
Mileage: The KMC e11 EPT has a mileage of around 10,000-11,000 km. Then I change them together with the 11 sprocket. Every 2nd time the sprockets 13 / 15 / 17 / 19 are added depending on the wear.
Care material
I use the chain cleaner Muc-Off De-Greaser Aerosol Degreaser and the chain oil Dr. Wack 100. Any other chain oil can be used. Some manufacturers differentiate whether the oil should only be used for dry operation or is also suitable for wet riding. An example is the Muc-Off Dry or Wetlube.
Alternatively, the chain can also be maintained with wax. However, wax must be applied even more frequently than chain oil, but has the advantage that it absorbs much less dirt and dust and therefore keeps the drive cleaner.
> See also SHIFT - CHAIN / BELTS - 'Comparison: costs / care / (life) maintenance' > See also PROBLEMS - chain (nblade) / pulleys - 'Broken belt / has lost teeth' > See also 12 tips for preventing premature damage to rhymes > See here the recommendations from Gates
Care - lubrication and ointments help everywhere - really?
What, how and how often should be checked and lubricated is specified in each Operating instructions under MAINTENANCE / MAINTENANCE:
'Chain / Strap'
'Inspection plan' and 'Lubrication'
In principle, Stromer's recommendations should be followed. However, it is important to differentiate whether the Stromer is only used as a 'fair weather bike' or for 'all weather'. If you often ride in the rain or even in winter on roads exposed to salt, more frequent maintenance is required, especially for the drivetrain. Water and salt water must be removed, the belt cleaned and the chain lubricated after a ride.
> See PIMP mySTROMER - 'Care / cleaning of the Stromer'' > 'Clean properly'
Forgotten your PIN?
ST1, ST1 X, ST2, ST2 S, ST3, ST5, ST7 (OMNI Interface, OMNI Interface C) If you no longer know the Stromer PIN, you can create a new PIN in the Stromer OMNI app (Configuration > Change PIN). After entering and confirming the new PIN twice, it is automatically sent to the bike and via SMS to the registered cell phone number.
The PIN can only be generated if the Stromer is switched on and has good mobile phone reception.
QR code sticker - What's it all about?
See TMM SENSOR - 'The QR code sticker - what's it all about?
Wheel bearing?
See here in the FAQ: 'Rims / hubs / wheel bearings - Which brands does Stromer use?
Frame and handlebar geometry - Terms
The frame of a bicycle / pedelec, S-pedelec, MTB... consists of many individual parts. If you talk about reach, backsweep, stem or fork travel, this is the normal naming in technical literature, but in everyday life it usually means little to the layman. In the here I have summarized and illustrated the most important terms and designations.
Registration - Customer account / Dealer
A new customer account can be created via the retailer or registered directly in the Omni app. See also the video from Stromer: "How To: Add a Stromer to the new OMNI app" (EN)
Registration - used Stromer with the Omni app
Omni C
In order to use the Stromer OMNI app for your used Stromer, you must have an authorized Stromer dealer. Stromer dealer connect the bike to your Stromer OMNI account.
In addition, ask the seller or previous owner of your Stromer S-Pedelec to request the transfer of the Stromer from their dealer or to delete the Stromer from their Omni app. This ensures that the dealer has actually sold the vehicle or wants to sell it.
Download the Stromer ONNI app to your smartphone (from the Apple App Store or the Google Play Store).
Your dealer will create a Stromer OMNI account for you.
Provide your dealer with the following information:
First and last name
E-mail address
Cell phone number
VIN of the purchased/sold Stromer
As soon as your dealer has registered you, you will receive a PIN code on your smartphone. Then go to "Settings"/"Change PIN" in the Stromer OMNI app and generate your own PIN. This is automatically sent to your bike and your registered cell phone number. You can now make full use of your used Stromer.
See also the video from Stromer: "How To: Add a Stromer to the new OMNI app" (EN)
Omni BT App
If you have a Stromer ST1 with OMNI BT App purchased, we need the E-mail address of your Stromer accountwhich VIN number of the bike and personal details. If you do not yet have a Stromer account, you can register with a Stromer dealer create an account or use the Stromer OMNI app and create an account yourself.
Tires - Size designations / Current tires
Wheel tires do not have a uniform Size designation which makes a direct comparison difficult. Three designations are common:
Tires - Change
Stromer uses tires from Pirelli and Vee Tire. There are also differences in the design, so-called clincher or folding tires. The current tire line-up (as of May 2024) includes both clincher and folding tires. The clincher tires in particular are very difficult to get off the rim when changing, e.g. due to a puncture. If you use the wrong tool or procedure to change the tire, you risk damaging the rim or the tire bead.
These two videos, for example, show the easiest way to deal with 'stubborn' rims / tires:
For S-pedelecs with a maximum speed of 45 km/h, special approval of the tires is required. They must comply with the ECE-R75 approval valid throughout Europe.
Stromer recommends the following tire pressure: ST5 | ST3 | ST1 (27.5″ tires): 2.2 bar / 32 psi ST2 S | ST2 | ST1 X | ST1 (26″ tires): 3 bar / 43.5 psi
The permissible pressure range is specified by the manufacturer on the tire sidewall. Here is the Pirelli Cycle-e ST of the Stromer ST3.
The higher the air pressure, the lower the rolling resistance, wear and susceptibility to punctures. The lower the air pressure, the greater the comfort and grip of the tire. The pressure range should not be exceeded! As more weight is placed on the rear wheel, the pressure can be set 0.2 to 0.4 bar higher than for the front wheel.
The air pressure should be checked and corrected at least once a month. Even the tightest bicycle inner tubes lose pressure continuously. A pressure loss of 1 bar per month can be considered normal. The pressure loss is significantly faster at high pressures and significantly slower at low pressures.
Recuperation - what is it and what are its benefits?
With FW 4.4.3.4 from Feb. 7, 2024, a new version of the Omni App (iOS=4.0.0 (2833)) was delivered at the same time which contains the new function 'RIDING DISPLAY'.
It transfers the essential parts of the driving parameters from the Omni to the Mobile.
Furnishings
> Installation instructions / FAQ / Troubleshooting: See myStromer AG (EN / EN)
The setup is done in a few steps. This is briefly explained on the start page of the Omni under 'Further information'. To be able to use Smartlock and the Riding Display together, an existing connection with 'Smartlock' or 'Helmet' (in the Omni under Menu > Bluetooth) must be disconnected from the Bluetooth connection. You will be asked whether you want to activate the 'Omni App' option. Only when the classic way (Omni > Menu > Bluetooth > Smart Lock) has been deactivated, the smartphone can be re-paired with Bluetooth (Omni > Menu > Bluetooth > Omni App). If this is successful, the 'Riding Display' and 'Smartlock' can then be activated and used in the 'Omni App' under 'Configuration'.
To display the Riding Display, you have to tap on 'Riding Display' in the Omni app. It will then appear in the Omni app.
Riding display and SmartLock
When using the Riding Display, the 'SmartLock' function is also integrated into the Omni app and can be set in three steps in terms of sensitivity under Configuration. The classic 'Smart Lock' version in the Omni is more finely graduated and has 10 levels.
Bluetooth display
With the classic Smartlock, the BT symbol is displayed in the Omni and the Omni app and the Stromer is displayed as 'connected' under BT in Mobile.
Experience (as of 1/2025)
I had no problems setting it up (iPhone 15 Pro), but the connection with BT is unstable and the riding display is not usable in practice. I am apparently not alone.
Experience (as at 3/2025)
With the firmware update 4.5.0.3 (05-03-2025), Smarlock no longer works for me via the Riding Display.
Note
Smart Lock via the Omni app cannot be used on several Stromers at the same time.
See also PROBLEME - SMART LOCK - 'What is Smart Lock'
Roseberger plug / socket - What, Where...
See ELEKTRIK & ELEKTRONIK - Cable diagrams | Pin assignment - 'Rosenberger - Plug connection'
Hose - Which one is needed?
Alternatively, there is the Air Plus. This is thicker, contains more butyl rubber and ensures that you need to use the air pump less.
Tip: You can carry a GAADI tube with you for quick repairs on the road. This tube with two ends is much easier to fit as the rear wheel does not have to be removed. Furthermore, there is no need for the tedious search for leaks and patching the hole on the road.
An assembly video from Gaadi is available here or here.
Key - replacement for CAMLOCK locks
On older Stromer models (ST1 | ST2 | ST2S), Stromer used a mechanical locking mechanism with a tubular key for the battery compartment.
All keys are provided with a number. You can also find these in the Omni app under: Profile (bottom right) > Service booklet > Bike components > Keys.
A replacement key from the electricity dealer or CAMLOCK be ordered. However, the matter is expensive: (Source). Here are the prices at Camlock (as of 2022):
One key = 13,09€
Minimum order value = 50€
Shipping = 18.60€
Screw missing in the right dropout - really?
See PROBLEMS - MISCELLANEOUS - 'ST3 Pinion / ST5 - Dropout with missing bolt?'
Serial number of a component - Where can I find it?
A few serial numbers can be found in the Stromer OMNI app under Profile > Service booklet in the 'Bike components' section.
The VIN (Vehicle Identification Number) of Stromer S-Pedelecs is the official number with which a Stromer is registered in the CoC (Certificate of Conformity) in the vehicle documents and at Stromer. It is required for service work as well as administrative changes (change of owner...).
The VIN can be found:
in the OMNI app under PROFILE (bottom right) - Service booklet > VIN
on a sticker in the battery compartment
under the right-hand chain stay
Service recommendations from Stromer? / Service display in the Omni
With the firmware SUI FW 4.3.9.5 (10.08.2022), Stromer has introduced a service recommendation in the Omni:
The service icon on the OMNI interface appears after the first 500 km
A new service recommendation appears after 1 year or 3,000 km after the last service
The service interval can be configured by the dealer
In the Stromer OMNI app, the service can be reset and the service reminder can be switched on/off > Omni app > Profile > Service: Reminder= inactive).
After purchasing a new Stromer, it is advisable to have an initial service/check carried out by the dealer after 300-1000 km. This should be free of charge and is part of the purchase.
Service recommendation
Which service work should be carried out and when can be found in the operating instructions. However, the way in which the Stromer is used is also decisive.
Some drivers use the Stromer rather homeopathically, others extensively.
Some are 'fair-weather riders', others ride in 'all-weather' conditions.
Some maintain the Stromer, others little or not at all.
Whether you do it yourself - or have it done - is a personal decision and probably also depends on your DIY skills. Going to a dealer is certainly not cheap, but you are on the safe side, provided the dealer is reputable.
My practice
User profile ST3 (j. 2019). Rarely wet driving, no salt in winter, recuperation used.
Service display I have deactivated the service display and do all the maintenance work myself.
Maintenance The chain and drive unit are regularly maintained. The wheel bearings and bottom bracket are not lubricated.
Cleaning I just clean the bike with a bucket of water and a bit of washing-up liquid, a sponge and a microfiber cloth. Then I apply Muc Off BikeProtect on. I also check visually:
Check the brake callipers for traces of oil and secure the brake pads
The caster of the front wheel
Check the bottom bracket for smooth running and lateral play
Check the cassette and freewheel for play
You can also hear or notice when something is mechanically wrong. The drive becomes louder or jumps if it is dirty or worn. The steering creaks or hitches. If something is wrong with the brakes, you can hear and feel it ;-).
Smartlock - What is it / Settings and troubleshooting
See PROBLEMS - 'Smartlock (formerly 'Seamless ride')'
Smart.Shift app from Pinion - Does it work with a Stromer?
The ST5 Pinion and ST7 models use the Pinion C1.9 and C1.12 gears with Smart.Shift. Pinion offers the app'Pinion Smart.Shift' with which you can configure the gearshift.
Does this work with Stromer? The answer is no.
> See also SCHALTUNG - PINION - 'Smart.Shift App'.
In the area of electric vehicles is the State of health, SoH) a Quality measure for the condition of a Battery (or one Cell or one Battery pack) compared to their ideal conditions. The SoH unit is percent (100 % = the condition of the battery corresponds to the specifications of the battery).
In contrast to the batteries in electric cars, the space in e-bikes is severely restricted, the weight is limited and thermal management of the battery is not possible. Furthermore, ideally you want to achieve the maximum possible riding distance with the greatest possible support. All in all, this means that the batteries are under a lot of strain.
In addition to chemical ageing, Li-ion batteries are usually operated to the limits of their operating parameters. Gentle treatment, such as an ideal operating temperature range, gentle charging and discharging currents, a limited charging stroke DoD (Depth of Discharge) or a limited charging window are not available.
As a result, the batteries age quite quickly. Stromer is not spared from this either. The design of the models as fast commuter bikes also puts a strain on the battery.
'Theory & terminology compendium for Li-ion batteries'
etc.
Update August 2025: With version 4.0.5 of the Omni app, the SoH can be viewed on the start page of the app under Charging add-ons. See also here.
It can be requested from the dealer.
Stromer sound - what is it?
Stromer introduced the 'Stromer sound' with the ST5 Pinion model (Limited Edition was available from Dec. 2023). What this is and what it sounds like can be seen in the video here can be viewed or heard.
Stromer does not start - what to do?
See PROBLEMS - BATTERY, BATTERY - 'Battery cannot be ejected, Stromer does not start'
ST7 - Open battery compartment without power?
See PROBLEMS - BATTERY - 'Battery cannot be ejected, Stromer does not start?
Test Runner - What, where, how?
There is a so-called System Integration Test (SIT) in the Omni Service menu. The test routine itself is called Test Runner and can be used to test the components installed in the Stromer, such as the motor, controller, battery, brakes, sensor, etc. It can be accessed from the Omni Service menu. It can be accessed via the SERVICE MENU - RUN TESTS.
BQ983 battery: 21,000 km until SoH 74% was reached
* Replaced at 4,300 or 13,487 km due to squeaking
See also:
> See also PROBLEMS - chain (-blade) / pulleys and belts:
,Chain jumps, slips, crunches, is thrown off'
'Chainring / bottom bracket - wear and tear?
'Broken belt, has lost teeth'
> See also SCHALTUNG - 'Comparison: costs / care / (life) maintenance' under life expectancy
> See also here in the FAQ:
'Chain - measure wear'
'Number of chain links / brand?
Care...'
VIN (Vehicle Identification Number) - Where can I find this?
The VIN (Vehicle Identification Number) of Stromer S-Pedelecs is the official number with which a Stromer is registered in the CoC (Certificate of Conformity) in the vehicle documents and at Stromer. It is required for service work as well as administrative changes (change of owner...).
The VIN can be found:
on a sticker in the battery compartment
under the right-hand chain stay
in the OMNI app under PROFILE (bottom right) - Service booklet > VIN
Wicket Cable - What is it
Wicket, from the English, means gate. On Stromer, these are cable distributors with a Rosenberger connection or, on older models, a Sub-D 7 connection, which are installed directly at the lower end of the battery compartment. They connect the battery to the bike's electrics and are effectively the gateway from the battery to the bike.
Where is it installed?
ST5 - Bottom bracket area with cabling (wicket cable etc.)
Error E210003 or E21041A? > See ERROR AND WARNING MESSAGES
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