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GutRad StVO Module: Ride Free — With Peace of Mind

You love the power and practicality of a Bafang BBS DIY conversion — but you want freedom, independence, and a safe, confident feeling every time you ride. That’s exactly what the GutRad StVO Module is built for: a professional hardware solution that brings your conversion onto a clear, compliant pedelec line — so you can ride relaxed instead of worried.

Why this matters

 

As soon as a converted bike is provided, sold, or put on the market, the situation can quickly shift from “private hobby project” to product responsibility — including typical obligations around safety, documentation, traceability, and potentially CE-related technical files. For one-off builds, proving things like shutdown behavior, electrical safety, EMC behavior, tamper resistance, and conformity can become complex and costly.

And even if you write “private sale, no warranty,” real-world liability risks don’t simply disappear. Add the common trap: many conversions accidentally cross the line where the bike no longer qualifies as a pedelec — which can trigger insurance and legal consequences. That’s stress nobody needs.

The GutRad solution: clear, safe, professional

 

The GutRad StVO Module is designed to help a Bafang BBS conversion behave like a pedelec setup again — with a strong focus on predictable, compliant operation:

– Supports pedelec-style operation (including 25 km/h pedal-assist behavior and a 250 W nominal continuous power approach in the StVZO context)- Throttle is disabled – less gray area, more clarity

-Built around safety logic, defined cutoff behavior, and a traceable compliance approach

– More confidence in daily life: fewer “what if” thoughts during inspections, after an incident, or when selling a bike

In short: keep the DIY fun — gain peace of mind.

Real benefits you feel

 

– Freedom: ride without constantly second-guessing your setup.

– Independence: a hardware-based solution instead of risky parameter “tuning.”

– Safety: reduce technical and legal risks with a defined operating concept.

– Confidence: especially valuable if you ever hand over or sell the bike.

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GutRad StVO Module for Bafang BBS UART

Bafang E-Bike

The GutRad StVO Module is intended for selected Bafang BBS drives using UART communication. Whenever the system is switched on, it establishes a defined and documented controller state for the intended Pedelec 25 configuration.

Why a controlled controller state matters

Bafang BBS01, BBS02 and BBSHD are configurable retrofit drives. Depending on the controller, software version and settings, parameters such as assistance cut-off speed, current limits and throttle functions may be changed. A model designation or a 250 W label alone therefore does not prove that the complete bicycle meets the applicable requirements.

The GutRad StVO Module addresses this issue by backing up the original controller data and checking or establishing the approved system profile at start-up. The actual combination of motor, controller, display, module profile and bicycle remains decisive.

Functions of the GutRad StVO Module

  • defined and documented profiles for selected Bafang BBS UART systems,
  • verification of the intended controller parameters whenever the system starts,
  • motor assistance only while the rider is pedalling,
  • motor assistance ending no later than 25 km/h,
  • the normal throttle function being disabled,
  • depending on the compatible system, start or walk assistance up to 6 km/h may remain available,
  • backup of the original controller data.

The module is not a vehicle approval

The module is a technical component. It is not an official operating permit or a blanket approval of the complete bicycle. Under section 1(3) of the German Road Traffic Act, classification as a bicycle requires, among other things, a maximum rated continuous motor power of 0.25 kW, assistance that stops when the rider stops pedalling and a cut-off no later than 25 km/h. Start or walk assistance may operate up to 6 km/h.

The construction and technical condition of the complete bicycle must also be suitable. This includes appropriate brakes, lighting and reflectors as well as professional installation. Anyone retrofitting or substantially modifying a bicycle remains responsible for the actual vehicle configuration.

Official wording of section 1 of the German Road Traffic Act

Do not confuse UART and CAN

The GutRad StVO Module described here is intended for approved Bafang BBS systems using UART communication. It is not approved for newer BBS CAN systems. Before ordering and installation, the motor type, voltage, controller, display and communication protocol must be identified correctly.

Select the compatible module and approved profile

The GutRad online shop provides the currently available variants, compatibility information and system profiles.

View the GutRad StVO Module for Bafang BBS UART in the online shop

This product information describes the function and intended use. It does not replace an individual technical assessment or legal advice.

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Faked 250W Product Sticker and the programming of Bafang BBS DIY controllers a legal issue?

Regulations for End Consumers of Bafang BBS DIY Motor Systems

Belief, Hope — or Certainty?

Reprogramming the performance parameters of a motor controller yourself is not automatically illegal. However, without verifiable evidence—or a proper Declaration of Conformity—showing what power limit has been set and how reliably it is enforced, a Bafang BBS motor system may be treated as requiring registration / approval rather than being considered a standard, compliant pedelec setup.

In addition, attaching a power label that cannot be substantiated (e.g., “250 W”) can be interpreted as intentional deception. For this reason, a self-made, purchased, or counterfeit CE label marked “250 W”—without supporting documentation such as the manufacturer’s Declaration of Conformity—is highly problematic and can, in serious cases, lead to vehicle seizure.

A CE marking confirms that the essential requirements of the applicable EU legislation (e.g., the Machinery Directive) have been met. In order to apply a CE marking, the manufacturer (or an authorized representative) must issue a Declaration of Conformity, confirming that the product complies with the relevant rules and standards. A video record of an installation or an assembly guide alone—without confirmation from a qualified specialist business—is generally not sufficient.

Under German product liability principles (ProdHaftG), anyone who retrofits a bicycle with an electric drive can be considered the “manufacturer” of the newly created product and may be held liable accordingly. From a legal point of view, the conversion can result in a new product. As a consequence, original manufacturer warranties may become void—especially regarding safety-critical issues such as frame failure or brake malfunction.

That said, the conversion does not automatically make you the manufacturer of every individual component involved (motor system, battery, frame, wheels, accessories). Those parts remain independent products of their respective manufacturers.

If you intend to change the manufacturer-specified power rating or other core functions, you will typically need one of the following:

  • a written statement from the manufacturer, or
  • an additional certified product supplied with manufacturer documentation, or
  • a declaration from a qualified company confirming and certifying the modifications carried out.

Furthermore, the system must not allow the maximum limits to be changed during operation and should be designed to be tamper-resistant.

Important note on Bafang BBS CE marking

Bafang BBS motors usually carry a CE marking for Electromagnetic Compatibility (EMC) only. This means there is no additional CE Declaration of Conformity covering power rating or operational safety in the sense required for a compliant 250 W pedelec classification.

Where to get reliable information

For binding clarification and official guidance, you may contact, for example:

  • the manufacturer

  • the local registration authority

  • a technical inspection body (e.g., TÜV)

  • a certified expert / assessor

  • a lawyer

  • competent regulatory authorities

  • specialist dealers and technical committees

As a long-standing specialist dealer and manufacturer, we are of course happy to help with factual questions and provide practical guidance.

Find answers

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The Streetlegal Module Bafang BBS01, BBS02 and BBS03 (HD) – D.I.Y. Motor Kits

The Streetlegal BBS Module

Our StVO Module for legal Bafang BBS operation throughout Europe!

The StVO module* was created to operate powerful BBS systems as a streetlegal EU pedelec (bicycle with pedal assistance). Quick and easy installed, no programming cable needed.

Our intelligent module is the only product on the market that allows a larger and more robust motor from the Bafang BBS series as a 25 km/h EPAC – without registration, insurance coverage or a driver’s license.

During the first use, the existing controller data is read and stored in the module. The module automatically adjusts the data of the controller for the operation of a pedal-assist bicycle with a maximum speed of 25 km/h and 250W nominal power output.

From this point on, the used BBS motor group (with correct wheel size adjustment) is adapted to the current regulations and is considered as a bicycle.

The original or personal parameter settings of the BBS controller can be restored with the GutRad Key, e.g. to remove the module again (data recovery) or for rides on private property.

If you decide to permanently store the StVO data in the controller and module, you can disconnect and reconnect the module in StVO mode. Afterwards the BBS system with the attached module is protected against any programming and tuning interventions.

The module is compatible with all UART Bafang and APT displays.

The use of EggRider displays, SpeeedApp, etc. is not possible.

*within the scope of the EU regulations for EPAC 25km/h bicycle act.

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