AI search, numbers, photos & co.: What could help after a bicycle theft

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A case from Munich shows how closely traditional police work, online platforms, and modern technology are now intertwined. After a woman's bicycle was stolen, she discovered it again on an online platform a short time later, according to the Munich police. Instead of contacting the seller herself, she turned to the police. The officers then arranged a fake purchase appointment, during which a man opened the door and was temporarily arrested.

During the subsequent search, investigators found a total of 22 stolen bicycles and numerous matching keys in the apartment, basement, and in front of the house, according to police information. While the operation was still underway, a flatmate appeared with more keys; she was also arrested. The main suspect, who is known to the police, is currently in custody.

This raid is not an isolated incident. Online platforms are considered central marketplaces for stolen bicycles, including e-bikes. According to the police criminal prevention agency, the police registered around 245,900 bicycle thefts nationwide in 2024 alone, as well as tens of thousands of thefts of mopeds and motorcycles. According to the police, common crime scenes are large parking facilities at train stations, schools, or recreational areas.

Where bicycle thieves strike particularly often

Statistics indicate that bicycle theft depends heavily on the place of residence. Major cities in particular are considered hotspots. Rankings show that Leipzig, Berlin, Cologne, Bremen, Frankfurt am Main, and Hamburg, among others, perform particularly poorly. At the same time, despite declining case numbers, financial damages are increasing significantly: the average damage per bicycle is now close to 1000 euros, as thieves are increasingly specializing in high-quality (e-)bikes.

The large number of recovered bikes in the Munich case suggests a structured approach. Bicycles are stolen over weeks, temporarily stored, and gradually offered online. It was noticeable that matching keys were available for many bikes. According to the police, this is typical for serial offenders who specifically tamper with locks or steal them along with the keys to resell the bikes later without effort.

Legal gray areas in online purchases

For buyers, a tricky question arises: What happens if you unknowingly acquire stolen goods? A ruling by the Karlsruhe Regional Court shows that not every buyer is automatically liable. Those who have no indication of an illegal origin are not guilty of receiving stolen goods. However, this can be different with extremely cheap "bargains" – then the accusation that one knowingly accepted the theft can apply.

AI-assisted search

In addition to classic research, artificial intelligence is increasingly being used to find stolen bicycles. An example is the AI-assisted bicycle search "Whembat", which arose from the founders' shared frustration over empty bike racks and unsuccessful searches. The name stands for "Where's My Bike At?!" After uploading a photo, Whembat automatically searches online marketplaces, social networks, and available data sources for possible matches.

In criminal investigations, the unambiguous assignment of bicycles is often crucial. Accused persons typically claim to have "found" a bike or bought it legally. The police therefore recommend keeping all available proof of ownership: purchase receipts, frame numbers, photos, or individual modifications significantly facilitate proof of ownership. The police also recommend bicycle coding or engraving an individual code into the frame, as well as keeping a bicycle passport. These measures deter perpetrators and help the police and lost and found offices to clearly assign recovered bikes.

GPS trackers, smart bike locks, and the right reaction after theft

GPS trackers and smart bike locks, which alert upon movement and provide position data, are increasingly being used. According to the police, such systems can help to find stolen bikes – however, those affected should never intervene themselves, but should report the theft immediately and provide the tracking data. heise also recommends proceeding systematically after a theft: Report the theft, inform the insurance company, and keep an eye on online platforms.

Despite all the technology, the basis remains good mechanical security. High-quality U-locks or armored cable locks and consistently locking them to fixed objects are still considered the most effective deterrent. Smart bike locks can usefully complement this security, but do not replace it.

(mack)