2025-09-04 00:00:00 With Call a Bike, you are spontaneously and flexibly mobile around the clock. Whether you're on your way to work, after work or on a city trip, with Call a Bike you can rent a bike at any time and anywhere in Germany. A total of 13,000 bikes are available in over 80 cities. You can also use the app to hire a bike from StadtRAD Hamburg and Lüneburg as well as RegioRadStuttgart. All bikes are displayed on an interactive map in the app. You can rent them using the QR code or by entering the bike number.