Following the success of the smart bike-sharing system in Paris, these systems are rapidly being introduced in European cities for daily mobility. The basic premise of the smart bike-sharing concept is sustainable transportation. Such systems often operate as part of the city’s public transport system. They provide fast and easy access, have diverse business models and make use of applied technology (smart cards and/or mobile phones). Bike-sharing systems are currently operating in 78 cities in 16 countries using around 70,000 bikes. This paper reviews the state of the art of bike-sharing systems, drawing on experiences in selected European cities.