Bike-sharing startups such as Mobike, Ofo, and Bluegogo, are completing fiercely in China. Rental bikes flood many cities, big and small. Users pay as little as 0.5 yuan (80 cents) for a ride. These bikes bring convenience and help reduce air and noise pollution, but they sometimes interfere with pedestrians and traffic. The big players in this field have launched operation in Europe, and are planning to come to the U.S.