According to industry consulting firm eCycleElectric, in 2017 about 36.5 million e-bikes were sold worldwide, mainly in China and Europe. In the United States, only about 263,000 were sold. But things may be changing, and ElectriCityBikes (4810 Wisconsin Ave. NW) wants to help. The e-bike shop, part of local chain City Bikes, opened in 2016, and has joined manufacturer-dealer Riide in the District and Arlington retailer Hybrid Pedals. Last month, ElectriCityBikes added locations in Adams Morgan and Rockville.