The problem with the program is that the company that runs Citi Bike— Alta Bicycle Share—is a small five-year-old company with the challenges that come with being a small five-year-old company. Alta runs other American bike-share systems, including Boston and Washington. But Alta has never run a system of New York’s scale and demand. There is no such system in America. Chicago, which comes closest, does less than a tenth of New York’s annual rides with the same number of bikes and more docks. Alta has found itself overwhelmed—having to spend more than it expected in “redistributing” bikes to meet time-of-day demand.