But on the other side of the globe, Hangzhou, China has them beat with more than 60,000, according to a recent report by National Geographic.
To see how it all works, check out this short from Streetfilms:
Bike shares -- where a user can pick up a bicycle at one service point, ride it, and then drop it off at another and walk away -- are growing in popularity. China, along with many other developing nations, has a long-held cultural tie to bicycling. Demand for automobiles skyrocketed in recent decades, but in a city of 6.7 million like Hangzhou, it would be impossible to build enough roads to support this, not to mention environmental concerns.
Bike shares are cheap (nearly free for many in Hangzhou), highly accessible, and part of a sustainable urban growth model. Hangzhou hopes to expand its system to 120,000 bikes by 2020 and other cities are taking notice of its success. Companies in Beijing, Rio de Janeiro, and Mexico City are making a go of it and hope to remove the training wheels soon.