Women ride bicycles one-third as often as men do.

What's up with that? Bike-sharing programs have some answers, such as where and when women are most and least likely to hop on a bike.

Three of the largest programs in the U.S. have published trip data that includes gender: New York's Citi Bike, Chicago's Divvy, and Boston's Hubway. While bikeshare habits don't necessarily reflect overall bike-riding trends, the data provides possibly the most detailed view of gender and biking ever publicly available for these cities.

In this map and the others below, you can explore the gender balance at each bikeshare station during the five months — July 1 through November 30, 2013 — that appear in all three cities' published data.