For every three men hopping on a bike, just one woman does the same.*

Although slightly more women check out a bike on weekends, overall, they still make up only 24.7 percent of riders.

(*Jeremy Singer-Vine, Buzzfeed)

[source: Mona Chalabi, FiveThirtyEight/] This gender gap isn’t unique to bike-share programs or these three cities. The most recent National Household Travel Survey shows that 24 percent of bike trips in 2009 were made by women. The national data also shows that women are slightly less likely to cycle now than they were in 2001; researchers found “the prevalence of any cycling declined significantly for children (by 1.5 percent) and women (by 0.3 percent).” That needn’t be the case: In Germany, 49 percent of cyclists are women. In the Netherlands, that number is 55 percent.

In fact, most theories fell into one of two categories: fashion or fear.

But what’s the evidence for each?

For her master’s thesis in urban planning at the University of Washington, Anne Broache examined which influenced women’s decisions about cycling. In 2012, she surveyed 365 women in Seattle — where 28 percent of bike commuters are female, according to the city’s Department of Transportation — about fashion and road safety. One-third of the nondaily riders and one-fifth of daily riders reported general concerns about “grooming issues, bringing spare clothes, helmet hair, and arriving at destinations red-faced and sweaty.” But safety was “by far the leading concern for all riders” – 79 percent of the women cited “distracted driving” as the biggest barrier to them cycling.

Although it didn’t ask about fashion, the 2010 Women’s Cycling Survey asked a lot more women about their cycling choices; it, too, found the No. 1 concern was “distracted driving,” which was cited by 73 percent of the 11,453 women questioned.

But there’s more to personal safety than the risk of traffic accidents. As @anildash suggests (and Helen Pidd’s personal account on The Guardian’s Bike Blog illustrates), female cyclists might fear sexual assault and harassment. The Women’s Cycling Survey found that 13 percent of women said “stranger attacks” were a concern.

And just as fear is a complex issue, so, too, is fashion. Lifestyle barriers affect women’s decision-making around cycling in ways more challenging than footwear or hem length. When the Bikes Belong Coalition surveyed almost 2,000 U.S. adults, they found that women were twice as likely as men to report an “inability to carry children or other passengers” as a factor that discouraged them from cycling. Convenient transport is important for moms, because they spend 3.7 minutes more per day than dads ferrying kids around.

Finally, one more reason women aren’t getting on bikes can’t be captured by the fear or fashion explanations; like most lifestyle choices, cycling decisions are affected by wealth. And women earn less than men. As Clarissa Ersoz at the Bicycle Paper explains, “Even a reasonably priced bike is a significant up-front expense for disadvantaged households.” A 2001 report on the Socioeconomics of Urban Travel found that households earning less than $20,000 were the least likely to include cyclists (just 13.5 percent compared to 32.8 percent of households earning $40,000 to $75,000).

When it comes to the why of America’s cycling gender gap, the data suggests that fashion really isn’t front of mind for most women. Instead, road safety and practical lifestyle issues are the biggest obstacles to female riders. That makes it all the more disappointing that the recent bike-share data shows that rental systems have been unable to address those concerns.