If philosophical discussion of bicycle social issues do not belong here, moderstors please move this post.
short story: Why are bikes 'a guy thing?'
Long story: Whether as an elementary school boy or adult, in 1965 or now, in Asia or Canada, things remain more of less the same - girls (except in Vietnam and China?) do not ride bikes.
I can think of a few possible reasons some from Victorian era, some based on the different ways are brains are hardwired. Never the less I find it strange.