Bicycles have traditionally been different. First off, because the rider is also the engine, bicycle design has to be adapted to human anatomy, and bikes usually come in different sizes to fit taller or shorter riders (yet another reason to avoid department store bikes unless you're exactly average). But bicycles have also long had different designs based on gender, as well.
|Jamis Hudson, Men's Frame|
|Jamis Hudson, Women's Frame|
The bicycle, in fact, had a fairly large affect in the turn-of-the-century women's movement, as it offered both increased personal mobility for middle-class women and a reason to encourage Rational Dress over the more restrictive garments typical of the time.
|Advertisement from 1897 featuring a woman in cycling costume. Notice the baggy trousers to provide a skirt-like profile.|
The diamond shape of the typical men's frame is a bit simpler to make, and provides more strength and lateral stiffness than a step-through frame of the same basic design, as well as more room to mount accessories and water bottles. As the men's market for sport cycling has commonly been bigger, diamond-framed bikes also were offered at higher price points and with better components than those available on step-through bikes. Because of this, female athletic cyclists often chose to ride "standard" bikes rather than a supposedly female-specific design.
In recent decades, as the percentage of women in competitive and sport cycling has grown, and with it market demand for performance-oriented bikes for both halves of the human race, a new type of "women's-specific" bike has emerged. These bikes have a design similar to standard bicycles, but with the geometry and proportion altered slightly to take into consideration the common physical differences between men and women.
|Jamis Satellite and Satellite Femme (no, I'm not paid by Jamis, I just work at a shop that sells a lot of 'em so I have access to pictures).|
The assumption being that compared to a man of the same height, a woman would typically have longer legs, a shorter torso, narrower shoulders, slightly shorter arms and smaller hands. As a result, the bike would have a shorter top tube in proportion to its seat tube, narrower handlebars and sometimes smaller brake/shift levers.
Of course, this design relies on sweeping generalizations, as not all women are proportioned the same. These fit some female cyclists (and on occasion, a shorter male cyclist) very well, and others not at all. Many women are fine riding a standard bike, or a standard bike with some modifications. Still, it's a useful option for those who haven't been able to find a standard-geometry bike to suit their needs.
But back to the "boys and girls" or rather "standard and step-through" frame designs. Is there a need for modern women to ride a step-through frame, or any reason a man shouldn't? Aside from fashion, the answer is, as you may expect "do whatever you feel like." Some men might feel a bit self-conscious riding a pink, step-through bike, but fortunately, most manufacturers offer step-through frames in at least one gender-neutral color (black).
There are a few very good reasons to choose a men's (standard, diamond-frame) bike, including:
- Greater strength and rigidity
- More room for water bottle cages, bags and pumps inside the frame triangle
- Easier to hang on a car-mounted bicycle rack
- You don't have to swing your leg over it like a dog over a fire hydrant, which if you've got hip problems, is nice.
- If you're carrying a large rear load, or have a child seat on the back of your bike, it's much easier (and safer in the case of the kid carrier) to mount a step-through frame
- The lack of a top tube makes the bike more adjustable to fit a wider range of riders, handy if it's a "guest" bike (and the reason that most bike-share bikes are designed this way).