There is actually a really good reason to have a horizontal crossbar on a bike, in earlier days, bicycles were not made of materials as strong as today. The horizontal crossbar on the bike frame was introduced to increase the strength of the frame. The high-quality bike frames today are mostly made with carbon fibers, giving the bicycle much strength.
The bikes made today have frames strong enough that they usually do not require the addition of crossbars. The bike frames that still have horizontal crossbars are men’s bicycles.
Also it would seem that having a slanted crossbar like on women’s bikes would make much more sense for men’s bikes, decreasing the chance of racking the guy if he slips off the pedals or the like.
Horizontal bar poses a different kind of problem to women that mostly wore dresses. Mounting a bike requires lifting the leg over the crossbar, and if you are wearing a dress, that is bound to expose almost the entire leg.
The bike makers started making bike models with slanted the crossbar down to make the bike mounting more ‘dignified’ for women. Such designs were particularly for women, but they ended up weakening the bike frames.
Women do not necessarily have to wear dresses or skirts all the time anymore. Bless the time when the tradition ended! However, the tradition of making bikes without crossbars has continued.
Indeed, many BMX bikes for men are now designed with the slanted crossbar to reduce the chance of injury while performing tricks. The bike designs today do cater for different needs of men and women differently, but this does not include the ‘sophistication’ problems.
The high-end bike frames made with carbon fibers do not require crossbars, but the bike makers keep in mind the physical difference between men and women. The designs account for shorter torsos and arms of most women, modified hip placement, and even modified seat designs.
Fact about Bicycle:
The first model of bicycle that is principally the same as modern day bicycles was created by J.K. Starley in 1885 and was called the Rover. This bike featured the first successful implementation of a chain drive, which mounted to the rear wheel.