Since bicycles work pretty flawlessly as it is, you might wonder just why we need crazy modifications like spokeless wheels and the ability to ride sideways. Innovation never ceases, and as a result we've been treated to a wild assortment of ideas from giant amphibious contraptions to bikes that fold up into backpacks.
Some of these 15 concept bikes address issues like cost, portability and adaptability and others are just plain strange.
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