If you've ever had to lug a bike with you onto the train or bus, or up a steep flight of stairs, you can probably understand the appeal of lightweight folding bikes. But most of them are too light-weight to handle the demands of serious riders. Dominic Hargreaves was having the same struggles with folding bikes, and after failing to find one that he liked, he decided to make one for himself. The result was The Contortionist, a folding bike that twists around to fold itself entirely into the wheels' 26-inch circumference.