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This bike concept from Budapest has one giant saddle (a bench, really) built into the top tube that two people can sit on at once. In the rendering, the bike is constructed from 3-D printed materials, as well as wood and steel.
For wheels, it uses a 26-inch one out back and a 24-er up front for an aggressive stance and nimble city handling. It also comes equipped with disc brakes and can be geared or set up as a single speed.