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.