A bicycle is a two wheeled non-motorized vehicle (one behind the other) operated by the user sitting on it and peddling to propel it.
In 2063, an man was riding a bicycle just before the Borg attacked. The energy weapons they used blew up a nearby building, and sent him flying off the bicycle. (Star Trek: First Contact)
In 2151, when Enterprise investigated the disappearance of the Terra Nova colony, one of the things they found left in the abandoned city was a broken bicycle. (ENT: "Terra Nova")
- See also: Tricycle