Le Wiki sez that on 18 November 1933 Marcel Berthet France trundled his laid back velocipede 49.99 km in one hour. That's 2 more than 47.89km.
http://en.wikipedia.org/wiki/Hour_record
which page goes on to say that the "standard" hour record passed this distance in 1966.
Not sure what set of limiting parameters make this, a good effort to be sure, a "world record."