Who are the "real" UCI Hour Record holders?
The rule was changed in 2014 to allow modern track bikes, ie tri-bars and disc/aero wheels, but no "superman" positions. From 1997 to 2014 only "conventional" bikes were allowed, like bikes in the 70s, ie no aero stuff, only drop bars and box section rims and wire spokes, etc.
The men's version, since the rule change, has been officially broken several times, with Wiggins currently holding the record at 54.526km, done of course with tribars and aero wheels. But if you look back at all the records set with a similar bike set-up, the last one was by Tony Rominger at 55.291km in 1994!