Hour record
In 1972, the Belgian cyclist Eddy Merckx set a record of 49.431 kilometres.  It was the record for twelve years.  Since that time technology has allowed much more aerodynamic bicycle designs.  The Union Cycliste Internationale (UCI), has made his design standard for their competitions.  There is now another record, the International Human Powered Vehicle Association (IHVA) hour record, for other designs.  The hour record for regular bicycles is called the UCI record.