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The record dates back to 1876 and once carried immense prestige because of the greats who had attacked it over the years, including Fausto Coppi, Jacques Anquetil, Eddy Merckx and Miguel Indurain. It fell out of favour after a UCI ruling in 2000 that limited aerodynamic aids to those available to Merckx, and which removed from the record books distances set by Chris Boardman, Indurain, Francesco Moser and Graeme Obree. The new rules on aerodynamics – permitting anything that is currently allowed on the track – open the way for a bid by big names such as Wiggins and Cancellara, who also has his eyes on it.
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http://www.theguardian.com/sport/2014/aug/26/bradley-wiggins-world-hour-record-2015