He’s going for the Hour.
The Hour record in cycling is simple: how far can you ride in a single hour on a track bike? It’s done inside, alone, on a velodrome, and is more than a little bananas. Eddy Merckx set a record in 1972 that stood for twelve years; the current record is 30.9 miles, set in 2005 by Ondrej Sosenka, is only about a fifth of a mile farther than Eddy.
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