How far can you pedal a bike in an hour? It's a simple concept, but the hour record has pushed some of the most accomplished cyclists of all-time to their absolute limits, both physically and mentally.

Why is this event so legendarily brutal?

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Video Courtesy of:

NBC Sports
Global Cycling Network
INEOS Grenadiers

Alex Hutchinson for Outside Magazine: https://www.outsideonline.com/byline/...