Mud, boulders and dirt bikes at the 2011 Erzberg Hare Scramble

Widely considered the most difficult off-road race in the world, the Red Bull Hare Scramble is the closing event for the Erzberg Rodeo in Austria. Thousands of riders tackle a course through and around an abandoned quarry in the alps, crossing terrain that includes muddy climbs and boulder-strewn slopes. Here’s 31 action photos and a time lapse video from this year’s race.

Photos: Philip Platzer/Erwin Polanc/Samo Vidic/Red Bull

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