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Video: Mountain biker tackles vertigo-inducing downhill run

Mountain bike expert Filip Polc is used to tackling the toughest downhill courses and this helmet camera footage from Innsbruck shows just how difficult the sport can be. Things were made even tougher by the fact that after a quarter of the way through the 4,2km long, 1000m drop track, the bike lost its chain and the gear cable became lodged in the rear wheel. Credit: YouTube/Filip Polc

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