>> let's go under the helmet with max. in the desert in chile. he's setting off to break his own world record for the fastest downhill of a gravel-based mountain on a production mountain bike. >> they had scoped out this mountain with a 45-degree slope. chile seemed to be the perfect location. >> down he goes. he's wearing a full on aerodynamic suit with a custom built helmet. let's see what it looked like from his point of view. >> we've seen these things go wrong. a situation like this, if you have a mechanical failure, all bets are off. >> his suit isn't exactly protected. he's trying to keep it light. but if something goes wrong. >> on gravel. >> on gravel, he's going to be messed up. >> look at his heartbeat, just race up. and look at the speed he hits as well, nearly the same as his heart rate, 167.6 kilometers an hour, roughly 104 miles per hour. that's pretty fast for what they

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