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Dirk Auer (36) is considered to be the most extreme  inline skater in the world! He´s also more courageous than any other skater in the world. He has been the appendage of a Porche GTII for up to speeds of 307km/hour on skates (world-record), and he has raced on roller coaster tracks on inliners. His newest adrenalin rush for the winter season is racing down an ice channel on spiked inliners - pulled by a four-man bobsled! . Two hundred and twenty-four spikes in the 8 wheels of his skates. Every nail measures 2,5 centimeters for a maximum grip. Running at a speed of 122 km/hour, the first cramps in the calves come too quickly, but finally he reached the finish line.