Man skates down 860 metre roller coaster An adrenaline junkie has taken in-line skating to new heights and set a new world record after racing down a roller coaster at speeds of 56mph. Dirk Auer decided to go where no sane man or woman had gone before and skated down an 860 metre track in just over a minute. Wearing specially designed in-line skates, the German made the attempt on the Mammoth roller coaster at the Trips Drill theme park in Stuttgart. The 36-year-old admitted he had placed his life at risk by performing the daredevil stunt. 'This was a very dangerous stunt because there were so many factors to consider,' he said. 'The roller caster is wooden and so unlike rides made from iron and steel there was always a chance of the odd nail or screw that would not be entirely flat. Mr Auer, from Gross-Gerau near Frankfurt, is considered to be the most extreme in-line skater in the world. He already holds the world record for reaching speeds of 190mph as he was dragged along behind a Porsche GT2.