Belgian Walter Huybrechts is one of the leading Derny pacers in the world. Andrew Baker Huybrechts has a number of nicknames, including the Flying Fireman and the Beast. Andrew Baker Riders, including Huybrechts (no 6), take part in a Derny race during the Six Day London event. Justin Setterfield/Getty Images Europe Huybrechts helped Olympic and world champion cyclist Fabian Cancellara to victory in a Derny Criterium race in Antwerp in 2014. LUC CLAESSEN/AFP/AFP/Getty Images High speeds are a feature of Derny racing in Six Day competitions throughout Europe with speeds often well over 46 mph. Justin Setterfield/Getty Images Europe Mark Cavendish of Great Britain celebrates with Derny pacer Michel Vaarten after winning a race at the Ghent Six Day in 2014. Bryn Lennon/Getty Images Huybrechts and his fellow pacers tout their services at all the leading Six Day races in the world and also on the road. Andrew Baker Belgian Walter Huybrechts is one of the leading Derny pacers in the world. Andrew Baker Belgian Walter Huybrechts is one of the leading Derny pacers in the world. Andrew Baker Prev Next