Running single speed is nothing revolutionary, it is going back to bare bones simplicity cycle mechanics, especially if running a fixed wheel. Much of my commuting and leisurely cycling with newbie friends has been done single speed. Once a good level of cycling fitness and the magic ratio is found it is a good simple way of propelling along. Single speed is enjoyed across the world, and around it by the impressive journey of Markus Stitz, who indeed cycled around the world single speed on his Surly Ogre. More info on Markus's website: http://markusstitz.com/ Many manufacturers have a single speed model in their range, however, there is much available to modify any bicycle to single speed, whatever rear wheel dropouts it has. But, the all time best, and simplest method of running a single bike is with horizontal slot dropouts enabling backwards movement of the wheel to tension the chain. Such chain, could be said to be one of t...