I have a single speed in amongst my herd of bikes. It has a flip-flop hub, but I've never tried riding the fixed side. Why? When I leave my house for a ride I have hills to deal with in any direction that I don't think I could handle on a fixed gear. Just coasting down these hills not even in a tuck would mean hitting 40+mph. I'm sure I couldn't spin that fast on a fixie so I'd have to brake to get down the hill, which seems so illogical
