Let me start off by saying that I am relatively new to the whole cycling world. I am currently in the process of putting together a new wheel set for my Bianchi Pista (Japanese spec) and have a question regarding hubs. I have been looking at some second-hand Dura-Ace track hubs that were used for racing. They are noted as being fixed/fixed hubs. Am I correct in assuming that if the the rear hub is threaded on both sides that I could replace one side with a freewheel to convert it to a flip-flop hub? Thanks for your help.