I'd hate to have to pull out the rear derailleur and maybe have to put in a new cable. It's not the end of the world -- just extra work. I never have had a road fixed -- only a track bike for the track. I have five bikes -- all old steel and there is no room for another, nor can I get rid of anything because I'm attached to all of them. I guess the next question is are the fixed cogs and lock ring the same thread as English freewheel hubs. Sorry if this is a newbie question. I just don't know anything about fixed.

Garth