Hello! I am looking into a singlespeed to serve as an alternative to my regular geared one. I'm wondering how one goes about deciding just what ratio / gear inch to shoot for? Is it trial and error, or is there some methods / experiences that translate out well? I have heard that the "ideal" for flat areas in gear inches is somewhere around the height of the rider, in inches, but that seems awfully convenient. One would think you'd want something lower than that ideal, due to hills and winds.
Also, that was in reference to geared bikes, where I've heard it's harder to maintain the same RPM's as a single, which might complicate things.