Originally Posted by robertv

Well ss is used for mountain biking, but we're talking about a pretty different deal then. They run very low gears that are useless on the flat.
70-75 gear inches on a singlespeed or a fixie should get you over most moderate hills and will still be good on the flats, this is what I usually run.
I used to ride all around madrid on a fixed gear. Madrid is very hilly. I now live in sydney. I work on a singlespeed and sydney is also very hilly, the hills aren't as big as madrid's, but theres a lot of them. I'm pretty sure I could work all day on a fixie, I'm just not in the mood for it at the moment.