First fixed at 48, just turned 49. Used an old '71 Schwinn Super Sport. Funny thing is that it feels faster than the 2010 Trek 7.3 I bought last year on a promotional deal. Now the Schwinn is my favorite bike (once again). Not sure why it rides so much faster, but I'm not complaining. The Trek feels clunky and stiff. The SS is setup with 63 (fixed) / 71 (single speed) gear inches with the flip flop hub to get the feel for what I am going to like.
Do not want to push to much gearage due to the deteriation under my right knee's patella, but biking really takes care of my knee pain. I use to have knee pain so bad, no amount of pain killers would resolve it.
What kind of geometry, bike speaking, is the Super Sport?
Tom