I wanted to find SOME way of determining the fit of the Fargo before I fell more in love - and being that I can't find a small version in driving distance to try - I contacted the Serotta fitting specialist at my LBS who did a body fit on Stella for me.
I didn't expect such a quick response - and I have included it below. Some of this has my head spinning when I read it - but I think the gist of it is that he things there is little chance the even the small Fargo will fit me... here is what he said:
"When I compare your fitting data with the geometry chart of the Fargo, I find several things. If we were building you a custom frame we would build it with a 50cm top tube (or as close as possible). The smallest Fargo frame (16") has a 54cm top tube. The custom (50cm) top tube assumes a 120mm length stem, so going with Fargo would require going all the way down to an 80mm stem. Stems that short can change the handling (i.e. steering response) of a bike.
Another concern is stand-over clearance, the Fargo requires a minimum 77cm inseam and your inseam is 78cm. That's very close. Usually, it's ideal to have at least 4-5cm clearance for a loaded touring bike, especially one with a sloping top tube. Less than that and dismounting the loaded bike can be positively dangerous.
Next is the seat tube angle. Your current bike has about a 75 degree angle and you require a very small 3mm setback of the saddle nose to the center of the bottom bracket. The steeper seat tube angle greatly simplifies moving the saddle that far forward. The Fargo has a very laid-back (by comparison) 73 degree seat tube angle. I don't know if we can even adjust your saddle far enough forward on a Fargo to optimally position your knees over the pedal axles."
There was more, and of course he suggested a custom built Serotta, as well as a Trek and Cannondale model. But it looks to me from reading this that I would be foolish to spend $1,700 on the Fargo...sigh :( I really wanted that bike...
Perhaps there is another steel frame bike out there that will take both road and mountain bike tires that WILL fit me? Back to research :)

