Since I don't have a Bianchi frame hanging around, I bought a complete bike. I ride a Surley Steamroller. I had it built up with a flip flop hub, but have yet to use the freewheel side in over a year of riding. I ride it to work most days, round town for errands, round the county for fitness and on dirt roads & easy trails just for fun.
As for gearing, I initially went with 39:17 ~60 gear inches, which was low enough to get up the hills on my usual training rides without too much extra work with the added benefit of forcing a faster and, eventually, smoother, cadence. I've since gone to 39:15 ~69 gear inches. Gear choice is a compromise between your normal flat gear, climbing gear and descending. A higher gear may be generally better for flats & descents, but a lower gear will be better for climbing and developing a smooth cadence.
If you're going to build up your Bianchi frame, make sure to consult the guru, Sheldon Brown
For conversion inspiration, take a look at www.fixedgeargallery.com



with FIXED GEAR bikes and pondering
if I should build one with an old Bianchi frame or buy one "off the shelf", or abandon the whole idea.
), but would probably need a low gear ratio for rolly to hilly -- if I even went this route.
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