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@yoav
Just to clarify, you can fit a fixed sprocket to the freewheel side, the thread is the same, but you won't fit be able a locking so it can unscrew itself with back pressure on the pedals.
As to ratio, its a very personal thing. Try the ratios and see how it feels. I use 42 x 17 but live in a hilly area and use 2 brakes.