I am thinking out loud here for my Bianchi...
Currently my Freewheel is 13-15-17-20-23-26, and my chain rings are 52/42.
Most of my riding (right now) is on the 52 & 17 (I prefer 52 & 18).
I won't ever use the 13, and more than likely wont use anything past 24. I don't do hills.
What I am thinking about doing is changing the 42 CR to a 48 to do half steps, and the FW to something like a 14-16-18-21-24 (5 speed)? Or a 14-16-18-20-22-24?
What do you think? Is there such a freewheel? Where am I thinking incorrect? Help? Input?