My Tommasini has a 7 speed freewheel in the back. It originally came with a 13-23, which I swapped out for a 13-28. Why? Simple reason - I live on a pretty steep hill, and my front crank is a tight spaced 42-53 Campy Super Record. When I started riding again last year after a 2-decade layoff, when I got WAY out of shape as well as much older, and I couldn't get up the hill I live on with the original gearing my bike had, from back in the day when I was 20 years younger and over 50 pounds lighter. Since the whole bike is Campy Super Record, I didn't want to change out the crank to a compact, so my only other option for hill gearing was a bigger cog in the back. So I ride a 13-28 now, instead of a 13-23. And I'm back in much better shape, but I still prefer the wider spacing in the freewheel. The small gears are 2 tooth jumps, but the last couple few jumps are 3 and 4 tooth. 13-15-17-19-21-24-28.