Originally Posted by
NoControl
Yeah it looks like about 22mph @ 90 rpm, which for me is pretty good.
It looks like you kinda' answered your own question here. Or at least simplified the question.
Do you want to be able to get power to the pedals over 22mph? Myself, I like to poke along and don't place much importance on the nature of the stiffer gears. My set up has a 15.7 gear-inch low and a 103 high. If I downshift to the next largest sprocket on the cassette, I'm at 87.2. I think I could get by with that. I might only use that gear a handful of times a tour, but it would be weird not to have it.