Campy makes a bigger rear - the SGS (?) has about another inch of cage, looks like. I spent some time today taking that crank apart and putting it back together. I went spelunking in my "never use these again" drawer, and found a 74mm bcd 26 tooth Specialized granny cog (new and unused! I guess I've always been a hoarder.) I think that I could run a 12-25 rear cluster and, paired with that granny gear, I would almost have regular road bike gearing and a 1:1 low gear. I am guessing that I'll be able to use the biggest four rear cogs with the 26 tooth inner, so I could have the luxury of shifting a little bit on the climbs.

That's the plan. Come on, bottom bracket guy!