Quote Originally Posted by Triskeliongirl View Post
You could go 650b, but then the skinniest you can go is 34c. So if you want to be able to use tires in the 23c-32c range, you are better off with 700c.
I'm confused. What about these thinner 650B tires listed by Rivendell?:
http://www.rivbike.com/tires/models