Originally Posted by
McMitchell
...As I understand the idea behind 650B, one uses a smaller rim to achieve a taller tire that can be run at lower pressures and absorb more shock. Which makes me think they may work for my conditions? I believe these tires typically wind up narrower too, although I understand that depends on the tire. I ask because it seems more people use them for rougher conditions.
To clarify, most of the time 650b will be fatter and taller than a traditional 700c tire. It basically has more volume. The usual issue is that road bikes are limited by the height of the tire, especially if trying to also fit a fender so the smaller rim allows a taller tire. But, when thinking about a conversion you have to consider the ultimate width as well if you have a narrower fork.