I'm considering getting a bike for my friend; she is interested in riding road/gravel with me, doesn't own a bike of her own, and doesn't know too much about what's available.
She is about 5 feet tall (1.5 meters) and 100 pounds (45 kilos). I believe a 47-49cm frame would be a good fit for her. Considering her small stature and the small frame size I was thinking about a set of 650b wheels.
It seems there has been a trend of 650b fitted bikes recently and that the wheel size is slowly creeping back into the market. One of the advantages is that one can fit a wider, taller tire without worrying about clearance or modifying frame geometry. I got to thinking that outfitting her with a 650b wheel set might be a viable option with some advantages over a 700c wheel set.
My question is what are the advantages and disadvantages of fitting a petite rider with a 650b wheel set, in comparison to a 700c set. I'm especially interested in bike handling, tire fitting, and frame geometry implications and considerations.