Can someone tell me if I'm crazy here. I like the idea about this bike and I'm considering building one up for my wife as she desperately needs a new ride.

Sizing opinion question: She's not the tallest, coming in at 5' 1". The sizes for this frame are up one from the Santa Cruz/Juliana bikes which means a Small AM 831 = a Medium SC. I'd typically go small but would one of these AM831 smalls work if built with 27.5 wheels rather than 29's?

Any advice appreciated & I realize going out and demoing some similar bikes would probably be the best way to answer this question, just wanted to get a few more opinions.