I'll get you a scan of Mrs Dee Hubbs' feet. I tried twice today, but the app won't let you do a scan if your phone is below 50% battery (weird).

Scan were accurate in my opinion. I have been in 27.5 100mm Lange RX130, RS130, 130 Freetour, and 130 Free since 2011/2012, all with Surefoot foam liners.
I have always felt I need the 27.5 size to...