James, I would guess that the 21" frame might be too small for you. I'm 6'0" with a 31.5" inseam and am comfortable on a 21" 1997 Trek 750. If anything, the frame could be a hair larger for me. I'm not familiar with the Coda's geometry, but I would guess that a 34.5" inseam will be best on a 23" frame vs. a 21" one.