I am considering moving to a fs Flagstaff, but it's a L frame and I ride a M XC-604.
I have longer legs than normal for 5'10" so my seatpost is a 400mm and pretty far out of the frame and run a 110 stem. Based on the published geometry, I'm going up 1.6" in eff. top tube length, so I can go to a 70mm stem to counteract that if needed.
But...is the Flagstaff a decent frame? I haven't ridden it yet unfortunately. I have my 604 setup exactly the way I want it, just rebuilt the Reba on it and it's riding great plus have good BWW Pure wheels on it and hit ~27.5lbs.
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