I'm 6ft4 and running a 35mm stem!

 Thx! Woow, you're too tall. I am 6'1.3/4 and looking for Tr Suppressor (my Sj Fsr Evo slightly short for me, but XL is like a high fence with 520+ st) . But I can not choose between L and XL... Maybe L is right for me, because i ride flats.

 As i'm sure you've already read, all the new Transition's come up a lot longer than most frames so it's worth comparing your current reach measurement from your current frame with the Transition. Mine is 60mm longer than my previous large frame, so it may be that even a large will give you the extra length your after!