With my All-Rounder, which has similar clearances as the Atlantis  
(but mine is for 26" wheels despite being a 60 cm frame, being 13  
years old), the most difficult problem to overcome was not the cranks  
hitting the frame but the chainrings.  The chain stays angle out  
sharply from the BB and I had to play around with chainrings a lot go  
be able to have the Q factor low enough.  I like a Q of 140 mm, which  
used to be standard for Campy road cranks (and may still be so, but  
the last pair I bought were in 1999).  Road sized ring were right  
out; I settled on 48 x 34 on a set of old Ritchey cranks which I  
bought in 1994.  These are 110/74 triples without a granny ring  
installed.

I think the angles on the Atlantis, at least for the ones with 700C  
wheels, are even less forgiving than those on my All-Rounder.  There  
is no free lunch in bicycle frame design, and every benefit (in this  
case, really fat tires) comes with a cost (wide Q).

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