Didn't realize Athena came in a triple. Here's the skinny: Daytona/Centaur and below use a 111mm symmetrical BB on the double. On a triple it's 115.5mm asymmetrical BB. Record/Chorus use a 102mm symmetrical BB on the double. On a triple it's a 111mm asymmetrical BB. The 111mm lower level symmetrical BB will give you spacing problems if you try to use it instead of the asymmetrical version.
Hope that helps. I'm thinking the Athena might use the Daytona/Centaur version seeing as Daytona replaced it.
The triple cranks below Chorus can use either a 111mm or 115.5mm spindle, depending on the seat tube diameter. With seat tubes over 28.6mm, the 115.5 is used to move the crank further to the right, producing a chainline of 47.5mm instead of 45mm. Neither would cause the little ring to hit a chainstay. The longer spindle is needed with the larger seat tubes to allow the FD to swing far enough to the left to make the shift to the little ring.