This is all real good information. I did not realize that there were limits as to total ring difference and a maximum difference for the intermediate and large rings. It sounds like you need to decide what gearing you want first, and go from there.

And on a related note, are the early 90's 105 triple components relatively rare? I did some searching and I am not finding much of anything. I can find lots of octalink triple cranksets, but not many square spindle triple cranksets. And the ones I have found are not 170mm.

Jared