surly old man
Join Date: Sep 2006
Location: Carlisle, PA
Bikes: IRO Mark V, Karate Monkey half fat, Trek 620 IGH, Cannondale 26/24 MTB, Amp Research B3, and more.
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Three potential probs with a triple:
1. cosmetic. A crank can be a beautiful piece of metal. Unnecessary bumps and such would bother some people.
2. chainline. the two outer ring positions are likely farther outboard on a triple, and getting the chainline as in-board as possible is the name of the game in a conversion.
3. Rub on chainstay. If you bring the crank in by using a shorter spindle, you may find that the attachment points for the granny gear will hit the chainstay. Of course they can be ground off to avoid this issue.
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