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.
Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...