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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Converting to FG means solving the chainline problem. In short this usually means both trying to bring the bring the chainring in as tight as possible and then respacing/redishing the rear wheel as much as necessary to meet the chainline given by the chainring.
Therefore, pick the bike (or perhaps the crankset) that allows the most options for moving CL in. Chainrings that can be unbolted and shifted to the inside of the spider arms is good.
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...