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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Certainly could be a funky chainline.
Also, the fg crowd is well-aware that cogs/rings/chains sometimes take a bit to wear in together. With a spring-loaded rear derailleur or tensioner, this grittiness seems to be soaked up by the spring. Without the spring, you feel every little bump down there.
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...