Old 01-22-15 | 11:50 AM
  #18  
FBinNY
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From: New Rochelle, NY

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Originally Posted by ljsense
op says both the cogs and the chain are new, and the same thing happened on a different cog set that had low mileage
I missed the second "new".

Then it's probably a simple profile or stiff chain issue. Since it's only on a single sprocket, I'd see if I could live with long enough for break-in wear to fix it.
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