Is your cog 1/8 as well. The only time I've thrown chains is when I was running a 1/8 chain on a semi-worn 3/32 cog. A new 1/8 cog cleared it right up.
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I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC