If you have a bike stand, what I do is to turn the bike upsidedown and let gravity help. Also you might want to check for a high spot in you chain ring. If out of round it will cause a tight spot and the rest will be slack.
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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