Here it goes...
I have spent most of this morning holding a wrenchfest in my living room trying to solve this problem. When I am either the big or middle ring up front, and any one of the smallest (outermost) 3 cogs in back, about every 3 to 4 revolutions, the chain rides up against cog above it and pops a little (it happens under load, and not although when it isn't under load it doesn't always pop, or pop hard). Also, I have noticed that when I shift to anyone of those last three cogs, it shifts pretty hard (harder than normal).
Any ideas as to what might be causing this? I have already checked the chain for stiff links and it is fine. I am running the same chain, rings and cassette that I have been running since new (and that has been less than a year of mildly aggressive XC, maybe 300 miles). Any help would be appreciated.
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