Whoops, the crank and rest of drivetrain is OEM SLX M660 3X10 Dyna-Sys Crankset, not what I mention below.
I did not know where to really post this.. but I suspect here is better than the Trek manuf forum.
I have had this to my lbs who did not find the problem. But adjusted it as I had originally done to try to resolve the issue.. but did not. (Largest cog= lowest rear gear)
Originally if I was in the middle ring on the front and third largest cog on the rear.. everyhing was fine. Sometimes I would need to drop to the second largest ring.. but not often. What started to happen is when in the middle on the front and second largest on the rear, the chain would slip down to the smallest ring on the front and sometimes fall off on the inside. I would gear down for a hill and it would happen when under pressure or as things eased off.. near the top of the hill. This makes it difficult to keep your speed. Even though adjusted by the lbs it was still happening, and frustrating. Now this is happening even when in the middle cog and the third largest cog on the rear. Since this is the gear I use most it is making rides less enjoyable. I have only been for 2 or 3 rides since it was at the lbs last. I have been riding the bike since late April 2012. The chain is not stretched to my knowledge, they would have looked at that.. The center sprocket on the front is designed a little beefier to allow you run it mostly in the center. This issue seems to be hit and miss on flats trying to reproduce the issue. More miss that hit. Guaranteed to happen hitting a hill.
So has anyone else experienced this with Shimano Deore M552 10 Speed Triple Chainset 42/32/22.
It took 8 months to show up, I cannot see it being wear I am not that good of a rider. or ride more than maybe once or twice a week.
Hope there is some help out there.
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