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The front derailleur (shimano st ct15 will shift down nicely thru each of the 3 chainrings....it shifts up from the smallest to the middle one nicely....but does not click in and make it back to the large ring withpout multiple efforts. I suspect this is an easy fix with a minor adjustment....and am looking for a little advice before I attempt it. I am not overly savvy with tuning derailleurs.

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