Can anybody tell me why a drive train will become "unidexed" after 5-10 miles?
I will index the rear derailleur and everything will run great for 5-10 miles, and then I will start getting skipping in 3rd - 5th gears (e.g., 1-3, 1-4, 1-5, 2-3, 2-4, 2-5, etc.) after about 10 miles. Many times I can tighten the derailleur and eliminate the problem on the trail, but 5-10 miles later the problem repeats and I solve it by loosening the cable a little.
My setup is with an X9 trigger shifter and an X0 read derailleur (both purchased within the last 1.5 years). I have tried replacing the cable, making sure the derailleur bolt is tight, replacing the hanger, adjusting for cable stretch, but none of these have worked long term. I can't figure out what the problem is, unless there is some incompatibility in the XO and X9 setup.
Could it be old cable housing or the fact my chain has two powerlinks side by side?
Any help would be appreciated. It is driving me nuts.
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