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HarmanMogul

Ultegra 6700 rear shifter starting to miss or fluff shifts, getting on a bit now and probably rather worn. I have a spare set of newish 105 (5700) shifters — has anyone successfully transplanted the 105 internals into the Ultegra body?

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pifko in reply to @HarmanMogul

Try a new chain first.
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dancing james in reply to @HarmanMogul

i'd check chain wear before following @pifko's suggestion

or check hanger alignment

both more likely to be the cause than the internals of the shifter
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edscoble in reply to @HarmanMogul

Did you replace the cable/trimmed housing?

Not uncommon for the cable to get frayed inside the Shimano shifters.

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