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Rear mech not holding indexing

SportivemanSportiveman Posts: 157
edited June 2017 in The workshop
Hi all,
I have just replaced my chainset and had to redo front mech shifting now works smoothly. But rear shifting wasn't as good as it should be so decided to try to reindex the rear gears. I watched some videos on how to do it I get it to index fine bit when gone from smallest sprocket to biggest then go back down it goes back to being out of index again ? I have it working but skips two gears on some sprockets . Any ideas what is causing this ? It is a full 5700 group set with a 6700 chainset and Tiagra cassette and chain is new cassette is failt new to.

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