I'm having a bit of trouble with my rear mech.
I can index the bottom 4 or 5 cogs, but then it starts skipping/autoshifting when I get to the top 4 or 5. However, if I work the other way and index the top 4 or 5, it starts skipping/autoshifting on the bottom 4 or 5!
Seems I can only get use out of half the cassette.
Groupset is used, but all used together. 1x9 speed/XT/LX. Chainline is centred on the middle cogs on the cassette.