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Dirty derailleur not moving as freely as it should? Also, top jockey wheel not floating and therefore failing to allow for any tiny errors in derailleur travel.
Are you using compressionless cable outer?
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Flimsy barrel adjusters somewhere in the system? Mine goes out over time because I use crap inline adjusters
Also check for play in the derailleur?
ffm
frankenbike
@Brookly_Bay
Indexing question!
My partners bike's gears repeatedly/frequently slip out of index, way quicker than they should, and I can't discover why. I have the same kit on my bike without any issues, so I know what I'm doing with the setup.
Within a week / a few short rides the indexing will be wildly out, to the extent it chatters away furiously / won't stay in any gear.
Any ideas?! We've changed cables, replaced chain and cassette (at same time), and had the hanger alignment checked. Also got a reputable shop to set it all up as was starting to think I must be doing something wrong, but same result a couple of days after collecting it.
Problem doesn't follow the usual rule either of "struggling to get onto bigger sprockets = more cable tension required and vice versa" - once the indexing starts going it isn't happy going up or down the cassette.