joejack951

What matters here (ok, it doesn't really matter but you know what I mean) is the chain rubbing on the derailleur. If using the trim position doesn't get you at least one more quiet gear combination then you are doing something wrong.

Please, before spending any more time on this, verify that you have your shift cable attached to the derailleur properly (see PDF below).

Second, if you haven't already, install an inline cable adjuster.

Third, lubricate the derailleur's pivot points and ensure if it moving fully between the two stop screws.

Fourth, start from the beginning following Shimano's adjustment procedure: https://si.shimano.com/pdfs/dm/DM-RAFD001-02-ENG.pdf

Report back once you've done all that and tell us how great your bike shifts and how quietly it operates in all gear combos

Witterings

Literally I've done all of this ..... including strangely enough oiling the pivot's in case it was that a few days ago and there was already an inline cable adjuster .... that's what I was using to adjust the cable when I noticed you only seem to be able to set it up so the trim works fully on either of the chainrings but not both.

I think I may just take it in somewhere as there's obviously something just not 100% with it ... alternatively run if for another few weeks as is and take it in for it's from new service.

HarborBandS

I took advantage of some nice weather this past weekend and road my 105 5800-equipped bike for the first time since seeing this thread. Could I get my chain to rub on anything by cross-chaining? I tried the biggest extremes on both front chainrings, and I couldn't manage to get any rubbing regardless of what I did. Did I just get lucky when setting this up? Er, I mean, are my skills just that good?

I am running a 50/39 front and 11-28t rear cassette. Is it possible that this combination makes a difference?

Another thought is that you might check your rear derailleur hanger alignment and your front derailleur position. Maybe even chain length. All of it affects the position of the chain in relation to the derailleurs.

Witterings

I think what pees me off about it most is I didn't realise there was the trim and I also didn't know it was recommended NOT to use the 3 smallest rings on the cassette when on the small chainring so I started messing with it thinking it wasn't set up right and so knowing the shop I bought it from are very professional it's probably me that's totally buggered it up

Hopefully I'll learn from the mistake