I have similar observation on my new Propel Adv SL Disc 1 8070. I set the RD guide pulley 5mm from cassette, adjusted RD indexing at the 5th as suggested by manual.CallumRD1 wrote: ↑Fri Jun 08, 2018 6:21 pmIn my case it's the 4th cog, counting from largest down, i.e. the 22t on my 11-32. I do have the chain on the correct way, Shimano Ultegra 8050 FD and RD (mid cage but with a little b tension to clear the 32t cog), Shimano Ultegra 8000 compact crankset, Shimano Ultegra 6800 11-32 cassette, Shimano CN-HG701 Ultegra 11 speed chain. It is interesting that the noise is dependent on both the chainring and cog choice. I wonder if this has to do with both the chainring/cassette tooth profiles and the chain tension created by the rear derailleur. That could potentially help to explain why there is less noise in the small chainring than the big at a given road speed (less overall chain tension).
Edit: I'm on a Felt F3x cyclocross bike in size 57 cm which has a 430 mm chainstay length.
Chain is KMC SL while chainrings are R9100 5034.
I suspect the new cassette (mine is 1128) is noisier than the older models, plus the RD guide pulley profile and the RD tension also contributed to the noise. I'd just take it and regard as non-issue right now.
btw R8050 shifts swiftly and feel very solid, love it.