That's still messy. Can't just chuck an MTB derailleur in there. Cable pull is different. Shimano doesn't do 1:1.
Just get something like an M8000 cassette and a roadlink, get rid of FD and double and bob's your uncle.
I got an M8000 11-42t but on the tech page on Wolfteef it says not supported which is strange as the total capacity for the 105 RD 5800 GS is 37t. I guess it has to do with the derailleur messing with the spokes or something?
That's still messy. Can't just chuck an MTB derailleur in there. Cable pull is different. Shimano doesn't do 1:1.
Just get something like an M8000 cassette and a roadlink, get rid of FD and double and bob's your uncle.