Jonny69
Senior Retro Guru
The long cage 105 derailleur will take a 34 no problem. If you’re set on sticking with the shorter cage Ultegra, however, I’d be looking to drop the smaller front ring from a 39 to a 34.
I’m also tempted to say if you don’t already have the new shifters and you’re thinking of getting another cassette anyway, to go straight to 10-speed. Wider range 9-speed are a bit gappy; 10-speed seems to be able to solve the gappiness.
I’m also tempted to say if you don’t already have the new shifters and you’re thinking of getting another cassette anyway, to go straight to 10-speed. Wider range 9-speed are a bit gappy; 10-speed seems to be able to solve the gappiness.