Originally Posted by
rodscot
Last year I switched the drivetrain on my Scott CX Comp from 46/36 to 50/34 rings. It went fairly well but I do tend to get a bit of noise on the 3 small sprockets when on the small ring. Ok, I can avoid that, but it is annoying having it happen on the 2nd and 3rd smallest sprockets. Trying to compensate for this by adjusting the FD makes the largest 3 sprockets when in the big ring noisy. Once more, that is a bit of a pain.
So, I was wondering how much difference there would be between the FD-CX70 and FD-4600 derailleurs? Images make have them looking pretty similar, but I dod wonder if there was a slightly different shaped cage on the 4600 that would better suit the 50/34 rings?
The cassette is 11-32 10 speed.
And, if anyone wants to suggest an alternative to the FD-4600, I'd consider that.
The CX70 has a different shaped cage that is better optimized for a smaller large ring (46T), but otherwise is identical to the FD-4600 in function (assuming you have the bottom pull version). However that shouldn't affect the function of the FD when you're in the small ring at all, so I would be willing to bet that a better adjustment of the derailleur is needed. I assume you had to move it up the frame when you put on a big ring? Make sure the FD cage is correctly aligned.