Originally Posted by
B1KE
Is that a matter of opinion or is that concrete the way it should be?
I'm seeing conflicing results here but from my limited understanding I think with running a double ring at the front an 10 gears on the back along with the Specialized Secteurs shorter top tube perhaps short is the way to go?
The RD-4600-SS is has ratings that would indicate that it should function with your setup at least as well as the original unit..
(I am choosing my words carefully.)
As for the 6s thru 10s interchangeability, I stand by my experience.
I have several bikes with 6s-9s rear derailleurs with 10 speed shifters and cassettes; I am not going to change them.
I have always been happy with their operations. But, of course, I set them up myself!