Originally Posted by
Kapusta
If you are running a double up front, you don't need a clutch RD in the back. No harm in using it, but it is not really needed.
Until it is...in my neighborhood there are some long sections of road that are "paved" with cobblestones. Even on a 2x, the clutch is critical. I can tell when I've forgotten to engage it. If nothing, it reaches chain slap, but on the right "road" it keeps the chain right where it belongs. On smooth road, I agree, it serves no purpose