Originally Posted by
osco53
They do not lock,, they clutch
Clutch on,,more chain tension, say,,,four times more on average...
Clutch off,, no extra tension, clutch off is just like any other non clutched derailleur....
If it was LOCKED you could not down shift....
The New revised Shimano XT M8000 rear derailleur has an external clutch tension adjustment screw,, I am waiting patiently...
I know how a clutch derailleur works, unfortunately I don't know how to review my posts to make sure I got all of the quote tags in..
My main point was that he needs to make sure he doesn't already have a N/W chain ring before buying a new one, and that he may not need a clutch RD if his chain is the correct length.
I have ridden many miles of rocks, drops, and roots with only a N/W ring and correct chain length - no clutch needed.