Originally Posted by
Kapusta
Because it is SHIMANO MTB 10 SPEED!
It has NOTHING to do with the fact that it is Shadow. Shimano just happened to go with Shadow on all their MTB stuff when they went to 10 speed.
Your RD will work with ANY Shimano 10 speed MTB shifter.
Likewise, 9 speed shadow and non-shadow RDs are completely interchangeable.
The derailleur will not work with 6,7,8,9 speed shifters, yet all those shifters use the generic rear derailleurs.
The problem isn't the shifter (of course a 10sp shifter will only work with a 10sp cassette).
The problem is the rear derailleur has s different swing ratio.