Originally Posted by
Rick@OCRR
...but pls. be advised that there is no cable tension adjustment on the mountain rear derailluer (this function is covered by the mountain shifters in that context)...
Rick / OCRR
I ran into that problem when setting up a bike! While short cage is great and all, I have found that I prefer medium cage mountain derailleurs. The trick is to make sure they are Top Normal (meaning when the cable goes slack, they shift via spring tension to the smallest cog) and have a barrel adjuster! There are a couple of Shimano LX's that I've found that work just great.