I was tired of looking at that XT rear derailleur on my bike but haven't found a XTR M900 yet. I decided to pull a M953 derailleur out of my parts bin and clean it up a bit. Can someone please explain this derailleur to me? It swings in the opposite direction of any other derailleur that I have ever used. Under full tension it puts the chain on the smallest cassette ring rather than the largest. Why is this? Will it cause me any problems?