Top Swing - The clamp mount of the derailleur is at the bottom, then the moving pivot is on the top, call Top Swing, like XTR M970 is top swing
Bottom Swing - The clamp mount of the derailleur is on the top, then the moving pivot is at the bottom, call Bottom Swing, like XTR M971 is Bottom Swing
Top Pull - The cable routing is from frame top tube to derailleur.
Bottom Pull - The cable routing is from under BB to the derailleur.
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