I need to get a new rear derailleur for my wife's bike and I was looking at competitive cyclist and they have a good deal on a Shimano XT. Is it possible to just throw that on the bike even though it has full X7? If so is it worth it, or should I just get an X7?
Shimano XT Dyna-Sys RD-M781 Rear Derailleur - Competitive Cyclist
Bike Specs (it has an X7 front derailleur)
2011 X-Caliber WSD - Bike Archive - Trek Bicycle
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Thread: Which Rear Derailleur?