Ok so we ordered my wife a Superlight 29er in a RXC29 build we are making it a 2x10 and just taking off the big ring and installing a bashguard and limiting the front derailleur.
I want to replace the rear derailleur with a midcage but not sure which one will be best on the Superlight, its Shimano and there are so many XT rear derailleur's to choose from. I have to be honest I don't have a clue what any of the diff numbers mean ie 780, 781, 786? I know GS is midcage and I think we want the clutch type to elminate some chain slap.
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