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@BareNecessities
This monster!
http://www.29ercafe.com/2012/07/sram-xx1-mountain-bike-drivetrain/sram-xx1-rear-derailleur-at-29er-cafe/
http://richardcunningham.pinkbike.com/blog/SRAM-XX1-One-by-Eleven-Drivetrain-First-Look.html