Occupying a new realm in shifting performance, the redesigned XX1 Eagleâ„¢ derailleur gives no-compromise racers and dream-bike builders a true top-tier option. The crisp, precise XX1â„¢ shifting feel athletes rely on now features an updated cage geometry for improved chain management. Occupying its rightful place at the top of the Eagleâ„¢ ecosystem, the XX1 Eagleâ„¢ rear derailleur makes full use of the new 10-52t cassettes and is backwards compatible to also work with the 10-50t.