SRAM Eagle 90 T-Type Rear Derailleur - 12-Speed, Long Cage, 52t Max, Full Mount, Aluminum Cage, Black/SilverThe Eagle 90 Transmission derailleur is the definitive answer to how good a cable actuated derailleur can be. It features an all new T Type cable actuation ratio to provide the most precise and crisp shifts every time. Utilizing the same Full Mount design as its electronic siblings, Eagle 90 is the strongest mechanical derailleur SRAM has ever produced. Not only is it robust, but the derailleur body features replaceable outer and inner parallelogram