SRAM XX Downhill T-Type AXS Rear Derailleur - 7-Speed, 24t Max, (Battery Not Included), UDH Hangerless, Aluminum Cage,SRAM's strongest DH derailleur available. Period. Utilizing the SRAM Full Mount design, the XX DH Transmission Derailleur takes the same robust architecture as their other Transmission derailleurs and delivers an even more robust, DH focused design ready for World Cup start huts or the gnarliest freeride lines. And just like T Type, the derailleur and cassette are designed to work in lockstep using Cassette Mapping to deliver constant chain engagement