Sram NX X-Horizon 11s Long Cage Rear Derailleur

The X-Horizon rear derailleur has the same functionality as the top-of-the-line XX1, it even has the Cage Lock system, so you can remove the wheel and chain more effectively. Like the cranks, it's 100% compatible with all other 1x SRAM drivetrains. Available only in long cage, it is made almost entirely of steel and allows a maximum cassette with 42 teeth