Eagle range on a drop bar bike? Now that’s a party. The Apex Eagle rear derailleur quietly and quickly shifts across our 12-speed Eagle cassettes, while 1x-specific chain retention technology keeps the chain where it needs to be. It’s the best of our road and mountain bike innovations in one package. FEATURES: Compatible with 50T and 52T Eagle cassettes Works with 12-speed mechanical Apex and Eagle shifters Use with Eagle chain Roller Bearing Clutch controls chain tension for consistent shifting X-HORIZON straight parallelogram design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force Cage Lock technology makes for fast wheel changes or chain installation SPECS: Speed (RD): 12 Cable Pull Ratio: X-Actuation Cage (RD): n/a Max Tooth: 52 Color (RD): Black Pulley Bearings Material: Steel Cage Material (RD): Aluminum Drivetrain Configuration: 1x Communication Protocol: n/a Shift Technology: X-Actuation Chain Technology: Eagle