The heart of the connected cadre. The Sram Red eTap AXS™ rear derailleur is AXS enabled for easy personalization and designed for both 1x and 2x systems. Advanced chain management keeps it silent and secure no matter the terrain. The derailleur also comes with faster pulleys, bearings, motors and signals, improving speed in every way.   Features Sram AXS™ enabled for easy personalization. Orbit™ chain management technology keeps drivetrain quiet and secure. A single rear derailleur for all gearing combinations, including 1x and 2x. Improved motor and signal travel for faster shifting. Larger X-SYNC™ pulleys and ceramic bearings for increased durability and efficiency. Compatible with existing eTap® batteries. Battery sold separately.   Specification Speed: 12s. Cage: Short. Max tooth: 33. Pulley bearings material: Ceramic. Cage material: Carbon.