SRAM, Rival XPLR eTap AXS, Rear Derailleur, Speed: 12

Wireless electronic eTap shift logic for intuitive shifting, easy setup, and reliability
1x specific for use with 10-44T XPLR and 10-36T cassettes
AXS enabled, allowing easy personalization
Chain management keeps the drivetrain quiet and secure
Larger X-SYNC pulleys for increased durability and efficiency
0.71 kilograms