SRAM Rear Derailleur Apex XPLR AXS D1 Max 44T 12-Speed Quiet and Quick Gravel riding can be rough, so you need components that won't hold you back. SRAM's XPLR line of derailleurs is ready to tackle the trails. The SRAM Apex XPLR AXS Rear Derailleur hits the sweet spot of smooth jumps over a big gear range all with the unmatched chain security and simplicity of a 1x drivetrain. It is compatible with cassettes with 36T or 44T large cogs, uses a flattop chain, has a clutch that controls the chain tension for consistent shifting, and is AXS enabled for easy setup, personalization, and reliability. Features Innovative and intuitive e Tap shift logic and AXS connectivity keeps the Apex distraction-free Compatible with 11-44T XPLR, 10-44T XPLR, and 10-36T cassettes Clutch controls chain tension for consistent shifting | Rockshox | Sram Rear Derailleur Apex Xplr Axs D1 Max 44T 12 Speed Xplr Axs D1 Max 44T(No Battery)