evo.com | SRAM Rear Derailleurs > Embrace the inevitable: wireless shifting is here, and everything's just fine. The SRAM Rival AXS 12-Speed Rear Derailleur shifts better than anything before it, over and over and over again. Concerns about charging batteries or water ingress are dead-ends, so let them go. These derailleurs are dialed and foolproof, amazing tech that definitely fits into that "don't know how I lived without it" category. If you're missing your cables, you can add them to that old product shrine you made with rotary phones, VCR's, and inner tubes. Uses Existing SRAM Batteries Sold Separately eTap Get wireless shifting and advanced battery power management for the most intuitive and consistent shifting available. Roller Bearing Clutch(TM) Roller Bearing Clutch(TM) rear derailleurs deliver maximum drivetrain stability-even through the most punishing terrain. With Roller Bearing Clutch(TM) technology, derailleur bounce and chain slap are eliminated without sacrificing precision. AXS Wireless electronic eTap shift logic for intuitive shifting, easy personalization, and reliability. Compatible with AXS Controller Inboard shift. Outboard shift. Dropper. Yes, use one of the touchpoints to control your Reverb AXS seatpost. Using both SRAM and RockShox AXS controllers opens a world of new possibilities. | SRAM Rival AXS 12-Speed Rear Derailleur 2022 - Medium Cage