Rival eTAP AXS Rear Derailleur E1 – SRAM Rival AXS Rear Derailleur – 12-Speed,
Rear Der/Shifter Compatibility SRAM eTap AXS. MPN: 00.7518.196.000 – SRAM – Rival eTAP AXS Rear Derailleur E1 – Rear Derailleur. SRAM Rival AXS Rear Derailleur – 12-Speed, 36t Max, (Battery Not Included), Aluminum Cage, Black, E1.