Are Rival eTap AXS shift levers compatible with Eagle AXS rear derailleurs? Yes! For Mullet builds, AXS allows you to mix and match select AXS Road and AXS MTB components. Learn more about what this is all about in our article, SRAM AXS Mullet Build. Related articles Do I need an XD or XDR driver to use an XD compatible cassette? How long do eTap AXS shifter batteries last? What is the max rear tire width compatibility for Rival eTap AXS front derailleurs? Is there a 12-speed cassette with an 11-tooth start so I don’t have to change the 11-speed HG driver on my rear wheel to XDR? What chain should I use with the XPLR rear derailleur and cassette?