Can I use the eTap AXS rear derailleur without the front derailleur to make a 1x drivetrain? November 13, 2020 14:38 Updated Yes. Related articles Is there a different eTap AXS rear derailleur for 2x and 1x drivetrains? Can I assemble a SRAM RED eTap 2x11 system with no front derailleur to create a 1x drivetrain? Will the system still work? What is the max cog size that is compatible with SRAM RED or Force eTap AXS™ rear derailleurs? Will the eTap AXS groupset function without a front derailleur? Will the Force 36t-max derailleur work without a front derailleur? Comments 0 comments Article is closed for comments.