How do I size a chain for a 1x SRAM eTap AXS drivetrain? November 04, 2020 20:03 Updated Big chainring and big cog + two inner and two outer links. Related articles How do I size a chain for a 1x SRAM Eagle AXS™ drivetrain? How do I size a chain for a 2x SRAM eTap AXS drivetrain? Is a special chain tool required for new RED and Force eTap AXS™ road chains? Why is my SRAM Force eTap AXS drivetrain noisy, especially the cassette? Is a special cassette tool required to install or remove SRAM RED and Force eTap AXS™ road cassettes? Comments 0 comments Article is closed for comments.