Bought a Gen 3 Trek Checkpoint SL5 and quickly realized that I needed a mullet set-up. So the SRAM Apex AXS XPLR has got to go. The derailleur, cassette and chain saw about a 100 miles before I converted to a mullet set-up. You get the SRAM APEX AXS XPLR derailleur (no battery) 11-44 cassette (Shimano hg freehub compatible not included) and chain. I do have the original 40 tooth 1x crank and 165mm crank arms if you're interested. The crank arms have seen plenty of rock strikes.. $325