Full Mount is the story with the new E1-generation XPLR derailleurs, and SRAM's Rival XPLR AXS E1 13-Speed Rear Derailleur is where that architecture lands at the workhorse tier of the gravel lineup. Instead of hanging off a replaceable derailleur hanger, the derailleur attaches directly to frames with the UDH interface and centers on the rear axle for impact resistance. That's the same platform SRAM uses on Red and Force XPLR E1, without the carbon cage and top-tier machining that push the price up.

Removing hanger variances lets the derailleur shift without any adjustment screws — set it and forget it. Setup takes three steps, with no special tools or limit screws to dial in. If you've spent time chasing a bent hanger or fiddling with high and low limits after a rough ride, that's the practical benefit — the derailleur references the axle itself, so alignment stays true even after you clip a rock.

This is a 1x-specific derailleur built around one drivetrain and one drivetrain only. It pairs exclusively with SRAM's 10-46T XPLR cassette and Flattop chains , and it only works on frames with the UDH interface and only in 1x setups. It's also not compatible with SRAM T-Type Eagle chains , so if you're cross-shopping between XPLR and Eagle Transmission, this is the XPLR-only side of the fence.... Read More