If you're building or repairing a Rival AXS road drivetrain and need the rear derailleur — either as a replacement for a damaged unit or as the anchor of a new wireless build — this is it. The Rival AXS E1 from SRAM is the updated 12-speed road derailleur that handles all current SRAM AXS road cassettes, from the tight 10-28T up to the wide-range 10-36T, on either a 1x or 2x setup. It's the same wireless AXS shifting logic used across Force and Red, at the entry point of SRAM's electronic road lineup.

The E1 is not a UDH Full Mount derailleur — this is the traditional hanger-mount road version, so it bolts to a standard rear derailleur hanger like any road derailleur. That's the important distinction from the XPLR gravel derailleurs in the same family, which use SRAM's hangerless Full Mount interface. If your frame uses a standard hanger and you're running road cassettes topping out at 36T, this is the correct part.

Compatibility is straightforward within the SRAM AXS road ecosystem. It works with all SRAM road cassettes including 10-36T, and pairs with SRAM AXS batteries which are sold separately . Chain compatibility is Flattop E1 — so a Rival, Force, or Red E1 Flattop chain, not an 11-speed or Eagle chain. Shifters need to be SRAM AXS road (Rival, Force, or Red eTap AXS), and the whole system is configured through the SRAM AXS app for firmware updates, battery status, and shift customization.... Read More