SRAM Force AXS D2 12 Speed - Rear DerailleurThe SRAM Force AXS rear derailleur features a single cage length that works with any cassette size from 10 28T to 10 36T, in 1x or 2x configurations. Shifts are fast and precise, and the Orbit fluid damper keeps the chain in control, whether the obstacle youre hitting is a pothole or a root. Wireless and proven eTap shift logic, AXS connectivity and advanced chain management mean this derailleur does exactly what you want when you need it. Orbit chain