The brains of the operation. The Rival AXS rear derailleur is the choice for road riding, for all cassette sizes from 10-28T to 10-36T, for any terrain you cover. Precise wireless shifting with advanced chain management lets you ride with confidence anywhere. FEATURES: Chain management technology keeps the drivetrain quiet and secure AXS enabled for easy setup, personalization, and reliability Compatible with both 1x and 2x drivetrains Compatible with cassettes from 10-28T to 10-36T SPECS: Speed (RD): 12 Max tooth: 36 Color (RD): Black/Grey Pulley bearings material: Steel Cage material (RD): Aluminum Drivetrain Configuration: 2x Communication Protocol: AXS Shift Technology: Wireless Chain Technology: Road Flattop D1, Road Flattop E1