The 1x specific X-Horizon derailleur design provides excellent chain control and shifts well regardless of cassette size.

Roller bearing clutch and parallelogram design combine to minimize chain bounce, making the drive train safer and quieter over rough terrain
Not compatible with multiple chainring drive trains
Uses improved Type 3.0 roller clutch design
For use only with single chainring drivetrains

Specs

SRAM Rival 1 Rear Derailleur 11 Speed, Long Cage