SRAM S100 Eagle Rear Derailleur Fly Like an Eagle Based on 10 years of experience with the Eagle drivetrain, the S100 delivers a modernized rear derailleur with an improved bushing fitment process for long-term durability and precision. Eagle is a promise of accurate and purposeful shifting, and the S100 is a high-performing, 500% range derailleur built to excel in high-torque use, in all conditions, for all riders. Features Modernized bushing fitment process maintains precise operation over long-term use, even under demanding riding conditions Half Mount ready mounting bolt pairs with a UDH and Half Mount plate for increased derailleur hanger security (sold separately)Proven Drag Spring cage damper for confident chain retention and reduced chain slap on rough terrain X-Actuation for use with Eagle Drivetrain shifters Max 500% gear range for pairing with 11-50T or 10-50T Eagle cassettes Backward compatible with Eagle SX, NX, GX, X01, and XX1 Eco System SPECIFICATIONSIntended Use Trail, Enduro, E-MTBSpeed Compatibility12-speed Drivetrain Configuration1x Cage Type Long Max Cassette Size50TCable Pull/Shift Technology X-Actuation Cage/Pulley Material Steel Mount Standard or Half Mount (UDH) | Sram | S100 Eagle Rear Derailleur | Black | B1, 50T Max