Drawing on a decade of Eagle drivetrain expertise, the Eagle S100 derailleur brings a refined design with an improved bushing fitment process for enhanced long-term durability and precision. True to the Eagle promise of accurate, purposeful shifting, the S100 delivers a high-performing 500% range derailleur engineered to thrive under high-torque demands, in any conditions, for any rider. Features Mounting bolt is Half Mount ready. Pair with a UDH and Half Mount plate for increased derailleur hanger security Utilizes proven Drag Spring cage damper for confident chain retention Max 500-percent range for pairing with PG1210 cassette X-Actuation for use with Eagle Drivetrain shifters Specs Model ID: RD-S100-B1 Shift Technology: X-Actuation Chain Technology: Eagle Max Tooth: 50t Drive Config: 1x Cage Material: Steel Compatibility SRAM Eagle S-Series, including the S100, S200, and S500, are built to work seamlessly with previous generation SRAM Eagle 12-speed components (SX, NX, GX, X01, XX1), offering backward compatibility with your existing drivetrain S-Series components are not compatible with SRAM Transmission (T-Type)