Based on 10-years of experience with Eagle drivetrain S100 Eagle rear derailleur delivers a modernized derailleur with improved bushing fitment process for long term durability and precision. Eagle is a promise of accurate and purposeful shifting and S100 delivers a high performing 500% range derailleur built to excel in high-torque use in all conditions for all riders.Utilizes proven Drag Spring cage damper for confident chain retentionMax 500-percent range for pairing with 11-50t or 10-50t Eagle cassettes (sold separately)Derailleur hanger mount type (Can be mounted using a traditional type derailleur hanger or optional Half Mount with UDH hanger and half mount plate)Mounting bolt is Half Mount ready - Pair with a UDH and Half Mount plate for increased derailleur hanger security (UDH and Half Mount plate sold separately)X-Actuation for use with Eagle Drivetrain shiftersBackward compatible with Eagle SX NX GX X01 XX1 EcoSystemNOT Compatible with Eagle 70 90 or Eagle Transmission TECH SPECS table{border-collapse:collapse;width:100%;} td{text-align:left;padding:8px;font-weight:350;} tr:nth-child(even){background-color:#f2f2f2} th{background-color:#eb212e;color:white;text-align:left;padding:8px;} .desc .specs-heading{font-size:24px;font-weight:600;padding-top:35px;border-top:3px solid #f0f0f0;display:inline-block;border-bottom:4px solid #eb212e;width:142px;margin:0;} Largest Cog 50 Rear Der/Shifter Compatibility SRAM X-Actuation Rear Derailleur Mount Type 10x1 Standard Drivetrain Speeds 12 Chain Wrap Capacity (teeth) 40 Cage Length Long Color Black