Based on 10-years of experience with Eagle drivetrain, Eagle S100 delivers a modernized derailleur with improved bushing fitment process for long term durability and precision. Available in two versions: standard mount bolt for all derailleur hangers, or our all-new Half Mount variant for UDH equipped bikes. The Half Mount interfaces with the UDH bolt to bring a Transmission-like appearance while keeping the hanger straighter and more ready for the trail. Eagle is a promise of accurate and purposeful shifting, and S100 delivers a high performing derailleur built to excel in high-torque use, in all conditions, for all riders.