Based on 10-years of experience, Eagle S100 delivers a modernized derailleur with improved bushing fitment process for long term durability and precisionMounting bolt is Half Mount ready - Pair with a UDH and Half Mount plate for increased derailleur hanger security (Sold Separately)S100 delivers a high performing derailleur built to excel in high-torque use, in all conditions, for all ridersUtilizes proven Drag Spring cage damper for confident chain retentionMax 500-percent range for pairing with PG1210 cassetteX-Actuation for use with Eagle Drivetrain shiftersS10012sp5040Long1to1BLKEagleUPC/EAN/GTIN: 710845928673