Lightweight front top swing low clamp band mount Dyna-Sys11 11-speed double MTB derailleur for smooth gear changesDown Pull design for use with bottom bracket cable routingReinforced light weight chain guide adds rigidity and improved responseWider pivot link increases torsional rigidityEasy access angled adjustment screws and clamp boltAngled inner chain guide tail for increased tyre clearanceDyna-Sys11 11-speed design - for use with Dyna-Sys11 11-speed MTB drivetrainsDeveloped specifically for double chainsets and frames with band on frame designComes with low band clamp and necessary shims for all band dimensionsSpecifically developed for 68 and 73 mm bottom bracket shells with a 48.8 mm chain line66-69 degree chainstay to seat tube angle range34-38 tooth outer ring compatible