The 10-speed X-HORIZON rear derailleur makes shifting smooth and reliable no matter where you ride. Engineered to maintain consistent chain gap across all seven gears, X-HORIZON eliminates vertical movement for faster shifting, reduced shift force and an end to ghost shifting. ROLLER BEARING CLUTCH technology and the 12-tooth X-SYNC pulley wheels hold the chain in place, reducing bounce and chain slap. And CAGE LOCK technology makes wheel removal and installation easier than ever. Paired with the X01 DH 7-speed shifter, X-HORIZON forms the backbone of EXACT ACTUATIONÃƒÆ’Ã†â€™ Ã‚Â¢ Ã¢â‚¬Å¡Ã‚Â¬Ãƒâ€¦Ã‚Â¾ÃƒÆ’Ã¢â‚¬Å¡ Ã‚Â¢ technology and that means completely smooth shifting action.