Full X-SYNC for best-ever inboard and outboard shifting performance under load with optimized gear steps on low end55mm chainline compatibility for more moderate chain angle, longer wear and greater precisionUtilizes X-DOME for gears 1-11, with a lighter-weight aluminum 12th gearFully E-MTB approved10-52t12sp10,12,14,16,18,21,24,28,32,38,44,52Black376gXDUPC/EAN/GTIN: 710845891458