SRAM XS1270 10-52 12s BLACK EAGLE T-TYPE SPLINEDT Type compatible, 10 52t 12 speed cassette Splined 8, 9, 10 Speed driver body compatible 55mm chainline compatibility for more moderate chain angle, longer wear and greater precision Approved for aluminum driver body use as well as steel on both MTB and E MTB applications Full X SYNC design for best ever inboard and outboard shifting performance under load Gears 8 12 are a replaceable cluster Unique black nickel chrome finish