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SRAM RED XG-1290 D1 12 Speed CassetteBrand : SRAMThe workhorse of X-Range™ gearing. The SRAM RED® XG-1290 cassette progresses fluidly and quickly through a wider range of gears. It’s specifically designed for wireless electronic shifting and the one-piece design offers you the best in weight savings.THINGS TO REMEMBERUpdated design for smoother and faster shiftingMore gradual gear progression between cogs—at least five one-tooth jumps—while still offering a wider range10-tooth start helps provide a wider gearing rangeDesigned to work with an XDR™ driver bodyOne-piece machined steel X-Dome™ design for weight savings