Sram: The workhorse of X-Range gearing. The SRAM RED XG-1290 cassette progresses fluidly and quickly through a wider range of gears. Its 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 cogsat least five one-tooth jumpswhile 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 savingsAll Zipp wheels starting from 2012 are XDR ready SPECIFICATIONSSpeed (CS): 12sGearing: 10-26t, 10-28t, 10-33tCog finish (Cassette): SilverTechnology (Cassette): XGCog sizes: 10-26t; 10, 11, 12, 13, 14, 15, 16, 17, 19, 21, 23, 26, 10-28t; 10, 11, 12, 13, 14, 15, 16, 17, 19, 21, 24, 28, 10-33t; 10, 11, 12, 13, 14, 15, 17, 19, 21, 24, 28, 33
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