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Experience the pinnacle of performance with the SRAM Red XG-1290 E1 12-Speed Cassette. Designed to deliver smooth and rapid shifting, this cassette sets a new standard for gearing options. Offering four distinct cassette choices, including the revolutionary 10-30T and 10-36T configurations, each is meticulously crafted with precise shift ramps tailored for electronic shifting systems. Whether you're racing on the road or tackling diverse terrain, SRAM Red provides the versatility you need.Features:Engineered for seamless and efficient shifting performanceGradual gear progression between cogs ensures smooth transitions with at least five one-tooth jumps on 10-28T, 10-30T, and 10-33T cassettes10-tooth start provides an expanded gearing rangeIntroduction of 10-30T and 10-36T options in the Red series for the first timeCompatible with XDR driver bodiesOne-piece machined steel X-DOME design for optimal weight savingsAvailable in 10-28T, 10-30T, 10-33T, and 10-36T configurationsSpecifications:Speed: 12-speedGearing: 10-28/30/33/36tCog Finish: SilverTechnology: XGCog Sizes (10-36T): 10, 11, 12, 13, 15, 17, 19, 21, 24, 28/32/36Driver Body Interface: XDRElevate your cycling experience with the SRAM Red XG-1290 E1 12-Speed Cassette, delivering unmatched performance and versatility for every ride.