SRAM RED 12-Speed Cassette #CS-XG-1290-E1

Wide Range AND Tight Jumps — Why Not Both?

The SRAM RED CS-XG-1290-E1 cassette delivers the perfect balance of broad gearing range and race-ready tight jumps. As SRAM’s lightest and most durable cassette ever, it introduces expanded gearing options—including the first-ever RED 10-30T and 10-36T—while maintaining ultra-fast, precise shifting optimized for electronic drivetrains.

Whether you’re sprinting on a 10-28T or building an all-road setup with 10-36T, the cassette’s carefully tuned gear steps keep you in the right cadence—on steep climbs, during accelerations, and while holding a wheel at race pace.

FEATURES

Designed for ultra-smooth and lightning-fast electronic shifting

Refined gear progression with at least five one-tooth jumps on 10-28T / 10-30T / 10-33T options

10-tooth starting cog expands the overall gearing range

New RED-exclusive sizes: 10-30T and 10-36T

XDR driver body compatible

One-piece X-DOME machined steel structure for maximum stiffness and weight savings

Available in 10-28T, 10-30T, 10-33T, and 10-36T

SPECIFICATIONS

Speed: 12-speed

Available Gearing: 10-28T / 10-30T / 10-33T / 10-36T

Finish: Rainbow or Silver

Technology: XG (X-DOME one-piece machined design)

Cog Sizes

10–28T: 10, 11, 12, 13, 14, 15, 16, 17, 19, 21, 24, 28

10–30T: 10, 11, 12, 13, 14, 15, 17, 19, 21, 24, 27, 30

10–33T: 10, 11, 12, 13, 14, 15, 17, 19, 21, 24, 28, 33

10–36T: 10, 11, 12, 13, 15, 17, 19, 21, 24, 28, 32, 36

Drivetrain Compatibility: 1× and 2×

Cassette Range: Max 28T / 30T / 33T / 36T

Minimum Cog: 10T

Chain Compatibility: Road Flattop D1, Road Flattop E1

Rear Derailleur Compatibility: MTB, Road, Road L, UDH

Weight: 180 g (based on XG-1290 10-28T)