Wide range or tight steps? Why not both? SRAM's featherweight, bombproof Red CS-XG-1290-E1 12-speed cassette redefines the category with new 10-30T and 10-36T configurations. Each one-piece X-Dome unit features shift ramps tuned exclusively for the snap of electronic shifting, covering everything from racing 10-28T setups to adventure-ready 10-36T ranges. SRAM meticulously calculated every tooth jump to keep your legs in the sweet spot, whether you’re grinding up a 20% grade or fine-tuning your speed in the paceline.
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Features:
- Designed for smooth and fast shifting
- Gradual gear progression between cogs — at least five one-tooth jumps on 10-28T, 10-30T and 10-33T cassettes — while still offering a wider range
- 10-tooth start helps provide a wider gearing range
- 10-30T and 10-36T options available in RED for the first time
- Designed to work with an XDR driver body
- One-piece machined steel X-DOME design for weight savings
- Available in
- 10-28T Silver (00.2418.142.000)
- 10-30T Silver (00.2418.142.001)
- 10-33T Silver (00.2418.142.002)
- 10-36T Silver (00.2418.142.003)
- 10-28T Rainbow (00.2418.142.004)
- 10-30T Rainbow (00.2418.142.005)
- 10-33T Rainbow (00.2418.142.006)
- 10-36T Rainbow (00.2418.142.007)
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Specifications:
| Speed (CS) | 12 |
|---|---|
| Gearing | 10-28T, 10-30T, 10-33T, 10-36T |
| Cog finish (Cassette) | Rainbow, Silver |
| Technology (Cassette) | XG |
| 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 Configuration | 1x, 2x |
| Cassette Size (Max) | 28, 30, 33, 36 |
| Cassette Size (Min) | 10 |
| Chain Technology | Road Flattop D1, Road Flattop E1 |
| Rear Derailleur Mount | MTB, Road, Road L, UDH |
| Weight (g) | 180 |
| Weight Based On | XG1290 10-28 |