SRAM

Red XG-1090 X-Dome Cassette

The original SRAM Red Cassette was an exceptional drivetrain component with only one downside: when installed on a deep carbon wheel or ridden amongst a group of riders on Red, it created a resounding cacophony that drowned out even the most concentrated thoughts. There was nothing inherently wrong with this cassette, known officially as the OG-1090. It was lightweight, it shifted crisply, and was resistant to wear over the course of prolonged use. But it was noisy due to its Powerdome construction, which acted like a phonograph that reverberated drivetrain clatter from the freehub and chain. And thus the new SRAM Red XG-1090 X-Dome Cassette was born.

In the new Powerdome X construction, the middle eight cogs on the new XG-1090 are machined from a single block of high-grade steel; a technique similar to that of their popular XG-1099 mountain cassette. The cassette is then finished with two carefully machined aluminum cogs. The largest cog has a machined backplate to increase strength and improve stiffness—a definite advantage if this is your punchy, last-resort climbing gear. The whole cassette requires a machining process so complex and precise that each piece takes around seventy minutes to produce. But the final product is more than worth the effort—it is a hollow, inspiring piece of engineering that is both stiff and exceptionally lightweight. And excess noise is effectively dissipated, leaving you with nothing but the smooth, crisp, and reliable shifting SRAM Red is best known for.

To further reduce noise, SRAM also fitted an elastomer StealthRing between each cog to engage, dampen, and thereby eliminate any excess chatter from the chain. The rings are shaped to mesh with SRAM's PC-1091R chain, and do not compromise power transfer.

Having been improved exactly where needed, the new SRAM Red XG-1090 X-Dome Cassette is a true upgrade to its predecessor while still remaining faithful to the SRAM Red pedigree that provides the lightest and arguably best-climbing gruppo on the market. For smooth and flawless shifting across SRAM's machined X-Glide cassette teeth, and to run a drivetrain perfectly optimized for quiet operation with the StealthRings, SRAM recommends using their PC 1091R Chain. The cassette also includes an anodized, laser-etched aluminum lockring.

The 11/23 includes: 11,12,13,14,15,16,17,19,21,23
The 11/25 includes: 11,12,13,14,15,17,19,21,23,25
The 11/26 includes: 11,12,13,14,15,17,19,21,23,26
The 11/28 includes: 11,12,13,14,15,17,19,22,25,28