'Unique' doesn't even begin to describe it.
Designed specifically for their single chainring MTB group, SRAM's XG-1199 cassette features an unprecedented 11-speed range from 10 to 42 teeth. But gearing aside, SRAM has also raised the bar by taking the machining featured in their PowerDome and X-Dome to new heights. With the exception of the largest cog, which is made of alloy, the entire body is made from a single piece of steel to decrease weight as well as flex. They have also optimized the gearing steps to ensure smooth shifting across the entire range.
The XX1 11-Speed Cassette is only compatible with wheels which use an XD driver (XX1 freehub body). It weighs 263 grams.
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