Six available chain rings 28 30 32 34 36 38 allow you to tune your gear range to match your terrain wheel size and riding style each x sync chainring fits a single universal spiderallowing you to change rings without removing the light weight carbon crank arm sram xx1 driven by a cutting edge single ring carbon crank and seamless component integration sram 1x drivetrain delivers flawless chain management and faster more precise shifting but the relationship between xx1 components go