Six available chainrings 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 the x sync ring has been developed for maximum chain control with each tooths thickness being precisely cnc machined to support the chains inner and outer links perfectly sram xx1 driven by a cutting edge single ring carbon cra