SRAM XX1 QF 168 11 Speed Crankset BB30. One ring to rule them all surely applies to the SRAM XX1 BB30 11 speed crankset's lofty position in the realm of 1x11 speed drivetrains. While intended for freeride, many riders are tapping into XX1 for its simplicity and effectiveness from all mountain to cross country riding. Multiple chainring options items SR XX28, SR XX30, SR XX32, SR XX34, SR XX36, SR XX38 allow you to tune your gear range and match your terrain, wheel size and riding style chainring not included. Each X Sync chainring fits a single, universal spider, allowing you to change rings without removing the lightweight carbon crank arm. Besides serious weight savings, the BB30 bottom bracket means more ankle clearance, greater bearing durability and stronger crank construction.