The sram gx eagle boost bb30 12 speed chainset the sram gx eagletrade crankset delivers consistent performance every time out featuring sramrsquos x synctrade2 tooth profile chainring the gx crankset is engineered for complete chain control each toothrsquos thickness is precisely toleranced and controlled to work seamlessly with the chainrsquos inner and outer links only eagle is a complete system engineered drivetrain designed tested and proven to deliver the lightest