SRAM 34T DIRECT 6mm BLACK 12s GXP/BB30Newly redesigned X Sync 2 provides better chain retention resulting in a smoother, more efficient pedal feel New aggressive tooth profile reduces friction and debris build up for superior longevity Robust forged and machined aluminum for ultimate strength Designed to pair flawlessly with the Eagle chain Compatible with all Sram Eagle 12 speed and Sram 11 speed 1x drivetrains