10% More Climbing Power that a 22T Chainring. Works with all Chains - 8,9,10,11 and 12 speed. Great for 2X drivetrains and 3X drivetrains. Works with Shimano, SRAM, Raceface, FSA, E13 and other MTB cranks. Perfect granny gear for: 8 speed 9 speed 10 speed 11 speed 12 speed Use along with Blackspire, Wolftooth, Absolute Black and other chainrings for 2X and 3X systems.