Wolf Tooth 110 BCD Cyclocross Road Chainring - 42t 110 BCD 5-Bolt Drop-Stop B Raw SilverDo NOT fit on Shimano DA 9000 Ultegra 6800 cranksets. Not compatible with Campy CX10 11 10, 11, & 12spd Eagle and Flattop compatible: these chainrings are designed to work with all 10 speed, and 11 speed chains. They also work with 12 speed SRAM Flattop, SRAM Eagle and KMC chains. They do not work with Shimano 12 speed Hyperglide+ chains Can be mounted in either the big or small ring position of a double crankset given chainstay clearance in the small