R9100 chainring and R8000 crankset
9100 Shimano chainrings will fit on all 4 bolt Dura Ace, Ultegra, 105 or Tiagra cranksets. It's only when fitting the older style chainrings (9000, 6800, 5800 or 4700) onto the new cranksets (9100, 8000, 7000) that you run into compatibility issues.