Ultegra 6800 chain ring on a Dura ace 9000 crankset. I wanted to save some money so I ordered ultegra 6800chain rings because you always read everything is interchangable between these systems.
Stronglight 2286554800 chain ring ultegra 110mm internal 39 teeth alu
SHIMANO ULTEGRA HOLLOWTECH II Road Crankset 2x11-speed | SHIMANO BIKE-EU