ROTOR Bike Components - Now you can assemble your Shimano® Dura-Ace R9100 or Shimano® Ultegra R8000 cranks with the new ROTOR Q RINGS BCD110X4 and enjoy all the advantages of oval chainrings. #
Rotor Q rings Review - YouTube
Rotor Q-Ring Aero 4 Arm Shimano 9000/6800/5800 Chainring - Mantel