Aero Road Bike Chainring 50-34T 52-36T 54-40T for Shimano Dura-Ace R9200 12Speed

Mounting position:Outside 50T\52T\54T;inside 34T\36T\40T. Optimum chainring combinations:50-34T\52-36\54-40T. RYET Premium Shimano 110/4 bcd compatible chainrings are designed for new type of Shimano cranks Dura-Ace 9100, Ultegra8100 & 105 7100.

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