The Carbon-Ti X-CarboRing Outer Chainring is a 4-arm chainring that is lighter than ever to fit in with your fastest bike. It is compatible with 12-speed Shimano Dura-Ace 9100 and Ultegra groupsets as well as Campagnolo 12-speed. It also works with all previous 11-speed cranks. CNC Machining and grade 5 titanium pins allow for the fastest and most precise shifting possible. A specific shape helps it operate at its best in all conditions Keep your setup lightweight and efficient with the Carbon-Ti X-CarboRing Chainring.