Shimano Ultegra R8100 2×11 22’S Road Bike Double Chainring 50-34T/52-36T No Bolt
Shimano Ultegra R8100 2×11 22 Speed Double Chainring 50-34T/52-36T. Shimano UT R8100 2×11 Speed Double Chainring. The chainrings are hollow to save weight and drastically improve stiffness and aerodynamics.