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Celerra Disk Pro Ultegra Di2 R8100. When developing the Ultegra R8100 series, Shimano took a holistic and 100 % performance-oriented approach, because great speed means great responsibility. Faster than ever before, the 12-speed road groupset scores with unparalleled control and comfort anytime and anywhere – whether in an everyman race, on the hunt for a personal best time or on a companionable ride.
The new Celerra Gen. 2 is stiff, light and fine-tuned to reduce vibration and dramatically improves aerodynamic performance so you can ride faster with less effort. Engineered for performance with aggressive race geometry, the new Celerra is on the next level with a fully integrated, one-piece bar & stem combo.
The revolutionary Di2 shifting system solves the challenges drivetrains present to the power-delivery equation in cycling. Di2 gives you instant, accurate, lighting-fast shifts the first and every time, at the push of a button. Even in the most extreme conditions, shifting is precise and controlled. You can change gear even under heavy load while climbing or accelerating. With Di2, you are in complete control.