The heart of the Ultegra R8000 is the HOLLOWTECH II crankset, which reduces weight without compromising stiffness. The elegantly designed crank arm, borrowed from Dura-Ace, is a tribute to the aesthetics of every bicycle. The new design also concerns the position of the crankset in relation to the rear cassette, providing more clearance between the frame and the guide teeth, resulting in a higher level of shifting performance for bikes with disc brakes. The crankset options include a standard gear ratio of 53/39T, semi-compact 52/36T, compact 50/34T, and Cyclocross-specific 46/36T.