Shimano Ultegra FC-R8000 Crankset 46/36T 2x11-speed

Hollowglide
Hollow big chainring. The extremely rigid hollow structure reduces the weight with the same strength. Better power transmission and faster, more precise shifting at the front.

Hollowtech II
The Hollowtech technology allows extremely light, hollow crank arms manufactured using Shimano's exclusive forging technology to achieve maximum rigidity. In addition, on the Hollowtech II set, the right crank is firmly connected to the axle of the inner bearing, achieving an optimum balance between maximum rigidity and minimum weight. The externally mounted bottom bracket offers better weight distribution and more stability, which ensures more efficient power transmission. When developing the Ultegra R8000 Hollowtech II crankset, great importance was attached to an optimum ratio between rigidity and rotational efficiency as well as low weight and attractive appearance.