Bringing you the same styling and efficiency as the higher-spec Dura-Ace model, the Shimano Ultegra R8000 Chainset delivers optimised power transfer without weighing your road bike down. Tuned for performance, it makes the most of every rotation. Top Features: Speed: 2×11-Speed Crank Construction: Hollowtech II (24mm spindle) Chainline: 43.5mm Bolt Circle Diameter (BCD): 4x110mm asymmetric Bottom Bracket Included: No Complete chainset – chainring and both crank arms included Redesigned crank arms for greater frame compatibility Lightweight crankarm design optimised for power-transfer efficiency Average Weight : 690g (53/39T), 681g (52/36T), 674g (50/34T), 668g (46/36T) Product Data Bottom Bracket Type: All No. Of Chainrings: Double Chainset type: Double Speed: 11 Speed Road: Yes.