Shimano's Ultegra bottom bracket uses Pro Tour-proven technology for lighter weight and super smooth spinning, while still maintaining the same level of durability and stiffness. It's available in English, Italian, or Press Fit models. New seal construction for smoother rotation BB Shell Width (mm): 68 mm BB/Frame Interface: BB86 Bottom Bracket Shell I.D.: 41 Defined Color: Black Weight: 69 g Spindle Interface Type: Shimano Hollowtech II