Shimano Ultegra BB72-41B Press-Fit Bottom Bracket

This is the Ultegra-level version of Shimano's Hollowtech II Press Fit Bottom bracket. Just about every road frame now uses some version of a press-in bottom bracket. Framebuilders who adhere to Shimano's design use a road standard that fits 86.5mm wide BB shells with a 41mm internal diameter. The Dura-Ace level BB92-41B was already updated with smaller bearings for a smoother, lower resistance within the bearing race. and now Ultegra's BB 72-41B gets the same treatment. This Press Fit design is compatible with Shimano's Hollowtech 24mm spindle road cranksets. The high pressure resin body is stiff and designed to eliminate creaking when both BB and crankset are properly installed.